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AssemblyBuilder.Save Method

Saves this dynamic assembly to disk.

[Visual Basic]
Public Sub Save( _
   ByVal assemblyFileName As String _
)
[C#]
public void Save(
 string assemblyFileName
);
[C++]
public: void Save(
 String* assemblyFileName
);
[JScript]
public function Save(
   assemblyFileName : String
);

Parameters

assemblyFileName
The file name of the assembly.

Exceptions

Exception Type Condition
ArgumentException The length of assemblyFileName is 0.

-or-

There are two or more modules resource files in the assembly with the same name.

-or-

The target directory of the assembly is invalid.

-or-

assemblyFileName is not a simple file name (for example, has a directory or drive component) or more than unmanaged resource, including version information resource, was defined in this assembly.

-or-

The CultureInfo string in AssemblyCultureAttribute is not a valid string and DefineVersionInfoResource was called prior to calling this method.

ArgumentNullException assemblyFileName is a null reference (Nothing in Visual Basic).
InvalidOperationException This assembly has been saved before.

-or-

This assembly has access Run AssemblyBuilderAccess

IOException If any output error occurs during the save.
NotSupportedException If CreateType has not been called for any of the types in the modules of the assembly to be written to disk.
SecurityException The caller does not have the required permission.

Remarks

This method saves all non-transient dynamic modules defined in this dynamic assembly. Transient dynamic modules are not saved. The assembly file name can be the same as one of the module's name. If so, the assemby information is stored within that module. assemblyFileName can be different from the names of all of the modules contained within the assembly. If so, the assembly is stored as a standalone.

For each ResourceWriter obtained using DefineResource, this method writes the .resources file and calls Close to close the stream.

The assemblyFileName needs to be a simple file name without a drive or directory component. To create an assembly in a specific directory, use one of the DefineDynamicAssembly methods that takes a target directory argument.

Example

[Visual Basic, C#, C++] The following code sample creates a dynamic assembly and then persists it to a local disk using Save.

[Visual Basic] 
Imports System
Imports System.Text
Imports System.Threading
Imports System.Reflection
Imports System.Reflection.Emit

 _

' The Point class is the class we will reflect on and copy into our
' dynamic assembly. The public static function PointMain() will be used
' as our entry point.
'
' We are constructing the type seen here dynamically, and will write it
' out into a .exe file for later execution from the command-line.
' --- 
' Class Point
'    
'    Private x As Integer
'    Private y As Integer
'    
'    
'    Public Sub New(ix As Integer, iy As Integer)
'       
'       Me.x = ix
'       Me.y = iy
'    End Sub 'New
'     
'    
'    Public Function DotProduct(p As Point) As Integer
'       
'       Return Me.x * p.x + Me.y * p.y
'    End Function 'DotProduct
'     
'    
'    Public Shared Sub Main()
'       
'       Console.Write("Enter the 'x' value for point 1: ")
'       Dim x1 As Integer = Convert.ToInt32(Console.ReadLine())
'       
'       Console.Write("Enter the 'y' value for point 1: ")
'       Dim y1 As Integer = Convert.ToInt32(Console.ReadLine())
'       
'       Console.Write("Enter the 'x' value for point 2: ")
'       Dim x2 As Integer = Convert.ToInt32(Console.ReadLine())
'       
'       Console.Write("Enter the 'y' value for point 2: ")
'       Dim y2 As Integer = Convert.ToInt32(Console.ReadLine())
'       
'       Dim p1 As New Point(x1, y1)
'       Dim p2 As New Point(x2, y2)
'       
'       Console.WriteLine("({0}, {1}) . ({2}, {3}) = {4}.", x1, y1, x2, y2, p1.DotProduct(p2))
'    End Sub 'Main
' End Class 'Point 
' ---
Class AssemblyBuilderDemo
   
   
   Public Shared Function BuildDynAssembly() As Type
      
      Dim pointType As Type = Nothing
      
      Dim currentDom As AppDomain = Thread.GetDomain()
      
      Console.Write("Please enter a name for your new assembly: ")
      Dim asmFileNameBldr As New StringBuilder()
      asmFileNameBldr.Append(Console.ReadLine())
      asmFileNameBldr.Append(".exe")
      Dim asmFileName As String = asmFileNameBldr.ToString()
      
      Dim myAsmName As New AssemblyName()
      myAsmName.Name = "MyDynamicAssembly"
      
      Dim myAsmBldr As AssemblyBuilder = currentDom.DefineDynamicAssembly(myAsmName, _
                     AssemblyBuilderAccess.RunAndSave)
      
      ' We've created a dynamic assembly space - now, we need to create a module
      ' within it to reflect the type Point into.
      Dim myModuleBldr As ModuleBuilder = myAsmBldr.DefineDynamicModule(asmFileName, _
                                    asmFileName)
      
