System.Reflection.Emit 动态实现接口

+ View Code?

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46

class Program    {        static void Main(string[] args)        {            var obj = EmitHelper.ImplInterface<IPerson>();            obj.say();            obj.sayHi();        }    }           public interface IPerson    {        void say();        void sayHi();    }          public class EmitHelper    {        public static T ImplInterface<T>()        {            string name = "ImplInterface";            AssemblyName asmName = new AssemblyName(name);            Type classType = typeof(T);            var assemblyBuilder = AssemblyBuilder.DefineDynamicAssembly(asmName, AssemblyBuilderAccess.RunAndCollect);            var modelBuider = assemblyBuilder.DefineDynamicModule(name + ".dll");            var typeBuilder = modelBuider.DefineType("impl_" + classType.Name);            typeBuilder.AddInterfaceImplementation(typeof(T));              var methods = classType.GetMembers();            foreach (var method in methods)            {                var methodBuilder = typeBuilder.DefineMethod(method.Name, MethodAttributes.Public | MethodAttributes.HideBySig | MethodAttributes.NewSlot | MethodAttributes.Virtual | MethodAttributes.Final, null, Type.EmptyTypes);                typeBuilder.DefineMethodOverride(methodBuilder, typeof(T).GetMethod(method.Name));                               //TODO:以下是方法体的生成，还得再分析与修改                ILGenerator il = methodBuilder.GetILGenerator();                il.Emit(OpCodes.Ldstr, "接口：" + method.Name);                il.Emit(OpCodes.Call, typeof(Console).GetMethod("WriteLine", new Type[] { typeof(string) }));                il.Emit(OpCodes.Ret);              }            Type objType = typeBuilder.CreateType();            object obj = Activator.CreateInstance(objType);             return (T)obj;        }    }