using System;

using System.Reflection;

public class Foo

{

    public static Foo Default { get { return new Foo(5); } }

    public int _x;

    public Foo(int x)

    {

        _x = x;

    }   

}

​

public struct Bar

{

    public int _x;

}

​

public static class GetDefaultHelper

{

    public static T GetDefaultInstance<T>()

    {

      var propInfo = typeof(T).GetProperty("Default", BindingFlags.Public | BindingFlags.Static);

      return (propInfo != null) ?  (T)propInfo.GetValue(null) : default(T);     

    }

}

public class Program

{

    public static void Main()

    {

        var myFoo = GetDefaultHelper.GetDefaultInstance<Foo>();

        var myBar = GetDefaultHelper.GetDefaultInstance<Bar>();

        Console.WriteLine(myFoo._x);

        Console.WriteLine(myBar._x);

    }

}