using System;using System.Linq;using System.Reflection;using System.Reflection.Emit;namespace TestEmit{ public interface IPerson{ void SayHello(); } class Person2 { public void SayHello() { Console.WriteLine("i am person2"); } } class Test2 { static void Main(string[] args) { IPerson p = (IPerson)CreateType(); p.SayHello(); Console.ReadLine(); } public static object CreateType() { AssemblyName assemblyName = new AssemblyName("assemblyName"); AssemblyBuilder assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.RunAndSave); ModuleBuilder moduleBuilder = assemblyBuilder.DefineDynamicModule("PersonModule", "Person.dll"); TypeBuilder typeBuilder = moduleBuilder.DefineType("Person", TypeAttributes.Public); //*添加所实现的接口 typeBuilder.AddInterfaceImplementation(typeof(IPerson)); //实现方法 MethodBuilder mbIM = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Virtual | MethodAttributes.Final, null, Type.EmptyTypes); ILGenerator il = mbIM.GetILGenerator(); il.Emit(OpCodes.Ldstr, "The SayHello implementation of IPerson"); il.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); il.Emit(OpCodes.Ret); typeBuilder.DefineMethodOverride(mbIM, typeof(IPerson).GetMethod("SayHello")); //添加方法 //MethodBuilder sayHelloMethod = typeBuilder.DefineMethod("SayHello", MethodAttributes.Public, null, null); //ILGenerator ilOfSayHello = sayHelloMethod.GetILGenerator(); //ilOfSayHello.Emit(OpCodes.Ldstr, "蝈蝈"); //ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) })); //ilOfSayHello.Emit(OpCodes.Call, typeof(Console).GetMethod("ReadLine")); ////没有返回值所有加OpCodes.Pop //ilOfSayHello.Emit(OpCodes.Pop); //ilOfSayHello.Emit(OpCodes.Ret); Type personType = typeBuilder.CreateType(); assemblyBuilder.Save("Person.dll"); object obj = Activator.CreateInstance(personType); MethodInfo methodInfo = personType.GetMethod("SayHello"); methodInfo.Invoke(obj, null); return Activator.CreateInstance(personType); } } }