Question

I have a Type variable t passed into a method, and I want to use it as a generic parameter when calling IQueryable.Join like the following

queryResult.Join<Type1, Type2, t, Type3>( items, outerSelector, innerSelector, ( a, b) => a);

It obviously doesn’t work. What should I do to t in order to achieve what I intended? Thanks!

Answer 1

Basically you’ve got to call the method with reflection:

• Get the generic method template with Type.GetMethod
• Call MakeGenericMethod passing in your 4 type parameters
• Invoke the method passing in the regular arguments

It’s a pain 🙁