共用方式為


ILGenerator.EmitWriteLine 方法

定義

Helper 函式,其使用不同的實值型別將呼叫發出至 WriteLine()

多載

EmitWriteLine(String)

發出 Microsoft Intermediate Language (MSIL),以字串呼叫 WriteLine

EmitWriteLine(FieldInfo)

發出以指定欄位呼叫 WriteLine 所需的 Microsoft Intermediate Language (MSIL)。

EmitWriteLine(LocalBuilder)

發出以指定本機變數呼叫 WriteLine 所需的 Microsoft 中繼語言 (MSIL)。

EmitWriteLine(String)

來源:
ILGenerator.cs
來源:
ILGenerator.cs
來源:
ILGenerator.cs

發出 Microsoft Intermediate Language (MSIL),以字串呼叫 WriteLine

public:
 virtual void EmitWriteLine(System::String ^ value);
public virtual void EmitWriteLine (string value);
abstract member EmitWriteLine : string -> unit
override this.EmitWriteLine : string -> unit
Public Overridable Sub EmitWriteLine (value As String)

參數

value
String

要列印的字串。

範例

下列程式代碼範例示範方法的內容使用方式, EmitWriteLine 以在動態方法中將字串寫入主控台。

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

備註

字串必須已經定義。

適用於

EmitWriteLine(FieldInfo)

來源:
ILGenerator.cs
來源:
ILGenerator.cs
來源:
ILGenerator.cs

發出以指定欄位呼叫 WriteLine 所需的 Microsoft Intermediate Language (MSIL)。

public:
 virtual void EmitWriteLine(System::Reflection::FieldInfo ^ fld);
public virtual void EmitWriteLine (System.Reflection.FieldInfo fld);
abstract member EmitWriteLine : System.Reflection.FieldInfo -> unit
override this.EmitWriteLine : System.Reflection.FieldInfo -> unit
Public Overridable Sub EmitWriteLine (fld As FieldInfo)

參數

fld
FieldInfo

欄位,其值要寫入主控台 (Console)。

例外狀況

沒有 WriteLine 方法的多載,這個方法接受指定欄位的型別。

fldnull

欄位的型別為 TypeBuilderEnumBuilder,不支援這些型別。

範例

下列程式代碼範例示範如何使用 EmitWriteLine 方法,在動態方法中將字串寫入主控台。

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

備註

的類型 fld 必須符合 方法多載的參數 Console.WriteLine 類型。

適用於

EmitWriteLine(LocalBuilder)

來源:
ILGenerator.cs
來源:
ILGenerator.cs
來源:
ILGenerator.cs

發出以指定本機變數呼叫 WriteLine 所需的 Microsoft 中繼語言 (MSIL)。

public:
 virtual void EmitWriteLine(System::Reflection::Emit::LocalBuilder ^ localBuilder);
public virtual void EmitWriteLine (System.Reflection.Emit.LocalBuilder localBuilder);
abstract member EmitWriteLine : System.Reflection.Emit.LocalBuilder -> unit
override this.EmitWriteLine : System.Reflection.Emit.LocalBuilder -> unit
Public Overridable Sub EmitWriteLine (localBuilder As LocalBuilder)

