using System;

​

public static class Program

{

    public static void Main()

    {

        var obj = new Foo();

        ref int alias = ref obj.Number;

        alias = 10;

        Console.WriteLine(obj.Number); //  輸出 "10"

        obj = new Foo();

        Console.WriteLine(alias); // 輸出 "0" 還是 "10"？

    }

}

​

public class Foo

{

    public int Number = 0;

}