您使用MethodBuilder来定义方法。要定义方法体,请调用GetILGenerator()以获得ILGenerator,然后调用Emit方法发出单独的IL指令。有MSDN文档MethodBuilder上的例子,你可以找到如何使用反射Using Reflection Emit页面上发出其他的例子:
public static void AddMethodDynamically(TypeBuilder myTypeBld,
string mthdName,
Type[] mthdParams,
Type returnType,
string mthdAction)
{
MethodBuilder myMthdBld = myTypeBld.DefineMethod(
mthdName,
MethodAttributes.Public |
MethodAttributes.Static,
returnType,
mthdParams);
ILGenerator ILout = myMthdBld.GetILGenerator();
int numParams = mthdParams.Length;
for (byte x = 0; x < numParams; x++)
{
ILout.Emit(OpCodes.Ldarg_S, x);
}
if (numParams > 1)
{
for (int y = 0; y < (numParams - 1); y++)
{
switch (mthdAction)
{
case "A": ILout.Emit(OpCodes.Add);
break;
case "M": ILout.Emit(OpCodes.Mul);
break;
default: ILout.Emit(OpCodes.Add);
break;
}
}
}
ILout.Emit(OpCodes.Ret);
}
这听起来像你正在寻找资源上写MSIL 。一个重要的资源是OpCodes类,每个IL指令都有一个成员。文档描述了每条指令的工作原理。另一个重要资源是Ildasm或Reflector。这些将让你看到编译代码的IL,这将有助于你理解你想写什么IL。通过反射运行你GetDetailsMethod并设置语言IL产量:
.method public hidebysig instance string GetDetails() cil managed
{
.maxstack 4
.locals init (
[0] string Details,
[1] string CS$1$0000,
[2] int32 CS$0$0001)
L_0000: nop
L_0001: ldstr "Name = "
L_0006: ldarg.0
L_0007: call instance string ConsoleApplication1.TestClass::get_Name()
L_000c: ldstr ", Size = "
L_0011: ldarg.0
L_0012: call instance int32 ConsoleApplication1.TestClass::get_Size()
L_0017: stloc.2
L_0018: ldloca.s CS$0$0001
L_001a: call instance string [mscorlib]System.Int32::ToString()
L_001f: call string [mscorlib]System.String::Concat(string, string, string, string)
L_0024: stloc.0
L_0025: ldloc.0
L_0026: stloc.1
L_0027: br.s L_0029
L_0029: ldloc.1
L_002a: ret
}
动态生成这样的方法,你将需要调用ILGenerator.Emit每个指令:
ilGen.Emit(OpCodes.Nop);
ilGen.Emit(OpCodes.Ldstr, "Name = ");
ilGen.Emit(OpCodes.Ldarg_0);
ilGen.Emit(OpCodes.Call, nameProperty.GetGetMethod());
// etc..
您可能还想寻找MSIL的介绍,比如这个:Introduction to IL Assembly Language。