      Dim myTypeBldr As TypeBuilder = myModuleBldr.DefineType("Point")
      
      Dim xField As FieldBuilder = myTypeBldr.DefineField("x", GetType(Integer), _
                                  FieldAttributes.Private)
      Dim yField As FieldBuilder = myTypeBldr.DefineField("y", GetType(Integer), _
                               FieldAttributes.Private)
      
      ' Build the constructor.
      Dim objType As Type = Type.GetType("System.Object")
      Dim objCtor As ConstructorInfo = objType.GetConstructor(New Type() {})
      
      Dim ctorParams() As Type = {GetType(Integer), GetType(Integer)}
      Dim pointCtor As ConstructorBuilder = myTypeBldr.DefineConstructor( _
                        MethodAttributes.Public, _
                        CallingConventions.Standard, _
                        ctorParams)
      Dim ctorIL As ILGenerator = pointCtor.GetILGenerator()
      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)
      
      ' Build the DotProduct method.
      Console.WriteLine("Constructor built.")
      
      Dim pointDPBldr As MethodBuilder = myTypeBldr.DefineMethod("DotProduct", _
                                 MethodAttributes.Public, _
                                 GetType(Integer), _
                                 New Type(0) {myTypeBldr})
      
      Dim dpIL As ILGenerator = pointDPBldr.GetILGenerator()
      dpIL.Emit(OpCodes.Ldarg_0)
      dpIL.Emit(OpCodes.Ldfld, xField)
      dpIL.Emit(OpCodes.Ldarg_1)
      dpIL.Emit(OpCodes.Ldfld, xField)
      dpIL.Emit(OpCodes.Mul_Ovf_Un)
      dpIL.Emit(OpCodes.Ldarg_0)
      dpIL.Emit(OpCodes.Ldfld, yField)
      dpIL.Emit(OpCodes.Ldarg_1)
      dpIL.Emit(OpCodes.Ldfld, yField)
      dpIL.Emit(OpCodes.Mul_Ovf_Un)
      dpIL.Emit(OpCodes.Add_Ovf_Un)
      dpIL.Emit(OpCodes.Ret)
      
      ' Build the PointMain method.
      Console.WriteLine("DotProduct built.")
      
      Dim pointMainBldr As MethodBuilder = myTypeBldr.DefineMethod("PointMain", _
                              MethodAttributes.Public Or _
                              MethodAttributes.Static, _
                              Nothing, Nothing)
      pointMainBldr.InitLocals = True
      Dim pmIL As ILGenerator = pointMainBldr.GetILGenerator()
      
      ' We have four methods that we wish to call, and must represent as
      ' MethodInfo tokens:
      ' - Sub Console.WriteLine(string)
      ' - Function Console.ReadLine() As String
      ' - Function Convert.Int32(string) As Int
      ' - Sub Console.WriteLine(string, object[])

      Dim writeMI As MethodInfo = GetType(Console).GetMethod("Write", _
                               New Type(0) {GetType(String)}) 
                                     
      Dim readLineMI As MethodInfo = GetType(Console).GetMethod("ReadLine", _
                              New Type() {})
      Dim convertInt32MI As MethodInfo = GetType(Convert).GetMethod("ToInt32", _
                              New Type(0) {GetType(String)})
      Dim wlParams() As Type = {GetType(String), GetType(Object())}
      Dim writeLineMI As MethodInfo = GetType(Console).GetMethod("WriteLine", wlParams)
      
      ' Although we could just refer to the local variables by
      ' index (short ints for Ldloc/Stloc, bytes for LdLoc_S/Stloc_S),
      ' this time, we'll use LocalBuilders for clarity and to
      ' demonstrate their usage and syntax.

      Dim x1LB As LocalBuilder = pmIL.DeclareLocal(GetType(Integer))
      Dim y1LB As LocalBuilder = pmIL.DeclareLocal(GetType(Integer))
      Dim x2LB As LocalBuilder = pmIL.DeclareLocal(GetType(Integer))
      Dim y2LB As LocalBuilder = pmIL.DeclareLocal(GetType(Integer))
      Dim point1LB As LocalBuilder = pmIL.DeclareLocal(myTypeBldr)
      Dim point2LB As LocalBuilder = pmIL.DeclareLocal(myTypeBldr)
      Dim tempObjArrLB As LocalBuilder = pmIL.DeclareLocal(GetType(Object()))
      
      pmIL.Emit(OpCodes.Ldstr, "Enter the 'x' value for point 1: ")
      pmIL.EmitCall(OpCodes.Call, writeMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, readLineMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, convertInt32MI, Nothing)
      pmIL.Emit(OpCodes.Stloc, x1LB)
      
      pmIL.Emit(OpCodes.Ldstr, "Enter the 'y' value for point 1: ")
      pmIL.EmitCall(OpCodes.Call, writeMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, readLineMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, convertInt32MI, Nothing)
      pmIL.Emit(OpCodes.Stloc, y1LB)
      
