为什么我只能从静态函数访问静态成员？ [英] Why can I only access static members from a static function?

问题描述

我有一个类的静态函数。

I have a static function in a class.

每当我尝试使用非静态数据成员，我获得以下编译错误。

whenever I try to use non static data member, I get following compile error.

这是对象引用是必需的非静态字段，方法或属性成员

An object reference is required for the nonstatic field, method, or property member

为什么表现成这样？

推荐答案

一个非静态成员属于一个实例。这是毫无意义的解决不知何故，你是在谈论一个类的实例。在静态情况下，你没有一个实例，这就是为什么你不能没有明确提到对象引用访问非静态成员。

A non-static member belongs to an instance. It's meaningless without somehow resolving which instance of a class you are talking about. In a static context, you don't have an instance, that's why you can't access a non-static member without explicitly mentioning an object reference.

其实，您可以通过明确指定对象引用访问非静态成员在静态方面：

In fact, you can access a non-static member in a static context by specifying the object reference explicitly:

class HelloWorld {
   int i;
   public HelloWorld(int i) { this.i = i; }
   public static void Print(HelloWorld instance) {
      Console.WriteLine(instance.i);
   }
}

var test = new HelloWorld(1);
var test2 = new HelloWorld(2);
HelloWorld.Print(test);

如果没有明确提到该实例中的打印方法，如何将它知道它应该打印1和2不？

Without explicitly referring to the instance in the Print method, how would it know it should print 1 and not 2?

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