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public static class TypeExtensions
{
    public static bool IsAssignableFromGeneric(this Type @base, Type derived)
    {
        var interfaceTypes = derived.GetInterfaces();

        foreach (var it in interfaceTypes)
        {
            if (it.IsGenericType && it.GetGenericTypeDefinition() == @base)
                return true;
        }

        if (derived.IsGenericType && derived.GetGenericTypeDefinition() == @base)
            return true;

        Type baseType = derived.BaseType;
        if (baseType == null) return false;

        return IsAssignableFromGeneric(@base, baseType);
    }
}