      pmIL.Emit(OpCodes.Ldstr, "Enter the 'x' value for point 2: ")
      pmIL.EmitCall(OpCodes.Call, writeMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, readLineMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, convertInt32MI, Nothing)
      pmIL.Emit(OpCodes.Stloc, x2LB)
      
      pmIL.Emit(OpCodes.Ldstr, "Enter the 'y' value for point 2: ")
      pmIL.EmitCall(OpCodes.Call, writeMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, readLineMI, Nothing)
      pmIL.EmitCall(OpCodes.Call, convertInt32MI, Nothing)
      pmIL.Emit(OpCodes.Stloc, y2LB)
      
      pmIL.Emit(OpCodes.Ldloc, x1LB)
      pmIL.Emit(OpCodes.Ldloc, y1LB)
      pmIL.Emit(OpCodes.Newobj, pointCtor)
      pmIL.Emit(OpCodes.Stloc, point1LB)
      
      pmIL.Emit(OpCodes.Ldloc, x2LB)
      pmIL.Emit(OpCodes.Ldloc, y2LB)
      pmIL.Emit(OpCodes.Newobj, pointCtor)
      pmIL.Emit(OpCodes.Stloc, point2LB)
      
      pmIL.Emit(OpCodes.Ldstr, "({0}, {1}) . ({2}, {3}) = {4}.")
      pmIL.Emit(OpCodes.Ldc_I4_5)
      pmIL.Emit(OpCodes.Newarr, GetType([Object]))
      pmIL.Emit(OpCodes.Stloc, tempObjArrLB)
      
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.Emit(OpCodes.Ldc_I4_0)
      pmIL.Emit(OpCodes.Ldloc, x1LB)
      pmIL.Emit(OpCodes.Box, GetType(Integer))
      pmIL.Emit(OpCodes.Stelem_Ref)
      
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.Emit(OpCodes.Ldc_I4_1)
      pmIL.Emit(OpCodes.Ldloc, y1LB)
      pmIL.Emit(OpCodes.Box, GetType(Integer))
      pmIL.Emit(OpCodes.Stelem_Ref)
      
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.Emit(OpCodes.Ldc_I4_2)
      pmIL.Emit(OpCodes.Ldloc, x2LB)
      pmIL.Emit(OpCodes.Box, GetType(Integer))
      pmIL.Emit(OpCodes.Stelem_Ref)
      
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.Emit(OpCodes.Ldc_I4_3)
      pmIL.Emit(OpCodes.Ldloc, y2LB)
      pmIL.Emit(OpCodes.Box, GetType(Integer))
      pmIL.Emit(OpCodes.Stelem_Ref)
      
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.Emit(OpCodes.Ldc_I4_4)
      pmIL.Emit(OpCodes.Ldloc, point1LB)
      pmIL.Emit(OpCodes.Ldloc, point2LB)
      pmIL.EmitCall(OpCodes.Callvirt, pointDPBldr, Nothing)
      
      pmIL.Emit(OpCodes.Box, GetType(Integer))
      pmIL.Emit(OpCodes.Stelem_Ref)
      pmIL.Emit(OpCodes.Ldloc, tempObjArrLB)
      pmIL.EmitCall(OpCodes.Call, writeLineMI, Nothing)
      
      pmIL.Emit(OpCodes.Ret)
      
      Console.WriteLine("PointMain (entry point) built.")
      
      pointType = myTypeBldr.CreateType()
      
      Console.WriteLine("Type completed.")
      
      myAsmBldr.SetEntryPoint(pointMainBldr)
      
      myAsmBldr.Save(asmFileName)
      
      Console.WriteLine("Assembly saved as '{0}'.", asmFileName)
      Console.WriteLine("Type '{0}' at the prompt to run your new " + "dynamically generated dot product calculator.", asmFileName)
      
      ' After execution, this program will have generated and written to disk,
      ' in the directory you executed it from, a program named 
      ' <name_you_entered_here>.exe. You can run it by typing
      ' the name you gave it during execution, in the same directory where
      ' you executed this program.

