Imports System
Imports System.Reflection
Imports System.Reflection.Emit
Class DemoMethodBuilder
Public Shared Sub AddMethodDynamically(ByVal myTypeBld As TypeBuilder, _
ByVal mthdName As String, _
ByVal mthdParams() As Type, _
ByVal returnType As Type, _
ByVal mthdAction As String)
Dim myMthdBld As MethodBuilder = myTypeBld.DefineMethod(mthdName, _
MethodAttributes.Public Or MethodAttributes.Static, _
returnType, _
mthdParams)
Dim ILout As ILGenerator = myMthdBld.GetILGenerator()
Dim numParams As Integer = mthdParams.Length
Dim x As Byte
For x = 0 To numParams - 1
ILout.Emit(OpCodes.Ldarg_S, x)
Next x
If numParams > 1 Then
Dim y As Integer
For y = 0 To (numParams - 1) - 1
Select Case mthdAction
Case "A"
ILout.Emit(OpCodes.Add)
Case "M"
ILout.Emit(OpCodes.Mul)
Case Else
ILout.Emit(OpCodes.Add)
End Select
Next y
End If
ILout.Emit(OpCodes.Ret)
End Sub
Public Shared Sub Main()
Dim myDomain As AppDomain = AppDomain.CurrentDomain
Dim asmName As New AssemblyName()
asmName.Name = "MyDynamicAsm"
Dim myAsmBuilder As AssemblyBuilder = myDomain.DefineDynamicAssembly(asmName, _
AssemblyBuilderAccess.RunAndSave)
Dim myModule As ModuleBuilder = myAsmBuilder.DefineDynamicModule("MyDynamicAsm", _
"MyDynamicAsm.dll")
Dim myTypeBld As TypeBuilder = myModule.DefineType("MyDynamicType", TypeAttributes.Public)
' Get info from the user to build the method dynamically.
Console.WriteLine("Let's build a simple method dynamically!")
Console.WriteLine("Please enter a few numbers, separated by spaces.")
Dim inputNums As String = Console.ReadLine()
Console.Write("Do you want to [A]dd (default) or [M]ultiply these numbers? ")
Dim myMthdAction As String = Console.ReadLine().ToUpper()
Console.Write("Lastly, what do you want to name your new dynamic method? ")
Dim myMthdName As String = Console.ReadLine()
' Process inputNums into an array and create a corresponding Type array
Dim index As Integer = 0
Dim inputNumsList As String() = inputNums.Split()
Dim myMthdParams(inputNumsList.Length - 1) As Type
Dim inputValsList(inputNumsList.Length - 1) As Object
Dim inputNum As String
For Each inputNum In inputNumsList
inputValsList(index) = CType(Convert.ToInt32(inputNum), Object)
myMthdParams(index) = GetType(Integer)
index += 1
Next inputNum
' Now, call the method building method with the parameters, passing the
' TypeBuilder by reference.
AddMethodDynamically(myTypeBld, myMthdName, myMthdParams, GetType(Integer), myMthdAction)
Dim myType As Type = myTypeBld.CreateType()
Dim description as String
If myMthdAction = "M" Then
description = "multiplying"
Else
description = "adding"
End If
Console.WriteLine("---")
Console.WriteLine("The result of {0} the values is: {1}", _
description, _
myType.InvokeMember(myMthdName, _
BindingFlags.InvokeMethod _
Or BindingFlags.Public _
Or BindingFlags.Static, _
Nothing, _
Nothing, _
inputValsList))
Console.WriteLine("---")
' If you are interested in seeing the MSIL generated dynamically for the method
' your program generated, change to the directory where you ran the compiled
' code sample and type "ildasm MyDynamicAsm.dll" at the prompt. When the list
' of manifest contents appears, click on "MyDynamicType" and then on the name of
' of the method you provided during execution.
