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相關類如下，目標是用Emit生成一個Writer類，并返回一個IWriter接口，使用接口調用

public interface IWriter

{

void Write(string msg, string msg1);

}

 

public class Writer: IWriter

{

public  void Write(string msg,string msg1)

{

string ex = "ex";

string str = msg + msg1 + ex;

Console.WriteLine(str);

}

}

實現如下：

class Program

{

static void Main(string[] args)

{

IWriter writer = GetWriter();

writer.Write("test1", "test2");

Console.ReadLine();

}

 

private static IWriter GetWriter()

{

var assemblyName = new AssemblyName("DynamicAssembly");

 

var assemblyBuilder = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName,

AssemblyBuilderAccess.RunAndCollect);

var moduleBuilder = assemblyBuilder.DefineDynamicModule(assemblyName.Name);

 

 

var typeBuilder = moduleBuilder.DefineType("DefaultType", TypeAttributes.Public| TypeAttributes.Class);

 

typeBuilder.AddInterfaceImplementation(typeof(IWriter));

 

Type strType = typeof(string);

 

var methodBuilder = typeBuilder.DefineMethod("Write", MethodAttributes.Public| MethodAttributes.Virtual,typeof(void),new Type[]{ strType , strType });

 

methodBuilder.DefineParameter(1, ParameterAttributes.In, "msg");//Ldarg_1

 

methodBuilder.DefineParameter(2, ParameterAttributes.In, "msg1");//Ldarg_1

 

var iLGenerator = methodBuilder.GetILGenerator();

 

iLGenerator.DeclareLocal(typeof(string));//Ldloc_0

iLGenerator.DeclareLocal(typeof(string));//Ldloc_1

 

///https://docs.microsoft.com/en-us/dotnet/api/system.reflection.emit.opcodes.ldarg_1?view=netframework-4.7.2

 

iLGenerator.Emit(OpCodes.Nop);

iLGenerator.Emit(OpCodes.Ldstr,"ex");//Pushes a new object reference to a string literal stored in the metadata.

iLGenerator.Emit(OpCodes.Stloc_0); // Pops the current value from the top of the evaluation stack and stores it in a the local variable list at index 0.

  // 上一句是將ex 放到棧里(?),這句從棧里取出來賦值給 Ldloc_0

iLGenerator.Emit(OpCodes.Ldarg_1);

iLGenerator.Emit(OpCodes.Ldarg_2);

iLGenerator.Emit(OpCodes.Ldloc_0);

iLGenerator.Emit(OpCodes.Call, GetStringConcat());//計算結果保存在了棧里(?)

 

iLGenerator.Emit(OpCodes.Stloc_1);//將計算結果取出來賦值給 Ldloc_1

iLGenerator.Emit(OpCodes.Ldloc_1);//將 Ldloc_1 放入棧

 

iLGenerator.Emit(OpCodes.Call, GetWriteLine());

 

iLGenerator.Emit(OpCodes.Nop);

iLGenerator.Emit(OpCodes.Ret);

 

var type = typeBuilder.CreateType();

 

return (IWriter)Activator.CreateInstance(type);

}

 

private static MethodInfo GetStringConcat()

{

Type type = typeof(string);

MethodInfo method =type.GetMethod("Concat", new Type[] {type, type, type});

return method;

}

private static MethodInfo GetWriteLine()

{

Type type = typeof(Console);

MethodInfo method = type.GetMethod("WriteLine", new Type[] {typeof(string) });

return method;

}

}

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