      Return pointType

   End Function 'BuildDynAssembly
    
   
   Public Shared Sub Main()
      
      Dim myType As Type = BuildDynAssembly()
      Console.WriteLine("---")
      
      ' Let's invoke the type 'Point' created in our dynamic assembly. 
      Dim ptInstance As Object = Activator.CreateInstance(myType, New Object(1) {0, 0})
      
      myType.InvokeMember("PointMain", BindingFlags.InvokeMethod, _
              Nothing, ptInstance, New Object() {})

   End Sub 'Main

End Class 'AssemblyBuilderDemo






[C#] 

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

// The Point class is the class we will reflect on and copy into our
// dynamic assembly. The public static function PointMain() will be used
// as our entry point.
//
// We are constructing the type seen here dynamically, and will write it
// out into a .exe file for later execution from the command-line.
// --- 
// class Point {
//   
//   private int x;
//   private int y;
//
//   public Point(int ix, int iy) {
//
//       this.x = ix;
//        this.y = iy;
//
//   }
//
//   public int DotProduct (Point p) {
//   
//       return ((this.x * p.x) + (this.y * p.y));
//
//   }
//
//   public static void PointMain() {
//     
//     Console.Write("Enter the 'x' value for point 1: "); 
//     int x1 = Convert.ToInt32(Console.ReadLine());
//     
//     Console.Write("Enter the 'y' value for point 1: ");
//     int y1 = Convert.ToInt32(Console.ReadLine());
//
//     Console.Write("Enter the 'x' value for point 2: "); 
//     int x2 = Convert.ToInt32(Console.ReadLine());
//     
//     Console.Write("Enter the 'y' value for point 2: ");
//     int y2 = Convert.ToInt32(Console.ReadLine());
//
//     Point p1 = new Point(x1, y1);
//     Point p2 = new Point(x2, y2);
//
//     Console.WriteLine("({0}, {1}) . ({2}, {3}) = {4}.",
//               x1, y1, x2, y2, p1.DotProduct(p2));
//   
//   }
//
// }
// ---

class AssemblyBuilderDemo {

   public static Type BuildDynAssembly() {

        Type pointType = null;

        AppDomain currentDom = Thread.GetDomain();

    Console.Write("Please enter a name for your new assembly: ");
    StringBuilder asmFileNameBldr = new StringBuilder();
        asmFileNameBldr.Append(Console.ReadLine());
    asmFileNameBldr.Append(".exe");
    string asmFileName = asmFileNameBldr.ToString();    

        AssemblyName myAsmName = new AssemblyName();
    myAsmName.Name = "MyDynamicAssembly";

        AssemblyBuilder myAsmBldr = currentDom.DefineDynamicAssembly(
                           myAsmName,
                           AssemblyBuilderAccess.RunAndSave);

        // We've created a dynamic assembly space - now, we need to create a module
        // within it to reflect the type Point into.

    ModuleBuilder myModuleBldr = myAsmBldr.DefineDynamicModule(asmFileName,
                                       asmFileName);
      
    TypeBuilder myTypeBldr =  myModuleBldr.DefineType("Point");
    
        FieldBuilder xField = myTypeBldr.DefineField("x", typeof(int),
                                                     FieldAttributes.Private);
        FieldBuilder yField = myTypeBldr.DefineField("y", typeof(int), 
                                                     FieldAttributes.Private); 

        // Build the constructor.

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

        Type[] ctorParams = new Type[] {typeof(int), typeof(int)};
        ConstructorBuilder pointCtor = myTypeBldr.DefineConstructor(
                                   MethodAttributes.Public,
                                  CallingConventions.Standard,
                                  ctorParams);
        ILGenerator ctorIL = pointCtor.GetILGenerator();
        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);

    // Build the DotProduct method.

        Console.WriteLine("Constructor built.");

    MethodBuilder pointDPBldr = myTypeBldr.DefineMethod("DotProduct",
                                MethodAttributes.Public,
                                typeof(int),
                                new Type[] {myTypeBldr});
                               
    ILGenerator dpIL = pointDPBldr.GetILGenerator();
    dpIL.Emit(OpCodes.Ldarg_0);
    dpIL.Emit(OpCodes.Ldfld, xField);
    dpIL.Emit(OpCodes.Ldarg_1);
    dpIL.Emit(OpCodes.Ldfld, xField);
    dpIL.Emit(OpCodes.Mul_Ovf_Un);
    dpIL.Emit(OpCodes.Ldarg_0);
    dpIL.Emit(OpCodes.Ldfld, yField);
    dpIL.Emit(OpCodes.Ldarg_1);
    dpIL.Emit(OpCodes.Ldfld, yField);
    dpIL.Emit(OpCodes.Mul_Ovf_Un);
    dpIL.Emit(OpCodes.Add_Ovf_Un);
    dpIL.Emit(OpCodes.Ret);

      // Build the PointMain method.

