Create an Enumerable for an Anonymous Type

anonymous-enumerable.cs

var list = Enumerable.Empty<object>()
             .Select(r => new {A = 0, B = 0}) // prototype of anonymous type
             .ToList();

list.Add(new { A = 4, B = 5 }); // adding actual values

Console.Write(list[0].A);

extension-method.cs

// http://stackoverflow.com/a/901936
public static class Extensions{
    public static IEnumerable<T> CastByExample<T>(
            this IEnumerable sequence, 
            T example) where T: class
    {
        foreach (Object o in sequence)
            yield return o as T;
    }
}

public static class AnonymousEnumerableFactory{
    public static IEnumerable<T> CastByExample<T>(T example) where T: class
    {
        //http://stackoverflow.com/a/14702242
      Func<object, T> func1 = (x) => example;
      var list = Enumerable.Empty<object>()
               .Select(func1); // prototype of anonymous type
      return list;
    }
}