myAsmBuilder.Save("MyDynamicAsm.dll")
Dim myMthdInfo As MethodInfo = myType.GetMethod(myMthdName)
Console.WriteLine("Your Dynamic Method: {0};", myMthdInfo.ToString())
End Sub
End Class
using System;
using System.Reflection;
using System.Reflection.Emit;
class DemoMethodBuilder
{
public static void AddMethodDynamically (TypeBuilder myTypeBld,
string mthdName,
Type[] mthdParams,
Type returnType,
string mthdAction)
{
MethodBuilder myMthdBld = myTypeBld.DefineMethod(
mthdName,
MethodAttributes.Public |
MethodAttributes.Static,
returnType,
mthdParams);
ILGenerator ILout = myMthdBld.GetILGenerator();
int numParams = mthdParams.Length;
for (byte x=0; x < numParams; x++)
{
ILout.Emit(OpCodes.Ldarg_S, x);
}
if (numParams > 1)
{
for (int y=0; y<(numParams-1); y++)
{
switch (mthdAction)
{
case "A": ILout.Emit(OpCodes.Add);
break;
case "M": ILout.Emit(OpCodes.Mul);
break;
default: ILout.Emit(OpCodes.Add);
break;
}
}
}
ILout.Emit(OpCodes.Ret);
}
public static void Main()
{
AppDomain myDomain = AppDomain.CurrentDomain;
AssemblyName asmName = new AssemblyName();
asmName.Name = "MyDynamicAsm";
AssemblyBuilder myAsmBuilder = myDomain.DefineDynamicAssembly(
asmName,
AssemblyBuilderAccess.RunAndSave);
ModuleBuilder myModule = myAsmBuilder.DefineDynamicModule("MyDynamicAsm",
"MyDynamicAsm.dll");
TypeBuilder myTypeBld = myModule.DefineType("MyDynamicType",
TypeAttributes.Public);
// Get info from the user to build the method dynamically.
Console.WriteLine("Let's build a simple method dynamically!");
Console.WriteLine("Please enter a few numbers, separated by spaces.");
string inputNums = Console.ReadLine();
Console.Write("Do you want to [A]dd (default) or [M]ultiply these numbers? ");
string myMthdAction = Console.ReadLine().ToUpper();
Console.Write("Lastly, what do you want to name your new dynamic method? ");
string myMthdName = Console.ReadLine();
// Process inputNums into an array and create a corresponding Type array
int index = 0;
string[] inputNumsList = inputNums.Split();
Type[] myMthdParams = new Type[inputNumsList.Length];
object[] inputValsList = new object[inputNumsList.Length];
foreach (string inputNum in inputNumsList)
{
inputValsList[index] = (object)Convert.ToInt32(inputNum);
myMthdParams[index] = typeof(int);
index++;
}
// Now, call the method building method with the parameters, passing the
// TypeBuilder by reference.
AddMethodDynamically(myTypeBld,
myMthdName,
myMthdParams,
typeof(int),
myMthdAction);
Type myType = myTypeBld.CreateType();
Console.WriteLine("---");
Console.WriteLine("The result of {0} the inputted values is: {1}",
((myMthdAction == "M") ? "multiplying" : "adding"),
myType.InvokeMember(myMthdName,
BindingFlags.InvokeMethod | BindingFlags.Public |
BindingFlags.Static,
null,
null,
inputValsList));
Console.WriteLine("---");
// Let's take a look at the method we created.
// If you are interested in seeing the MSIL generated dynamically for the method
// your program generated, change to the directory where you ran the compiled
// code sample and type "ildasm MyDynamicAsm.dll" at the prompt. When the list
// of manifest contents appears, click on "MyDynamicType" and then on the name of
// of the method you provided during execution.
