Differentiate generic methods by type parameters only using reflection?

Question

I'm trying to use reflection to get a specific MethodInfo of a class, but am unsure how to differentiate between the two following methods:

public class Test
{
    public IBar<T1> Foo<T1>();
    public IBar<T1, T2> Foo<T1, T2>();
}

How can I get a reference to the different Foo methods, assuming I know the number of type parameters? Just calling typeof(Test).GetMethod("Foo") will throw an exception that the method name is ambiguous and there aren't a differing number of parameters to check.

This can be of help.http://stackoverflow.com/questions/5218395/reflection-how-to-get-a-generic-method — Srinivas Reddy Thatiparthy, May 27 '14 at 15:26

Selman Genç · Accepted Answer · 2014-05-27T15:29:36.373

5

You could get all methods then filter them based on generic argument count:

typeof(Test).GetMethods()
.First(x => x.Name == "Foo" && x.GetGenericArguments().Length == 2);

Note that First method will throw an exception if there is no method that satisfies the condition.You can use FirstOrDefault and check for null instead if you want to avoid exceptions.

edited May 27 '14 at 15:29

answered May 27 '14 at 15:24

Selman Genç

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+1. I would be inclined to swap the comparison clauses in the `.Where` call, though. That way you're only calling `GetGenericArguments` for methods that have the name you're looking for. – Andrew Cooper May 27 '14 at 15:26
GetGenericArguments was exactly what I couldn't find. Thanks. – Brian Vallelunga May 27 '14 at 15:53

Differentiate generic methods by type parameters only using reflection?

1 Answers1