        Console.WriteLine("DotProduct built.");

    MethodBuilder pointMainBldr = myTypeBldr.DefineMethod("PointMain",
                                MethodAttributes.Public |
                                MethodAttributes.Static,
                                typeof(void),
                                null);
        pointMainBldr.InitLocals = true;
    ILGenerator pmIL = pointMainBldr.GetILGenerator();

    // We have four methods that we wish to call, and must represent as
    // MethodInfo tokens:
    // - void Console.WriteLine(string)
    // - string Console.ReadLine()
    // - int Convert.Int32(string)
    // - void Console.WriteLine(string, object[])

    MethodInfo writeMI = typeof(Console).GetMethod(
                         "Write",
                         new Type[] {typeof(string)});
    MethodInfo readLineMI = typeof(Console).GetMethod(
                            "ReadLine",
                            new Type[0]);
    MethodInfo convertInt32MI = typeof(Convert).GetMethod(
                            "ToInt32",
                                new Type[] {typeof(string)});
    Type[] wlParams = new Type[] {typeof(string), typeof(object[])};
    MethodInfo writeLineMI = typeof(Console).GetMethod(
                         "WriteLine",
                         wlParams);

    // Although we could just refer to the local variables by
    // index (short ints for Ldloc/Stloc, bytes for LdLoc_S/Stloc_S),
    // this time, we'll use LocalBuilders for clarity and to
    // demonstrate their usage and syntax.

    LocalBuilder x1LB = pmIL.DeclareLocal(typeof(int));                
    LocalBuilder y1LB = pmIL.DeclareLocal(typeof(int));                
    LocalBuilder x2LB = pmIL.DeclareLocal(typeof(int));                
    LocalBuilder y2LB = pmIL.DeclareLocal(typeof(int));                
    LocalBuilder point1LB = pmIL.DeclareLocal(myTypeBldr);                
    LocalBuilder point2LB = pmIL.DeclareLocal(myTypeBldr);                
    LocalBuilder tempObjArrLB = pmIL.DeclareLocal(typeof(object[]));                

    pmIL.Emit(OpCodes.Ldstr, "Enter the 'x' value for point 1: ");    
    pmIL.EmitCall(OpCodes.Call, writeMI, null);
    pmIL.EmitCall(OpCodes.Call, readLineMI, null);
    pmIL.EmitCall(OpCodes.Call, convertInt32MI, null);
    pmIL.Emit(OpCodes.Stloc, x1LB);

    pmIL.Emit(OpCodes.Ldstr, "Enter the 'y' value for point 1: ");    
    pmIL.EmitCall(OpCodes.Call, writeMI, null);
    pmIL.EmitCall(OpCodes.Call, readLineMI, null);
    pmIL.EmitCall(OpCodes.Call, convertInt32MI, null);
    pmIL.Emit(OpCodes.Stloc, y1LB);

    pmIL.Emit(OpCodes.Ldstr, "Enter the 'x' value for point 2: ");    
    pmIL.EmitCall(OpCodes.Call, writeMI, null);
    pmIL.EmitCall(OpCodes.Call, readLineMI, null);
    pmIL.EmitCall(OpCodes.Call, convertInt32MI, null);
    pmIL.Emit(OpCodes.Stloc, x2LB);

    pmIL.Emit(OpCodes.Ldstr, "Enter the 'y' value for point 2: ");    
    pmIL.EmitCall(OpCodes.Call, writeMI, null);
    pmIL.EmitCall(OpCodes.Call, readLineMI, null);
    pmIL.EmitCall(OpCodes.Call, convertInt32MI, null);
    pmIL.Emit(OpCodes.Stloc, y2LB);

    pmIL.Emit(OpCodes.Ldloc, x1LB);
    pmIL.Emit(OpCodes.Ldloc, y1LB);
    pmIL.Emit(OpCodes.Newobj, pointCtor);
    pmIL.Emit(OpCodes.Stloc, point1LB);

    pmIL.Emit(OpCodes.Ldloc, x2LB);
    pmIL.Emit(OpCodes.Ldloc, y2LB);
    pmIL.Emit(OpCodes.Newobj, pointCtor);
    pmIL.Emit(OpCodes.Stloc, point2LB);

    pmIL.Emit(OpCodes.Ldstr, "({0}, {1}) . ({2}, {3}) = {4}.");
    pmIL.Emit(OpCodes.Ldc_I4_5);
    pmIL.Emit(OpCodes.Newarr, typeof(Object));
    pmIL.Emit(OpCodes.Stloc, tempObjArrLB);

    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.Emit(OpCodes.Ldc_I4_0);
    pmIL.Emit(OpCodes.Ldloc, x1LB);
    pmIL.Emit(OpCodes.Box, typeof(int));
    pmIL.Emit(OpCodes.Stelem_Ref);

    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.Emit(OpCodes.Ldc_I4_1);
    pmIL.Emit(OpCodes.Ldloc, y1LB);
    pmIL.Emit(OpCodes.Box, typeof(int));
    pmIL.Emit(OpCodes.Stelem_Ref);

    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.Emit(OpCodes.Ldc_I4_2);
    pmIL.Emit(OpCodes.Ldloc, x2LB);
    pmIL.Emit(OpCodes.Box, typeof(int));
    pmIL.Emit(OpCodes.Stelem_Ref);

    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.Emit(OpCodes.Ldc_I4_3);
    pmIL.Emit(OpCodes.Ldloc, y2LB);
    pmIL.Emit(OpCodes.Box, typeof(int));
    pmIL.Emit(OpCodes.Stelem_Ref);

