How can I employ the same set of rules that are used by the compiler to match the method in getmethod(..)

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I am writing an AOP against an old legacy class that does not have the benefit of a built in IoC container. I am employing the power of dynamic types, using the DynamicObject derived class. When I use the

mi = obj.GetType().GetMethod(methNm, parmType);

call, if the parameters types (represented by parmType, above) are not exactly the types that the method was declared with, then the above GetMthod(..) will not find the method.

My question to you is: Do you know of a way, potentially using Roslyn's semantic model, to employ the same set of rules that are used by the compiler to match the method in GetMethod(..) to the "best choice" of a method?

What I have tried:

I am reading through the RuntimeBinder hoping to find a clue...

Posted 9-Jan-17 15:38pm

Avi Farah

Updated 27-Jul-18 17:05pm

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Nathan Minier 10-Jan-17 7:48am

Not in an automagic manner, but you could enumerate through obj.GetType().GetMethods().Select(x => x.GetParameters) to map through a switch.

The problem is that it's a runtime determination, so the compiler can't do a "best-guess".

Avi Farah 11-Jan-17 21:39pm

Nathan, thank you! I'm hoping to be able use an existing functionality as opposed to building the logic that is in the compiler. When I figure it out I'll post it.

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Avi Farah · Accepted Answer · 2018-07-27T17:06:00

The problem with my code above is attempting to find the method using type arguments that do not exist in the original class. The line:

mi = obj.GetType().GetMethod(methNm, parmType);

is the culprit.

What I needed to do is use the Type1.IsAssignableFrom(Type2) to resolve which method to call.