C# cast example

Cast.cs

    class C<T> {}

    internal class D
    {
        public static C<U> M<U>(C<bool> c)
        {
            // Fail compiling: 
            // return (C<U>)c;
            // Pass compiling, exception in runtime: 
            // return X.Cast<C<U>>(c);
            // Pass compiling, exception in runtime: 
            return (C<U>)(object)c;
        }
    }

    public static class X
    {
        public static V Cast<V>(object obj)
        {
            return (V) obj;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
             C<bool> c = new C<bool>();
             D.M<int>(c);

            var enumerable = from bool b in new int[] {1, 2} select b;
            foreach (var element in enumerable)
            {
                Console.WriteLine(element);
            }
        }
    }