參數

localBuilder
LocalBuilder

要將其值寫入主控台的本機變數。

例外狀況

localBuilder 的類型是 TypeBuilderEnumBuilder (均不支援)。

-或-

沒有任何 WriteLine 的多載可接受 localBuilder 的類型。

localBuildernull

範例

下列程式代碼範例示範方法的內容使用方式, EmitWriteLine 以在動態方法中將字串寫入主控台。

using namespace System;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
Type^ CreateDynamicType()
{
   array<Type^>^ctorParams = {int::typeid,int::typeid};
   AppDomain^ myDomain = Thread::GetDomain();
   AssemblyName^ myAsmName = gcnew AssemblyName;
   myAsmName->Name = "MyDynamicAssembly";
   AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( myAsmName, AssemblyBuilderAccess::Run );
   ModuleBuilder^ pointModule = myAsmBuilder->DefineDynamicModule( "PointModule", "Point.dll" );
   TypeBuilder^ pointTypeBld = pointModule->DefineType( "Point", TypeAttributes::Public );
   FieldBuilder^ xField = pointTypeBld->DefineField( "x", int::typeid, FieldAttributes::Public );
   FieldBuilder^ yField = pointTypeBld->DefineField( "y", int::typeid, FieldAttributes::Public );
   Type^ objType = Type::GetType( "System.Object" );
   ConstructorInfo^ objCtor = objType->GetConstructor( gcnew array<Type^>(0) );
   ConstructorBuilder^ pointCtor = pointTypeBld->DefineConstructor( MethodAttributes::Public, CallingConventions::Standard, ctorParams );
   ILGenerator^ ctorIL = pointCtor->GetILGenerator();
   
   // First, you build the constructor.
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Call, objCtor );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_1 );
   ctorIL->Emit( OpCodes::Stfld, xField );
   ctorIL->Emit( OpCodes::Ldarg_0 );
   ctorIL->Emit( OpCodes::Ldarg_2 );
   ctorIL->Emit( OpCodes::Stfld, yField );
   ctorIL->Emit( OpCodes::Ret );
   
   //  Now, you'll build a method to output some information on the
   // inside your dynamic class. This method will have the following
   // definition in C#:
   //  public void WritePoint()
   MethodBuilder^ writeStrMthd = pointTypeBld->DefineMethod( "WritePoint", MethodAttributes::Public, void::typeid, nullptr );
   ILGenerator^ writeStrIL = writeStrMthd->GetILGenerator();
   
   // The below ILGenerator created demonstrates a few ways to create
   // String* output through STDIN.
   // ILGenerator::EmitWriteLine(String*) will generate a ldstr and a
   // call to WriteLine for you.
   writeStrIL->EmitWriteLine( "The value of this current instance is:" );
   
   // Here, you will do the hard work yourself. First, you need to create
   // the String* we will be passing and obtain the correct WriteLine overload
   // for said String*. In the below case, you are substituting in two values,
   // so the chosen overload is Console::WriteLine(String*, Object*, Object*).
   String^ inStr = "( {0}, {1})";
   array<Type^>^wlParams = {String::typeid,Object::typeid,Object::typeid};
   
   // We need the MethodInfo to pass into EmitCall later.
   MethodInfo^ writeLineMI = Console::typeid->GetMethod( "WriteLine", wlParams );
   
   // Push the String* with the substitutions onto the stack.
   // This is the first argument for WriteLine - the String* one.
   writeStrIL->Emit( OpCodes::Ldstr, inStr );
   
   // Since the second argument is an Object*, and it corresponds to
   // to the substitution for the value of our integer field, you
   // need to box that field to an Object*. First, push a reference
   // to the current instance, and then push the value stored in
   // field 'x'. We need the reference to the current instance (stored
   // in local argument index 0) so Ldfld can load from the correct
   // instance (this one).
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, xField );
   
   // Now, we execute the box opcode, which pops the value of field 'x',
   // returning a reference to the integer value boxed as an Object*.
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Atop the stack, you'll find our String* inStr, followed by a reference
   // to the boxed value of 'x'. Now, you need to likewise box field 'y'.
   writeStrIL->Emit( OpCodes::Ldarg_0 );
   writeStrIL->Emit( OpCodes::Ldfld, yField );
   writeStrIL->Emit( OpCodes::Box, int::typeid );
   
   // Now, you have all of the arguments for your call to
   // Console::WriteLine(String*, Object*, Object*) atop the stack:
   // the String* InStr, a reference to the boxed value of 'x', and
   // a reference to the boxed value of 'y'.
   // Call Console::WriteLine(String*, Object*, Object*) with EmitCall.
   writeStrIL->EmitCall( OpCodes::Call, writeLineMI, nullptr );
   
