Method may only be called on a Type for which Type.IsGenericParameter is true

Question

I am getting this error on a routine which uses reflection to dump some object properties, something like the code below.

MemberInfo[] members = obj.GetType(         


        

Answer 1

So what exactly is a "Type for which Type.IsGenericParameter is true"

That means it is a generic type argument in an open generic type - i.e. where we haven't picked a T yet; for example:

// true
bool isGenParam = typeof(List<>).GetGenericArguments()[0].IsGenericParameter;

// false (T is System.Int32)
bool isGenParam = typeof(List).GetGenericArguments()[0].IsGenericParameter;

So; have you got some open generics hanging around? Perhaps if you can give an example of where you got your obj from?