    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.Emit(OpCodes.Ldc_I4_4);
    pmIL.Emit(OpCodes.Ldloc, point1LB);
    pmIL.Emit(OpCodes.Ldloc, point2LB);
    pmIL.EmitCall(OpCodes.Callvirt, pointDPBldr, null);

    pmIL.Emit(OpCodes.Box, typeof(int));
    pmIL.Emit(OpCodes.Stelem_Ref);
    pmIL.Emit(OpCodes.Ldloc, tempObjArrLB);
    pmIL.EmitCall(OpCodes.Call, writeLineMI, null);

    pmIL.Emit(OpCodes.Ret);

        Console.WriteLine("PointMain (entry point) built.");

        pointType = myTypeBldr.CreateType();

        Console.WriteLine("Type completed.");

    myAsmBldr.SetEntryPoint(pointMainBldr);

        myAsmBldr.Save(asmFileName);

        Console.WriteLine("Assembly saved as '{0}'.", asmFileName);
        Console.WriteLine("Type '{0}' at the prompt to run your new " +
                  "dynamically generated dot product calculator.",
               asmFileName);

    // After execution, this program will have generated and written to disk,
        // in the directory you executed it from, a program named 
    // <name_you_entered_here>.exe. You can run it by typing
    // the name you gave it during execution, in the same directory where
    // you executed this program.

    return pointType;
   
   }

   public static void Main() {

     Type myType = BuildDynAssembly(); 
     Console.WriteLine("---");

     // Let's invoke the type 'Point' created in our dynamic assembly. 
   
     object ptInstance = Activator.CreateInstance(myType, new object[] {0,0}); 
                          
     myType.InvokeMember("PointMain",
              BindingFlags.InvokeMethod,
              null,
              ptInstance,
              new object[0]); 

            
   }
}




[C++] 
#using <mscorlib.dll>

using namespace System;
using namespace System::Text;
using namespace System::Threading;
using namespace System::Reflection;
using namespace System::Reflection::Emit;

// The Point class is the class we will reflect on and copy into our
// dynamic assembly. The public static function PointMain() will be used
// as our entry point.
//
// We are constructing the type seen here dynamically, and will write it
// out into a .exe file for later execution from the command-line.
// ---
// __gc class Point {
// 
// private:
//    int  x;
//    int  y;
// 
// public:
//    Point(int ix, int iy) {
// 
//       this->x = ix;
//       this->y = iy;
// 
//    }
// 
//    int DotProduct (Point* p) {
// 
//       return ((this->x * p->x) + (this->y * p->y));
// 
//   }
// 
//    static void PointMain() {
// 
//       Console::Write(S"Enter the 'x' value for point 1: ");
//       int x1 = Convert::ToInt32(Console::ReadLine());
// 
//       Console::Write(S"Enter the 'y' value for point 1: ");
//       int y1 = Convert::ToInt32(Console::ReadLine());
// 
//       Console::Write(S"Enter the 'x' value for point 2: ");
//       int x2 = Convert::ToInt32(Console::ReadLine());
// 
//       Console::Write(S"Enter the 'y' value for point 2: ");
//       int y2 = Convert::ToInt32(Console::ReadLine());
// 
//       Point* p1 = new Point(x1, y1);
//       Point* p2 = new Point(x2, y2);
// 
//       Console::WriteLine(S"( {0}, {1}) . ( {2}, {3}) = {4}.",
//          __box(x1), __box(y1), __box(x2), __box(y2), p1->DotProduct(p2));
// 
//    }
// 
// };
// ---

Type* BuildDynAssembly() {

   Type* pointType = 0;

   AppDomain*  currentDom = Thread::GetDomain();

   Console::Write(S"Please enter a name for your new assembly: ");
   StringBuilder* asmFileNameBldr = new StringBuilder();
   asmFileNameBldr->Append(Console::ReadLine());
   asmFileNameBldr->Append(S".exe");
   String* asmFileName = asmFileNameBldr->ToString();

   AssemblyName* myAsmName = new AssemblyName();
   myAsmName->Name = S"MyDynamicAssembly";

   AssemblyBuilder*  myAsmBldr = currentDom->DefineDynamicAssembly(myAsmName,
      AssemblyBuilderAccess::RunAndSave);

   // We've created a dynamic assembly space - now, we need to create a module
   // within it to reflect the type Point into.

   ModuleBuilder*  myModuleBldr = myAsmBldr->DefineDynamicModule(asmFileName,
      asmFileName);

   TypeBuilder*  myTypeBldr =  myModuleBldr->DefineType(S"Point");

   FieldBuilder*  xField = myTypeBldr->DefineField(S"x", __typeof(int),
      FieldAttributes::Private);
   FieldBuilder*  yField = myTypeBldr->DefineField(S"y", __typeof(int),
      FieldAttributes::Private);

   // Build the constructor.