   // Lastly, EmitWriteLine can also output the value of a field
   // using the overload EmitWriteLine(FieldInfo).
   writeStrIL->EmitWriteLine( "The value of 'x' is:" );
   writeStrIL->EmitWriteLine( xField );
   writeStrIL->EmitWriteLine( "The value of 'y' is:" );
   writeStrIL->EmitWriteLine( yField );
   
   // Since we return no value (void), the ret opcode will not
   // return the top stack value.
   writeStrIL->Emit( OpCodes::Ret );
   return pointTypeBld->CreateType();
}

int main()
{
   array<Object^>^ctorParams = gcnew array<Object^>(2);
   Console::Write( "Enter a integer value for X: " );
   String^ myX = Console::ReadLine();
   Console::Write( "Enter a integer value for Y: " );
   String^ myY = Console::ReadLine();
   Console::WriteLine( "---" );
   ctorParams[ 0 ] = Convert::ToInt32( myX );
   ctorParams[ 1 ] = Convert::ToInt32( myY );
   Type^ ptType = CreateDynamicType();
   Object^ ptInstance = Activator::CreateInstance( ptType, ctorParams );
   ptType->InvokeMember( "WritePoint", BindingFlags::InvokeMethod, nullptr, ptInstance, gcnew array<Object^>(0) );
}

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;

class EmitWriteLineDemo {

   public static Type CreateDynamicType() {
       Type[] ctorParams = new Type[] {typeof(int),
                   typeof(int)};
    
       AppDomain myDomain = Thread.GetDomain();
       AssemblyName myAsmName = new AssemblyName();
       myAsmName.Name = "MyDynamicAssembly";

       AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
                      myAsmName,
                      AssemblyBuilderAccess.Run);

       ModuleBuilder pointModule = myAsmBuilder.DefineDynamicModule("PointModule",
                                    "Point.dll");

       TypeBuilder pointTypeBld = pointModule.DefineType("Point",
                                  TypeAttributes.Public);

       FieldBuilder xField = pointTypeBld.DefineField("x", typeof(int),
                                                      FieldAttributes.Public);
       FieldBuilder yField = pointTypeBld.DefineField("y", typeof(int),
                                                      FieldAttributes.Public);

       Type objType = Type.GetType("System.Object");
       ConstructorInfo objCtor = objType.GetConstructor(new Type[0]);

       ConstructorBuilder pointCtor = pointTypeBld.DefineConstructor(
                                   MethodAttributes.Public,
                                   CallingConventions.Standard,
                                   ctorParams);
       ILGenerator ctorIL = pointCtor.GetILGenerator();

       // First, you build the constructor.
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Call, objCtor);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_1);
       ctorIL.Emit(OpCodes.Stfld, xField);
       ctorIL.Emit(OpCodes.Ldarg_0);
       ctorIL.Emit(OpCodes.Ldarg_2);
       ctorIL.Emit(OpCodes.Stfld, yField);
       ctorIL.Emit(OpCodes.Ret);

       //  Now, you'll build a method to output some information on the
       // inside your dynamic class. This method will have the following
       // definition in C#:
    //  public void WritePoint()

       MethodBuilder writeStrMthd = pointTypeBld.DefineMethod(
                                     "WritePoint",
                             MethodAttributes.Public,
                                             typeof(void),
                                             null);

       ILGenerator writeStrIL = writeStrMthd.GetILGenerator();

       // The below ILGenerator created demonstrates a few ways to create
       // string output through STDIN.

       // ILGenerator.EmitWriteLine(string) will generate a ldstr and a
       // call to WriteLine for you.

       writeStrIL.EmitWriteLine("The value of this current instance is:");

       // Here, you will do the hard work yourself. First, you need to create
       // the string we will be passing and obtain the correct WriteLine overload
       // for said string. In the below case, you are substituting in two values,
       // so the chosen overload is Console.WriteLine(string, object, object).

       String inStr = "({0}, {1})";
       Type[] wlParams = new Type[] {typeof(string),
                     typeof(object),
                     typeof(object)};

       // We need the MethodInfo to pass into EmitCall later.

