＆QUOT;参考＆QUOT;关键字和引用类型 [英] "ref" keyword and reference types

问题描述

有人在我的团队偶然发现了一个引用类型

someone in my team stumbled upon a peculiar use of the ref keyword on a reference type

class A { /* ... */ } 

class B
{    
    public void DoSomething(ref A myObject)
    {
       // ...
    }
}

是否有任何理由理智的人会做这样的事情？我找不到这样的使用在C＃

Is there any reason someone sane would do such a thing? I can't find a use for this in C#

推荐答案

让

class A
{
    public string Blah { get; set; }
}

void Do (ref A a)
{
    a = new A { Blah = "Bar" };
}

然后

A a = new A { Blah = "Foo" };
Console.WriteLine(a.Blah); // Foo
Do (ref a);
Console.WriteLine(a.Blah); // Bar

---

但如果只是

---

But if just

void Do (A a)
{
    a = new A { Blah = "Bar" };
}

然后

A a = new A { Blah = "Foo" };
Console.WriteLine(a.Blah); // Foo
Do (a);
Console.WriteLine(a.Blah); // Foo

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