WinRT IsInstanceOfType, IsAssignableFrom

gistfile1.cs

        /// <summary>
        /// Determines whether the specified object is an instance of the current Type.
        /// </summary>
        /// <param name="type">The type.</param>
        /// <param name="o">The object to compare with the current type.</param>
        /// <returns>true if the current Type is in the inheritance hierarchy of the 
        /// object represented by o, or if the current Type is an interface that o 
        /// supports. false if neither of these conditions is the case, or if o is 
        /// null, or if the current Type is an open generic type (that is, 
        /// ContainsGenericParameters returns true).</returns>
        public static bool IsInstanceOfType(this Type type, object o)
        {
            return o != null && type.IsAssignableFrom(o.GetType());
        }

        internal static bool ImplementInterface(this Type type, Type ifaceType)
        {
            while (type != null)
            {
                Type[] interfaces = type.GetTypeInfo().ImplementedInterfaces.ToArray(); //  .GetInterfaces();
                if (interfaces != null)
                {
                    for (int i = 0; i < interfaces.Length; i++)
                    {
                        if (interfaces[i] == ifaceType || (interfaces[i] != null && interfaces[i].ImplementInterface(ifaceType)))
                        {
                            return true;
                        }
                    }
                }
                type = type.GetTypeInfo().BaseType;
                // type = type.BaseType;
            }
            return false;
        }

        public static bool IsAssignableFrom(this Type type, Type c)
        {
            if (c == null)
            {
                return false;
            }
            if (type == c)
            {
                return true;
            }

            //RuntimeType runtimeType = type.UnderlyingSystemType as RuntimeType;
            //if (runtimeType != null)
            //{
            //    return runtimeType.IsAssignableFrom(c);
            //}

            //if (c.IsSubclassOf(type))
            if (c.GetTypeInfo().IsSubclassOf(c))
            {
                return true;
            }

            //if (type.IsInterface)
            if (type.GetTypeInfo().IsInterface)
            {
                return c.ImplementInterface(type);
            }

            if (type.IsGenericParameter)
            {
                Type[] genericParameterConstraints = type.GetTypeInfo().GetGenericParameterConstraints();
                for (int i = 0; i < genericParameterConstraints.Length; i++)
                {
                    if (!genericParameterConstraints[i].IsAssignableFrom(c))
                    {
                        return false;
                    }
                }
                return true;
            }
            return false;
        }