       MethodInfo writeLineMI = typeof(Console).GetMethod(
                            "WriteLine",
                        wlParams);

       // Push the string with the substitutions onto the stack.
       // This is the first argument for WriteLine - the string one.

       writeStrIL.Emit(OpCodes.Ldstr, inStr);

       // Since the second argument is an object, and it corresponds to
       // to the substitution for the value of our integer field, you
       // need to box that field to an object. First, push a reference
       // to the current instance, and then push the value stored in
       // field 'x'. We need the reference to the current instance (stored
       // in local argument index 0) so Ldfld can load from the correct
       // instance (this one).

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, xField);

       // Now, we execute the box opcode, which pops the value of field 'x',
       // returning a reference to the integer value boxed as an object.

       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Atop the stack, you'll find our string inStr, followed by a reference
       // to the boxed value of 'x'. Now, you need to likewise box field 'y'.

       writeStrIL.Emit(OpCodes.Ldarg_0);
       writeStrIL.Emit(OpCodes.Ldfld, yField);
       writeStrIL.Emit(OpCodes.Box, typeof(int));

       // Now, you have all of the arguments for your call to
       // Console.WriteLine(string, object, object) atop the stack:
       // the string InStr, a reference to the boxed value of 'x', and
       // a reference to the boxed value of 'y'.

       // Call Console.WriteLine(string, object, object) with EmitCall.

       writeStrIL.EmitCall(OpCodes.Call, writeLineMI, null);

       // Lastly, EmitWriteLine can also output the value of a field
       // using the overload EmitWriteLine(FieldInfo).

       writeStrIL.EmitWriteLine("The value of 'x' is:");
       writeStrIL.EmitWriteLine(xField);
       writeStrIL.EmitWriteLine("The value of 'y' is:");
       writeStrIL.EmitWriteLine(yField);

       // Since we return no value (void), the ret opcode will not
       // return the top stack value.

       writeStrIL.Emit(OpCodes.Ret);

       return pointTypeBld.CreateType();
   }

   public static void Main() {

      object[] ctorParams = new object[2];

      Console.Write("Enter a integer value for X: ");
      string myX = Console.ReadLine();
      Console.Write("Enter a integer value for Y: ");
      string myY = Console.ReadLine();

      Console.WriteLine("---");

      ctorParams[0] = Convert.ToInt32(myX);
      ctorParams[1] = Convert.ToInt32(myY);

      Type ptType = CreateDynamicType();

      object ptInstance = Activator.CreateInstance(ptType, ctorParams);
      ptType.InvokeMember("WritePoint",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]);
   }
}

Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

Class EmitWriteLineDemo
   
   
   Public Shared Function CreateDynamicType() As Type

      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      
      Dim myDomain As AppDomain = Thread.GetDomain()
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(myAsmName, AssemblyBuilderAccess.RunAndSave)
      
      Dim pointModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("PointModule", "Point.dll")
      
      Dim pointTypeBld As TypeBuilder = pointModule.DefineType("Point", _
                                   TypeAttributes.Public)
      
      Dim xField As FieldBuilder = pointTypeBld.DefineField("x", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      Dim yField As FieldBuilder = pointTypeBld.DefineField("y", _
                                GetType(Integer), _
                                FieldAttributes.Public)
      
      
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type(){})
      
      Dim pointCtor As ConstructorBuilder = pointTypeBld.DefineConstructor( _
                             MethodAttributes.Public, _
                             CallingConventions.Standard, _
                             ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      
      
      ' First, you build the constructor.

