Delegate.CreateDelegate vs DynamicMethod vs Expression

Question

Questions about Making reflection fly and exploring delegates...

If I need to create delegates Func to methods on dynamically loaded t

Answer 1

If they're actually existing methods which you have a MethodInfo for, and they have the right signatures, then I'd say Delegate.CreateDelegate is the right way to go - it does exactly what you want, with no fuss. I'd use DynamicMethod or expression trees if I needed to build a delegate to execute some logic which wasn't already captured in a method.

Expression trees are (IMO, and I haven't used DynamicMethod in anger) slightly easier to use than DynamicMethod, but they're more restricted - basically they can only represent a single expression (which could call another method, of course). DynamicMethod gives you lots of flexibility, but you need to understand IL reasonably well.

Does that help?

Answer 2

Via Ayende's blog I got this interesting link which shows off the kind of things you can do with Dynamic Methods. As an example it is quite understandable:
Accelerating Enum-Based Dictionaries with Generic EnumComparer

Update

One should note that in the world of WinRT, Reflection.Emit is unavailable - some information can be found here