myAsmBuilder.Save("MyDynamicAsm.dll");
MethodInfo myMthdInfo = myType.GetMethod(myMthdName);
Console.WriteLine("Your Dynamic Method: {0};", myMthdInfo.ToString());
}
}
using namespace System;
using namespace System::Reflection;
using namespace System::Reflection::Emit;
void AddMethodDynamically( TypeBuilder^ myTypeBld,
String^ mthdName,
array<Type^>^ mthdParams,
Type^ returnType,
String^ mthdAction )
{
MethodBuilder^ myMthdBld = myTypeBld->DefineMethod( mthdName, static_cast<MethodAttributes>(MethodAttributes::Public | MethodAttributes::Static), returnType, mthdParams );
ILGenerator^ ILOut = myMthdBld->GetILGenerator();
int numParams = mthdParams->Length;
for ( Byte x = 0; x < numParams; x++ )
{
ILOut->Emit( OpCodes::Ldarg_S, x );
}
if ( numParams > 1 )
{
for ( int y = 0; y < (numParams - 1); y++ )
{
if ( mthdAction->Equals( "A" ) )
ILOut->Emit( OpCodes::Add );
else
if ( mthdAction->Equals( "M" ) )
ILOut->Emit( OpCodes::Mul );
else
ILOut->Emit( OpCodes::Add );
}
}
ILOut->Emit( OpCodes::Ret );
};
void main()
{
AppDomain^ myDomain = AppDomain::CurrentDomain;
AssemblyName^ asmName = gcnew AssemblyName;
asmName->Name = "MyDynamicAsm";
AssemblyBuilder^ myAsmBuilder = myDomain->DefineDynamicAssembly( asmName,
AssemblyBuilderAccess::RunAndSave );
ModuleBuilder^ myModule = myAsmBuilder->DefineDynamicModule( "MyDynamicAsm",
"MyDynamicAsm.dll" );
TypeBuilder^ myTypeBld = myModule->DefineType( "MyDynamicType",
TypeAttributes::Public );
// Get info from the user to build the method dynamically.
Console::WriteLine( "Let's build a simple method dynamically!" );
Console::WriteLine( "Please enter a few numbers, separated by spaces." );
String^ inputNums = Console::ReadLine();
Console::Write( "Do you want to [A]dd (default) or [M]ultiply these numbers? " );
String^ myMthdAction = Console::ReadLine()->ToUpper();
Console::Write( "Lastly, what do you want to name your new dynamic method? " );
String^ myMthdName = Console::ReadLine();
// Process inputNums into an array and create a corresponding Type array
int index = 0;
array<String^>^inputNumsList = inputNums->Split();
array<Type^>^myMthdParams = gcnew array<Type^>(inputNumsList->Length);
array<Object^>^inputValsList = gcnew array<Object^>(inputNumsList->Length);
for each (String^ inputNum in inputNumsList)
{
inputValsList[ index ] = Convert::ToInt32( inputNum );
myMthdParams[ index ] = int::typeid;
index++;
}
// Now, call the method building method with the parameters, passing the
// TypeBuilder by reference.
AddMethodDynamically( myTypeBld,
myMthdName,
myMthdParams,
int::typeid,
myMthdAction );
Type^ myType = myTypeBld->CreateType();
Console::WriteLine( "---" );
Console::WriteLine( "The result of {0} the inputted values is: {1}",
((myMthdAction->Equals( "M" )) ? "multiplying" : "adding"),
myType->InvokeMember( myMthdName,
BindingFlags::InvokeMethod | BindingFlags::Public | BindingFlags::Static,
nullptr,
nullptr,
inputValsList ) );
Console::WriteLine( "---" );
// Let's take a look at the method we created.
// If you are interested in seeing the MSIL generated dynamically for the method
// your program generated, change to the directory where you ran the compiled
// code sample and type "ildasm MyDynamicAsm.dll" at the prompt. When the list
// of manifest contents appears, click on "MyDynamicType" and then on the name of
// of the method you provided during execution.
myAsmBuilder->Save( "MyDynamicAsm.dll" );
MethodInfo^ myMthdInfo = myType->GetMethod( myMthdName );
Console::WriteLine( "Your Dynamic Method: {0};", myMthdInfo );
}