      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Call, objCtor)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_1)
      ctorIL.Emit(OpCodes.Stfld, xField)
      ctorIL.Emit(OpCodes.Ldarg_0)
      ctorIL.Emit(OpCodes.Ldarg_2)
      ctorIL.Emit(OpCodes.Stfld, yField)
      ctorIL.Emit(OpCodes.Ret)
      
      '  Now, you'll build a method to output some information on the
      ' inside your dynamic class. This method will have the following
      ' definition in C#:
      '  Public Sub WritePoint() 

      Dim writeStrMthd As MethodBuilder = pointTypeBld.DefineMethod("WritePoint", _
                                    MethodAttributes.Public, _
                                    Nothing, Nothing)
      
      Dim writeStrIL As ILGenerator = writeStrMthd.GetILGenerator()
      
      ' The below ILGenerator created demonstrates a few ways to create
      ' string output through STDIN. 
      ' ILGenerator.EmitWriteLine(string) will generate a ldstr and a 
      ' call to WriteLine for you.

      writeStrIL.EmitWriteLine("The value of this current instance is:")
      
      ' Here, you will do the hard work yourself. First, you need to create
      ' the string we will be passing and obtain the correct WriteLine overload
      ' for said string. In the below case, you are substituting in two values,
      ' so the chosen overload is Console.WriteLine(string, object, object).

      Dim inStr As [String] = "({0}, {1})"
      Dim wlParams() As Type = {GetType(String), GetType(Object), GetType(Object)}
      
      ' We need the MethodInfo to pass into EmitCall later.

      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Push the string with the substitutions onto the stack.
      ' This is the first argument for WriteLine - the string one. 

      writeStrIL.Emit(OpCodes.Ldstr, inStr)
      
      ' Since the second argument is an object, and it corresponds to
      ' to the substitution for the value of our integer field, you 
      ' need to box that field to an object. First, push a reference
      ' to the current instance, and then push the value stored in
      ' field 'x'. We need the reference to the current instance (stored
      ' in local argument index 0) so Ldfld can load from the correct
      ' instance (this one).

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, xField)
      
      ' Now, we execute the box opcode, which pops the value of field 'x',
      ' returning a reference to the integer value boxed as an object.

      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Atop the stack, you'll find our string inStr, followed by a reference
      ' to the boxed value of 'x'. Now, you need to likewise box field 'y'.

      writeStrIL.Emit(OpCodes.Ldarg_0)
      writeStrIL.Emit(OpCodes.Ldfld, yField)
      writeStrIL.Emit(OpCodes.Box, GetType(Integer))
      
      ' Now, you have all of the arguments for your call to
      ' Console.WriteLine(string, object, object) atop the stack:
      ' the string InStr, a reference to the boxed value of 'x', and
      ' a reference to the boxed value of 'y'.
      ' Call Console.WriteLine(string, object, object) with EmitCall.

      writeStrIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      ' Lastly, EmitWriteLine can also output the value of a field
      ' using the overload EmitWriteLine(FieldInfo).

      writeStrIL.EmitWriteLine("The value of 'x' is:")
      writeStrIL.EmitWriteLine(xField)
      writeStrIL.EmitWriteLine("The value of 'y' is:")
      writeStrIL.EmitWriteLine(yField)
      
      ' Since we return no value (void), the ret opcode will not
      ' return the top stack value.

      writeStrIL.Emit(OpCodes.Ret)
      
      Return pointTypeBld.CreateType()

   End Function 'CreateDynamicType
    
   
   Public Shared Sub Main()
      
      Dim ctorParams(1) As Object
      
      Console.Write("Enter a integer value for X: ")
      Dim myX As String = Console.ReadLine()
      Console.Write("Enter a integer value for Y: ")
      Dim myY As String = Console.ReadLine()
      
      Console.WriteLine("---")
      
      ctorParams(0) = Convert.ToInt32(myX)
      ctorParams(1) = Convert.ToInt32(myY)
      
      Dim ptType As Type = CreateDynamicType()

      Dim ptInstance As Object = Activator.CreateInstance(ptType, ctorParams)

      ptType.InvokeMember("WritePoint", _
              BindingFlags.InvokeMethod, _
              Nothing, ptInstance, Nothing)

   End Sub

End Class

備註

的類型 localBuilder 必須符合 方法多載的參數 Console.WriteLine 類型。

適用於