Can I use generic T in an extension method?

Question

Trying to mimic this post: Create Generic method constraining T to an Enum

public static string[] ToTextArray(this Dictionary<string, T> dictionary) where T:struct, IConvertible
{
    ...
}

It appears my T cannot be resolved. What is the correct way to write an extension method for all Dictionary<string, enum_type> classes?

Answer 1

You're missing the generic type parameter in the method declaration:

public static string[] ToTextArray<T>(this Dictionary<string, T> dictionary) 
  where T: struct, IConvertible