Is there a way to determine if a generic type is built from a specific generic type definition?

Question

I\'ve got a generic method:

Func, bool> CreateFunction()

where T can be any number of diff

Answer 1

You can avoid using ugly and potentially risky type name string checking using the IsGenericType and GetGenericTypeDefinition members, as follows:

var type = typeof (T);
if (typeof (IDictionary).IsAssignableFrom(type))
{
    //non-generic dictionary
}
else if (type.IsGenericType &&
         type.GetGenericTypeDefinition() == typeof (IDictionary<,>))
{
    //generic dictionary interface
}
else if (type.GetInterfaces().Any(
            i => i.IsGenericType &&
                 i.GetGenericTypeDefinition() == typeof (IDictionary<,>)))
{
    //implements generic dictionary
}