动态生成的类，实现IEnumerator <T> GetEnumerator（）和IEnumerator IEnumerable.GetEnumerator（）

Question

I have a problem with Reflection.Emit. I want to have dynamically created class, that has simple implementation of ICollection. All methods I've defined fine, instead of next two: public IEnumerator GetEnumerator() & IEnumerator IEnumerable.GetEnumerator() Next code shows what I want to be in my dynamic class:

public class SomeClassThatIsIEnumerable<T> : IEnumerable<T>
{
    public IEnumerator<T> GetEnumerator()
    {...}

    IEnumerator IEnumerable.GetEnumerator()
    {...}

}

This one is output from the Reflector opened my dynamic assembly:

public class SomeClassThatIsIEnumerable<T> : IEnumerable<T>
    {
        public IEnumerator<T> GetEnumerator()
        {
           ...
        }

        IEnumerator GetEnumerator()
        {
           ...
        }
    }

I'm defining my class In such way:

TypeBuilder myType = module.DefineType("myType"...);
myType.AddInterfaceImplementation(typeof(IEnumerable));
myType.AddInterfaceImplementation(typeof(IEnumerable<T>));
myType.AddInterfaceImplementation(typeof(ICollection<T>));
myType.DefineMethodOverride(myDefineGetEnumerator(...),typeof(IEnumerable).GetMethod("GetEnumerator");
myType.DefineMethodOverride(myDefineGetGenericEnumerator(...),typeof(IEnumerable<T>).GetMethod("GetEnumerator);
//Definitions of other ICollection methods
//Define GetEnumerator is looks like this:
MethodBuilder method = myType.DefineMethod("GetEnumerator", MethodAttributes.Final | MethodAttributes.Virtual...)
ILGenerator il = method.GetILGenerator();
// adding opcodes

when I call myType.CreateType TypeLoadException throws with message GetEnumerator method doesn't have implementation. I'm suggesting on problem with IEnumerable.GetEnumerator method, because I had problems in writing it on C#, not even in IL :). Can anyone help me?

Answer 1

It appears you should perhaps be using DefineMethod rather than DefineMethodOverride . There is an example of emitting an explicit interface implementation on MSDN. (I have not taken the time to try it however.)

Answer 2

Answer is next define of the method

 MethodBuilder myMethod = myType.DefineMethod("System.Collections.IEnumerable.GetEnumerator",
                   MethodAttributes.Private | MethodAttributes.HideBySig |
                MethodAttributes.NewSlot | MethodAttributes.Virtual | 
                MethodAttributes.Final);

It was amazing to me that writing an interface name in the name of the method would be to establish a unique relation with the interface