Calling a static method on a generic type parameter

In this case you should just call the static method on the constrainted type directly. C# (and the CLR) do not support virtual static methods. So:

T.StaticMethodOnSomeBaseClassThatReturnsCollection

…can be no different than:

SomeBaseClass.StaticMethodOnSomeBaseClassThatReturnsCollection

Going through the generic type parameter is an unneeded indirection and hence not supported.