get 'ldftn' function pointer in C#

Question

in cil code, ldftn is used to get the function pointer address to call the delegate constructor(i.e. .ctor(object, native int)).
How to get the function pointer used to construct delegate in C#?

Answer 1

Your question is phrased in a way that makes it hard to understand what you're actually trying to do. I think that perhaps what you want is something like this:

MethodInfo mi = ...
var ptr = mi.MethodHandle.GetFunctionPointer();
// now call a delegate .ctor using that ptr

Answer 2

If you're looking for how the Reflection.Emit code should look, then something like this:

il.Emit(OpCodes.Ldftn, yourMethodInfo);
il.Emit(OpCodes.Newobj, yourDelegateType.GetConstructors()[0]);

The first line loads the function pointer onto the stack. The second line "passes" it to the constructor of the delegate. yourDelegateType should be something like typeof(Func<string>), etc.