如何访问一个自动实现的属性的支持变量？ [英] How can I access the backing variable of an auto-implemented property?

问题描述

在过去，我们声明如下属性：

In the past we declared properties like this:

public class MyClass
{
    private int _age;

    public int Age
    {
          get{ return _age;  }
          set{ _age = value; }
    }
}

现在我们可以做的：

public class MyClass
{
    public int Age {get; set;} 
}

我的问题是，我怎么能访问私有变量，使用这个符号自动创建的？

My question is, how can I access the private variable that is created automatically using this notation?

我宁愿访问私有变量，而不是公共存取'年龄'。是否有一个默认的表示法访问私有变量，或者它仅仅是不可能的？

I would rather access the private variable and not the public accessor 'Age'. Is there a default notation to access the private variable, or it is just not possible?

推荐答案

新的自动属性的目的是减少样板代码，你需要写的时候你只需要一个简单的属性，这并不需要在GET或设定任何特殊的逻辑量。

The aim of the new automatic properties is to reduce the amount of boilerplate code you need to write when you just have a simple property that doesn't need any special logic in the get or the set.

如果您要访问这些属性使用私有成员，这通常有几个原因：

If you want to access the private member that these properties use, that's usually for a few reasons:

• 您需要的不仅仅是一个简单的get / set更多 - 在这种情况下，你应该避免使用自动属性此成员


• 您想避免的。通过走吧或设置而直接使用成员的性能影响 - 在这种情况下，我会感到惊讶，如果真有性能损失。简单的get / set成员非常非常容易内联，并在我的（诚然有限）测试中，我还没有发现使用自动属性，直接访问成员之间的差异。



• 您只需要拥有公共读取权限（也就是，只有'得到'）和类写成员直接 - 在这种情况下，你可以使用一个私人一套您的自动财产。 。即

• You need to more than just a simple get/set - in this case, you should just avoid using automatic properties for this member.
• You want to avoid the performance hit of going through the get or set and just use the member directly - in this case, I'd be surprised if there really was a performance hit. The simple get/set members are very very easy to inline, and in my (admittedly limited) testing I haven't found a difference between using the automatic properties and accessing the member directly.

• You only want to have public read access (i.e. just a 'get') and the class write to the member directly - in this case, you can use a private set in your automatic property. i.e.

public class MyClass
{
    public int Age {get; private set;} 
}

这通常包括最原因希望获得直接由自动属性用于支持字段。

This usually covers most the reasons for wanting to directly get to the backing field used by the automatic properties.

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