.net - Check if object is of non-specific generic type in C#

Question

Say I have the following class:

public class General<T> { }

And I want to find out if an object is of that type. I know I can use reflection to find out whether the object is of that generic type with Type.GetGenericTypeDefinition, but I want to avoid that.

Is it possible to do something like obj is General<T>, or obj.GetType().IsAssignableFrom(typeof(General<T>))?

I'm quite surprised that I couldn't find a similar question, although I may have used wrong keywords in my searches.

Answer 1

You can do this:

var obj = new General<int>();
var type = obj.GetType();
var isGeneral = 
(type.IsGenericType && type.GetGenericTypeDefinition() == typeof(General<>)) ||
type.GetBaseTypes().Any(x => x.IsGenericType && 
                             x.GetGenericTypeDefinition() == typeof(General<>));

Where GetBaseTypes is the following extension method:

public static IEnumerable<Type> GetBaseTypes(this Type type)
{
    if (type.BaseType == null) return type.GetInterfaces();

    return new []{type}.Concat(
           Enumerable.Repeat(type.BaseType, 1)
                     .Concat(type.GetInterfaces())
                     .Concat(type.GetInterfaces().SelectMany<Type, Type>(GetBaseTypes))
                     .Concat(type.BaseType.GetBaseTypes()));
}

credits to Slacks answer