How to use a Type variable in a generic method call (C#)

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

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 :(