   Type*  objType = Type::GetType(S"System.Object");
   ConstructorInfo*  objCtor = objType->GetConstructor(new Type*[0]);

   Type* temp4 [] = {__typeof(int), __typeof(int)};
   Type* ctorParams[] = temp4;
   ConstructorBuilder*  pointCtor = myTypeBldr->DefineConstructor(MethodAttributes::Public,
      CallingConventions::Standard,
      ctorParams);
   ILGenerator*  ctorIL = pointCtor->GetILGenerator();
   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);

   // Build the DotProduct method.

   Console::WriteLine(S"Constructor built.");

   Type* temp0 [] = {myTypeBldr};
   MethodBuilder*  pointDPBldr = myTypeBldr->DefineMethod(S"DotProduct",
      MethodAttributes::Public,
      __typeof(int),
      temp0);

   ILGenerator*  dpIL = pointDPBldr->GetILGenerator();
   dpIL->Emit(OpCodes::Ldarg_0);
   dpIL->Emit(OpCodes::Ldfld, xField);
   dpIL->Emit(OpCodes::Ldarg_1);
   dpIL->Emit(OpCodes::Ldfld, xField);
   dpIL->Emit(OpCodes::Mul_Ovf_Un);
   dpIL->Emit(OpCodes::Ldarg_0);
   dpIL->Emit(OpCodes::Ldfld, yField);
   dpIL->Emit(OpCodes::Ldarg_1);
   dpIL->Emit(OpCodes::Ldfld, yField);
   dpIL->Emit(OpCodes::Mul_Ovf_Un);
   dpIL->Emit(OpCodes::Add_Ovf_Un);
   dpIL->Emit(OpCodes::Ret);

   // Build the PointMain method.

   Console::WriteLine(S"DotProduct built.");

   MethodBuilder*  pointMainBldr = myTypeBldr->DefineMethod(
      S"PointMain",
      static_cast<MethodAttributes>(MethodAttributes::Public | MethodAttributes::Static),
      __typeof(void),
      0);
   pointMainBldr->InitLocals = true;
   ILGenerator*  pmIL = pointMainBldr->GetILGenerator();

   // We have four methods that we wish to call, and must represent as
   // MethodInfo tokens:
   // - void Console::WriteLine(String*)
   // - String* Console::ReadLine()
   // - int Convert::Int32(String*)
   // - void Console::WriteLine(String*, Object*[])


   Type* temp1 [] = {__typeof(String)};
   MethodInfo*  writeMI = __typeof(Console)->GetMethod(S"Write", temp1);
   MethodInfo*  readLineMI = __typeof(Console)->GetMethod(S"ReadLine", new Type*[0]);
   Type* temp2 [] = {__typeof(String)};
   MethodInfo*  convertInt32MI = __typeof(Convert)->GetMethod(S"ToInt32", temp2);
   Type* temp5 [] = {__typeof(String), __typeof(Object*[])};
   Type* wlParams[] = temp5;
   MethodInfo*  writeLineMI = __typeof(Console)->GetMethod(S"WriteLine", wlParams);

   // Although we could just refer to the local variables by
   // index (short ints for Ldloc/Stloc, bytes for LdLoc_S/Stloc_S),
   // this time, we'll use LocalBuilders for clarity and to
   // demonstrate their usage and syntax.

   LocalBuilder*  x1LB = pmIL->DeclareLocal(__typeof(int));
   LocalBuilder*  y1LB = pmIL->DeclareLocal(__typeof(int));
   LocalBuilder*  x2LB = pmIL->DeclareLocal(__typeof(int));
   LocalBuilder*  y2LB = pmIL->DeclareLocal(__typeof(int));
   LocalBuilder*  point1LB = pmIL->DeclareLocal(myTypeBldr);
   LocalBuilder*  point2LB = pmIL->DeclareLocal(myTypeBldr);
   LocalBuilder*  tempObjArrLB = pmIL->DeclareLocal(__typeof(Object*[]));

   pmIL->Emit(OpCodes::Ldstr, S"Enter the 'x' value for point 1: ");
   pmIL->EmitCall(OpCodes::Call, writeMI, 0);
   pmIL->EmitCall(OpCodes::Call, readLineMI, 0);
   pmIL->EmitCall(OpCodes::Call, convertInt32MI, 0);
   pmIL->Emit(OpCodes::Stloc, x1LB);

   pmIL->Emit(OpCodes::Ldstr, S"Enter the 'y' value for point 1: ");
   pmIL->EmitCall(OpCodes::Call, writeMI, 0);
   pmIL->EmitCall(OpCodes::Call, readLineMI, 0);
   pmIL->EmitCall(OpCodes::Call, convertInt32MI, 0);
   pmIL->Emit(OpCodes::Stloc, y1LB);

