初始化私有成员C＃ [英] Initializing private members c#

问题描述

我有需要的对象被创建时要进行初始化的两个专用列表。第二列表是依赖于第一个。我能做到这一点是这样的：

 公共类MyClass的
  {
      私人列表＆LT; T＆GT; myList上=新的名单，其中，T＆GT;（）;
      私人ReadOnlyCollection还＆LT; T＆GT; myReadOnlyList = myList.AsReadOnly;

      ...
  }
 

第二个列表是只读围绕第一个包装。

我能想到的是C＃将这个顺序在每次运行时执行这两条线？

或者我应该把这个初始化的构造？

编辑：
对不起，愚蠢的问题。我试了一下，编译器说：

 错误1字段初始不能引用
             非静态字段，方法或属性...
 

解决方案

没有。如果你想基于类内的一个独立的变量初始化变量，你需要为此在构造函数中：

 公共类MyClass的
{
    私人列表＆LT; T＆GT; myList上=新的名单，其中，T＆GT;（）;
    私人ReadOnlyCollection还＆LT; T＆GT; myReadOnlyList;
    公共MyClass的（）
    {
        myReadOnlyList = myList.AsReadOnly;
    }

}
 

内联intializers总是在静态情况下，这意味着你有你的类中没有访问成员变量运行。内部构造的，但是，你可以做到这一点。你的构造，这就是为什么我可以离开该列表初始化到位前，将发生的内联初始化。

I have two private lists that need to be initialized when object is created. Second list is dependent on first one. Can I do it like this:

  public class MyClass
  {
      private List<T> myList = new List<T>();
      private ReadOnlyCollection<T> myReadOnlyList = myList.AsReadOnly;

      ...
  }

Second list is read only wrapper around first one.

Can I expect that c# will execute this two lines in this order each time it is run?

Or should I put this initializations in constructor?

Edit:
Sorry for stupid question. I tried it and compiler says:

Error   1   A field initializer cannot reference the 
             non-static field, method, or property...

解决方案

No. If you want to initialize a variable based on a separate variable within the class, you need to do this in the constructor:

public class MyClass 
{ 
    private List<T> myList = new List<T>(); 
    private ReadOnlyCollection<T> myReadOnlyList;
    public MyClass()
    {
        myReadOnlyList = myList.AsReadOnly; 
    }

} 

Inlined intializers are always run in a static context, which means you have no access to member variables within your class. Inside of a constructor, however, you can do this. The inlined initializers will occur before your constructor, which is why I could leave the list initialization in place.

这篇关于初始化私有成员C＃的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！