Reflection.Emit方法调用

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Reflection.Emit;

namespace ConsoleApplication1
{
    public delegate System.String FeedbackToString();

    class Program
    {
        static void Main(string[] args)
        {
            DynamicMethod dynamicMethod = new DynamicMethod(System.String.Empty,typeof(System.String),null,typeof(Program).Module);
            ILGenerator iLGenerator = dynamicMethod.GetILGenerator();
            LocalBuilder localBuilder = iLGenerator.DeclareLocal(typeof(System.String), true);
            iLGenerator.Emit(OpCodes.Ldstr,"Hello,World!");
            iLGenerator.Emit(OpCodes.Stloc,localBuilder);
            iLGenerator.Emit(OpCodes.Ldloc,localBuilder);
            iLGenerator.Emit(OpCodes.Ret);
            FeedbackToString fb = (FeedbackToString)dynamicMethod.CreateDelegate(typeof(FeedbackToString));
            Console.WriteLine("The result is {0}", fb());
            Console.Read();
        }
    }
}

 

看看对应的IL:

.class private autoansibeforefieldinit Program extends [mscorlib]System.Object { .method public hidebysig specialname rtspecialname instance void .ctor()cilmanaged { .maxstack 8 L_0000: ldarg.0 L_0001: call instance void [mscorlib]System.Object::.ctor() L_0006: ret } .method private hidebysig static void Main(string[] args)cilmanaged { .entrypoint .maxstack 5 .locals init ( [0] class [mscorlib]System.Reflection.Emit.DynamicMethod dynamicMethod, [1] class [mscorlib]System.Reflection.Emit.ILGenerator iLGenerator, [2] class [mscorlib]System.Reflection.Emit.LocalBuilder localBuilder, [3] class ConsoleApplication1.FeedbackToString fb) L_0000: nop L_0001: ldsfld string [mscorlib]System.String::Empty L_0006: ldtoken string L_000b: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle) L_0010: ldnull L_0011: ldtoken ConsoleApplication1.Program L_0016: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle) L_001b: callvirt instance class [mscorlib]System.Reflection.Module [mscorlib]System.Type::get_Module() L_0020: newobj instance void [mscorlib]System.Reflection.Emit.DynamicMethod::.ctor(string, class [mscorlib]System.Type, class [mscorlib]System.Type[], class [mscorlib]System.Reflection.Module) L_0025: stloc.0 L_0026: ldloc.0 L_0027: callvirt instance class [mscorlib]System.Reflection.Emit.ILGenerator [mscorlib]System.Reflection.Emit.DynamicMethod::GetILGenerator() L_002c: stloc.1 L_002d: ldloc.1 L_002e: ldtoken string L_0033: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle) L_0038: ldc.i4.1 L_0039: callvirt instance class [mscorlib]System.Reflection.Emit.LocalBuilder [mscorlib]System.Reflection.Emit.ILGenerator::DeclareLocal(class [mscorlib]System.Type, bool) L_003e: stloc.2 L_003f: ldloc.1 L_0040: ldsfld valuetype [mscorlib]System.Reflection.Emit.OpCode [mscorlib]System.Reflection.Emit.OpCodes::Ldstr L_0045: ldstr "Hello,World!" L_004a: callvirt instance void [mscorlib]System.Reflection.Emit.ILGenerator::Emit(valuetype [mscorlib]System.Reflection.Emit.OpCode, string) L_004f: nop L_0050: ldloc.1 L_0051: ldsfld valuetype [mscorlib]System.Reflection.Emit.OpCode [mscorlib]System.Reflection.Emit.OpCodes::Stloc L_0056: ldloc.2 L_0057: callvirt instance void [mscorlib]System.Reflection.Emit.ILGenerator::Emit(valuetype [mscorlib]System.Reflection.Emit.OpCode, class [mscorlib]System.Reflection.Emit.LocalBuilder) L_005c: nop L_005d: ldloc.1 L_005e: ldsfld valuetype [mscorlib]System.Reflection.Emit.OpCode [mscorlib]System.Reflection.Emit.OpCodes::Ldloc L_0063: ldloc.2 L_0064: callvirt instance void [mscorlib]System.Reflection.Emit.ILGenerator::Emit(valuetype [mscorlib]System.Reflection.Emit.OpCode, class [mscorlib]System.Reflection.Emit.LocalBuilder) L_0069: nop L_006a: ldloc.1 L_006b: ldsfld valuetype [mscorlib]System.Reflection.Emit.OpCode [mscorlib]System.Reflection.Emit.OpCodes::Ret L_0070: callvirt instance void [mscorlib]System.Reflection.Emit.ILGenerator::Emit(valuetype [mscorlib]System.Reflection.Emit.OpCode) L_0075: nop L_0076: ldloc.0 L_0077: ldtoken ConsoleApplication1.FeedbackToString L_007c: call class [mscorlib]System.Type [mscorlib]System.Type::GetTypeFromHandle(valuetype [mscorlib]System.RuntimeTypeHandle) L_0081: callvirt instance class [mscorlib]System.Delegate [mscorlib]System.Reflection.Emit.DynamicMethod::CreateDelegate(class [mscorlib]System.Type) L_0086: castclass ConsoleApplication1.FeedbackToString L_008b: stloc.3 L_008c: ldstr "The result is {0}" L_0091: ldloc.3 L_0092: callvirt instance string ConsoleApplication1.FeedbackToString::Invoke() L_0097: call void [mscorlib]System.Console::WriteLine(string, object) L_009c: nop L_009d: call int32 [mscorlib]System.Console::Read() L_00a2: pop L_00a3: ret } }

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