   pmIL->Emit(OpCodes::Ldstr, S"Enter the 'x' value for point 2: ");
   pmIL->EmitCall(OpCodes::Call, writeMI, 0);
   pmIL->EmitCall(OpCodes::Call, readLineMI, 0);
   pmIL->EmitCall(OpCodes::Call, convertInt32MI, 0);
   pmIL->Emit(OpCodes::Stloc, x2LB);

   pmIL->Emit(OpCodes::Ldstr, S"Enter the 'y' value for point 2: ");
   pmIL->EmitCall(OpCodes::Call, writeMI, 0);
   pmIL->EmitCall(OpCodes::Call, readLineMI, 0);
   pmIL->EmitCall(OpCodes::Call, convertInt32MI, 0);
   pmIL->Emit(OpCodes::Stloc, y2LB);

   pmIL->Emit(OpCodes::Ldloc, x1LB);
   pmIL->Emit(OpCodes::Ldloc, y1LB);
   pmIL->Emit(OpCodes::Newobj, pointCtor);
   pmIL->Emit(OpCodes::Stloc, point1LB);

   pmIL->Emit(OpCodes::Ldloc, x2LB);
   pmIL->Emit(OpCodes::Ldloc, y2LB);
   pmIL->Emit(OpCodes::Newobj, pointCtor);
   pmIL->Emit(OpCodes::Stloc, point2LB);

   pmIL->Emit(OpCodes::Ldstr, S"( {0}, {1}) . ( {2}, {3}) = {4}.");
   pmIL->Emit(OpCodes::Ldc_I4_5);
   pmIL->Emit(OpCodes::Newarr, __typeof(Object));
   pmIL->Emit(OpCodes::Stloc, tempObjArrLB);

   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->Emit(OpCodes::Ldc_I4_0);
   pmIL->Emit(OpCodes::Ldloc, x1LB);
   pmIL->Emit(OpCodes::Box, __typeof(int));
   pmIL->Emit(OpCodes::Stelem_Ref);

   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->Emit(OpCodes::Ldc_I4_1);
   pmIL->Emit(OpCodes::Ldloc, y1LB);
   pmIL->Emit(OpCodes::Box, __typeof(int));
   pmIL->Emit(OpCodes::Stelem_Ref);

   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->Emit(OpCodes::Ldc_I4_2);
   pmIL->Emit(OpCodes::Ldloc, x2LB);
   pmIL->Emit(OpCodes::Box, __typeof(int));
   pmIL->Emit(OpCodes::Stelem_Ref);

   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->Emit(OpCodes::Ldc_I4_3);
   pmIL->Emit(OpCodes::Ldloc, y2LB);
   pmIL->Emit(OpCodes::Box, __typeof(int));
   pmIL->Emit(OpCodes::Stelem_Ref);

   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->Emit(OpCodes::Ldc_I4_4);
   pmIL->Emit(OpCodes::Ldloc, point1LB);
   pmIL->Emit(OpCodes::Ldloc, point2LB);
   pmIL->EmitCall(OpCodes::Callvirt, pointDPBldr, 0);

   pmIL->Emit(OpCodes::Box, __typeof(int));
   pmIL->Emit(OpCodes::Stelem_Ref);
   pmIL->Emit(OpCodes::Ldloc, tempObjArrLB);
   pmIL->EmitCall(OpCodes::Call, writeLineMI, 0);

   pmIL->Emit(OpCodes::Ret);

   Console::WriteLine(S"PointMain (entry point) built.");

   pointType = myTypeBldr->CreateType();

   Console::WriteLine(S"Type completed.");

   myAsmBldr->SetEntryPoint(pointMainBldr);

   myAsmBldr->Save(asmFileName);

   Console::WriteLine(S"Assembly saved as ' {0}'.", asmFileName);
   Console::WriteLine(S"Type ' {0}' at the prompt to run your new dynamically generated dot product calculator.",
      asmFileName);

   // After execution, this program will have generated and written to disk,
   // in the directory you executed it from, a program named
   // <name_you_entered_here>.exe. You can run it by typing
   // the name you gave it during execution, in the same directory where
   // you executed this program.

   return pointType;
}

int main() {

   Type*  myType = BuildDynAssembly();
   Console::WriteLine(S"---");

   // Let's invoke the type 'Point' created in our dynamic assembly.

   Object* temp3 [] = {0, 0};
   Object* ptInstance = Activator::CreateInstance(myType, temp3);

   myType->InvokeMember(S"PointMain",
      BindingFlags::InvokeMethod,
      0,
      ptInstance,
      new Object*[0]);
}

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

.NET Framework Security: 

See Also

AssemblyBuilder Class | AssemblyBuilder Members | System.Reflection.Emit Namespace

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© 2014 Microsoft