为什么我不能在struct中使用静态构造函数？ [英] why i can not use static constructor in struct ?

问题描述

  struct 雇用
 {
  static   string 通过; 
  int  id; 
  string  name; 
  static  Employ（）
 {
 Pass =  词; 
 Console.WriteLine（  creat static constructor Employ）; 
} 
  public 使用（ string  _name， int  _id）
 {
 name = _name; 
 id = _id; 
} 
} 
  class 计划
 {
 静态  void  Main（ string  [] args）
 {
 Employ Ob =  new 雇用（  mohamed ， 10 ）; 
 
} 
} 

为什么当我从struct创建变量时使用编译器不能访问静态构造函数??

解决方案

我刚刚尝试了你发布的代码，并且 static 构造函数是正确的在调用非 static 构造函数之前调用。

它肯定访问静态构造函数。但仅限于第一次创建Employ支柱实例时。如果您尝试第二次创建新实例，则无法访问。静态构造函数用于初始化任何静态数据，或执行仅需执行一次的特定操作



http://msdn.microsoft.com/en-us/library/k9x6w0hc（v = VS.80）的.aspx [ ^ ]

未调用静态构造函数，因为在Main方法中，您不引用 Employ 类的任何静态成员（参见静态构造函数 [ ^ ]： 在创建第一个实例或引用任何静态成员之前，会自动调用静态构造函数来初始化类。



更改

Quote：

static string Pass;

to

 public static string Pass; 

并将以下行添加到 Main 方法

 Console.WriteLine（Employ.Pass）; 

查看静态构造函数调用。

struct Employ
    {
        static string Pass;
        int id;
        string name;
        static Employ()
        {
            Pass = "Word";
            Console.WriteLine("creat static constructor Employ ");
        }
        public Employ(string _name,int _id)
        {
            name = _name;
            id = _id;
        }
    }
class Program
    {
        static void Main(string[] args)
        {
            Employ Ob = new Employ("mohamed", 10);

        }
    }

why when i creat variable from struct employ the compiler not access the static constructor ??

解决方案

I just tried the code you posted and the static constructor is correctly called right before the non-static constructor is called.

It definitely access static constructor. But only for first time when the "Employ" strut instance is created. if you trying to create new instance second time it will not access. A static constructor is used to initialize any static data, or to perform a particular action that needs performed once only

http://msdn.microsoft.com/en-us/library/k9x6w0hc(v=VS.80).aspx[^]

The static constructor is not called because in your Main method you don''t reference any static member of the Employ class (see Static Constructors[^]: A static constructor is called automatically to initialize the class before the first instance is created or any static members are referenced.

change

Quote:

static string Pass;

to

public static string Pass;

and add the following line to your Main method

Console.WriteLine(Employ.Pass);

To see the static constructor called.

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