Question

我正在创建一个动态类型：

AssemblyName assemblyName = new AssemblyName("LunarDynamicAssembly");
AssemblyBuilder _assembly = AppDomain.CurrentDomain.DefineDynamicAssembly(assemblyName, AssemblyBuilderAccess.Run);
ModuleBuilder _moduleBuilder = _assembly.DefineDynamicModule("DynamicModule", true);

TypeBuilder typeBuilder = _moduleBuilder.DefineType(original.Name + "Proxy", TypeAttributes.Public | TypeAttributes.Class, original, new Type[] { typeof(IProxy) });

// - This function only implements the IProxy interface and returns the private variable field.
FieldBuilder _interceptor = ImplementIProxy(typeBuilder);
ConstructorInfo _interceptorConstructor = typeof(Interceptor).GetConstructor(Type.EmptyTypes);

foreach (ConstructorInfo constructorInfo in original.GetConstructors())
{
    //Omitting for brev.
    //Recreating all the constructors and ensuring there's a line
    //_interceptor = new Interceptor();
    //in all of them.
}

foreach (PropertyInfo pInfo in original.GetProperties(BindingFlags.Public | BindingFlags.Instance))
{
    MethodInfo getMethod = pInfo.GetGetMethod();
    MethodInfo setMethod = pInfo.GetSetMethod();

    PropertyBuilder propertyBuilder = typeBuilder.DefineProperty(pInfo.Name, pInfo.Attributes, pInfo.PropertyType, null);

    MethodAttributes attributes = MethodAttributes.Public | MethodAttributes.SpecialName | MethodAttributes.HideBySig | MethodAttributes.Virtual | MethodAttributes.Final | MethodAttributes.NewSlot;
    MethodBuilder getBuilder = typeBuilder.DefineMethod(getMethod.Name, attributes, pInfo.PropertyType, null);
    ILGenerator getIL = getBuilder.GetILGenerator();

    // - Issues start here
    getIL.Emit(OpCodes.Ldarg_0);
    getIL.Emit(OpCodes.Ldloc, _interceptor);
    getIL.Emit(OpCodes.Callvirt, typeof(Interceptor).GetMethod("InterceptingFunction"));
    getIL.Emit(OpCodes.Stloc_0);
    getIL.Emit(OpCodes.Ldloc_0);

    getIL.Emit(OpCodes.Ret);

    typeBuilder.DefineMethodOverride(getBuilder, getMethod);
}

InterceptingFunction返回与属性相同的类型。我猜我错过了如何在我调用函数之前放置“实例”部分，从我在ILDasm中检查过。我怎么能这样做？

异常：公共语言运行时检测到无效程序。

（编辑）更多信息执行我正在尝试生成的函数的IL代码（返回20部分除外）：

// Code size       20 (0x14)
.maxstack  1
.locals init ([0] int32 CS$1$0000)
IL_0000:  nop
IL_0001:  ldarg.0
IL_0002:  ldfld      class [Test]Test.DataAccess.Interceptor Tests.MyClass::_interceptor
IL_0007:  callvirt   instance void [Test]Test.DataAccess.Interceptor::InterceptingFunction()
IL_000c:  nop
IL_000d:  ldc.i4.s   20
IL_000f:  stloc.0
IL_0010:  br.s       IL_0012
IL_0012:  ldloc.0
IL_0013:  ret

Answer 1

Constrast

getIL.Emit(OpCodes.Ldloc, _interceptor);

与

ldfld      class [Test]Test.DataAccess.Interceptor Tests.MyClass::_interceptor

ldloc指令用于加载本地，加载字段，您需要使用ldfld。

你也没有declare any local variables，但你还是试图使用一个（stloc.0，ldloc.0）。虽然在您的情况下，该局部变量是完全没必要的，但您可以将InterceptingFunction返回的值保留在堆栈中。（工作IL会这样做以帮助调试，我相信那些额外的指令，以及在发布模式下不会有不必要的分支。）

如何从使用Reflection.Emit生成的类中的变量调用函数？

1 个答案: