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TypeBuilder.DefineMethod Method (String, MethodAttributes, CallingConventions, Type, Type[])

Adds a new method to the type, with the specified name, method attributes, calling convention, and method signature.

Namespace:  System.Reflection.Emit
Assembly:  mscorlib (in mscorlib.dll)

public MethodBuilder DefineMethod(
	string name,
	MethodAttributes attributes,
	CallingConventions callingConvention,
	Type returnType,
	Type[] parameterTypes
)

Parameters

name
Type: System.String

The name of the method. name cannot contain embedded nulls.

attributes
Type: System.Reflection.MethodAttributes

The attributes of the method.

callingConvention
Type: System.Reflection.CallingConventions

The calling convention of the method.

returnType
Type: System.Type

The return type of the method.

parameterTypes
Type: System.Type[]

The types of the parameters of the method.

Return Value

Type: System.Reflection.Emit.MethodBuilder
A MethodBuilder representing the newly defined method.

ExceptionCondition
ArgumentException

The length of name is zero.

-or-

The type of the parent of this method is an interface, and this method is not virtual (Overridable in Visual Basic).

ArgumentNullException

name is null.

InvalidOperationException

The type was previously created using CreateType.

-or-

For the current dynamic type, the IsGenericType property is true, but the IsGenericTypeDefinition property is false.

The following code sample demonstrates the use of DefineMethod to set a constructor's particular signature and attributes on a dynamic type and to return a corresponding MethodBuilder for MSIL population.

using System;
using System.Threading;
using System.Reflection;
using System.Reflection.Emit;
using System.Security.Permissions;

public interface IMyInterface
{
   String HelloMethod(String parameter);
}

public class Example
{
   [PermissionSetAttribute(SecurityAction.Demand, Name="FullTrust")]
   public static void Main()
   {
      Type myNestedClassType = CreateCallee(Thread.GetDomain());
      // Cretae an instance of 'MyNestedClass'.
      IMyInterface myInterface =
         (IMyInterface)Activator.CreateInstance(myNestedClassType);
      Console.WriteLine(myInterface.HelloMethod("Bill"));
   }

   // Create the callee transient dynamic assembly. 
   private static Type CreateCallee(AppDomain myAppDomain)
   {
      AssemblyName myAssemblyName = new AssemblyName();
      myAssemblyName.Name = "Example";
      // Create the callee dynamic assembly.
      AssemblyBuilder myAssembly =
         myAppDomain.DefineDynamicAssembly(myAssemblyName, AssemblyBuilderAccess.Run);
      // Create a dynamic module in the callee assembly.
      ModuleBuilder myModule = myAssembly.DefineDynamicModule("EmittedModule");
      // Define a public class named "MyHelloWorld".
      TypeBuilder myHelloWorldType =
         myModule.DefineType("MyHelloWorld", TypeAttributes.Public);
      // Define a public nested class named 'MyNestedClass'.
      TypeBuilder myNestedClassType =
         myHelloWorldType.DefineNestedType("MyNestedClass",
            TypeAttributes.NestedPublic, typeof(Example),
            new Type[]{typeof(IMyInterface)});
      // Implement 'IMyInterface' interface.
      myNestedClassType.AddInterfaceImplementation(typeof(IMyInterface));
      // Define 'HelloMethod' of 'IMyInterface'.
      MethodBuilder myHelloMethod =
         myNestedClassType.DefineMethod("HelloMethod",
            MethodAttributes.Public | MethodAttributes.Virtual,
            typeof(String), new Type[]{typeof(String)});
      // Generate IL for 'GetGreeting' method.
      ILGenerator myMethodIL = myHelloMethod.GetILGenerator();
      myMethodIL.Emit(OpCodes.Ldstr, "Hi! ");
      myMethodIL.Emit(OpCodes.Ldarg_1);
      MethodInfo infoMethod =
         typeof(String).GetMethod("Concat",new Type[]{typeof(string),typeof(string)});
      myMethodIL.Emit(OpCodes.Call, infoMethod);
      myMethodIL.Emit(OpCodes.Ret);

      MethodInfo myHelloMethodInfo =
         typeof(IMyInterface).GetMethod("HelloMethod");
      // Implement 'HelloMethod' of 'IMyInterface'.
      myNestedClassType.DefineMethodOverride(myHelloMethod, myHelloMethodInfo);
      // Create 'MyHelloWorld' type.
      Type myType = myHelloWorldType.CreateType();
      // Create 'MyNestedClass' type. 
      return myNestedClassType.CreateType();
   }
}

Windows 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0, 1.1, 1.0
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