具有此关键字的实例和静态方法 [英] Instance and Static Method with this Keyword

问题描述

我是学生。我有一个问题！。我不明白这个关键字的实例和静态方法..请帮助我。谢谢你！

解决方案

简而言之：实例方法获取隐式参数this，用于访问完成调用的实例。静态方法没有它;它大致相当于前OOP功能/程序;在.NET中，静态方法不能是虚拟的（但也有技术可以）。



为了说明实例方法机制，请考虑这个：

  class  MyClass {
  internal   void  SomeInstanceMethod（）{ //  this参数未显示，但它就在那里 
 这个 .SomeMember =  3 ;  //   SomeMember对象是哪个？见下文......  
} 
 内部  int  SomeMember {  get ;  set ; } 
} 
 
 MyClass myInstance =  new  MyClass（）; 
 
 myInstance.SomeInstanceMethod（）; 
  //  在此次调用中输入SomeInstanceMethod堆栈帧时， 
  //  这等于myInstance  
  //  如果是静态方法，则调用等同于 
  //  < span class =code-comment> SomeInstanceMethod（myInstance） 

如你所见， myInstance。*（） call是将实例参数this传递给方法的方法。

-SA

i am student .i have a question!.i dont understand "Instance and Static Method with this Keyword"..plz help me .thank you!

解决方案

In brief: instance method gets implicit parameter "this" used to access the instance on which the call is done. Static method does not have it; it is roughly equivalent to the pre-OOP function/procedure; in .NET, a static method cannot be virtual (but there are technologies where it can be).

To illustrate instance method mechanism, consider this:

class MyClass {
   internal void SomeInstanceMethod() { // "this" parameter is not shown, but it's there
       this.SomeMember = 3; // which SomeMember object is this? see below...
   }
   internal int SomeMember { get; set; }
}

MyClass myInstance = new MyClass();

myInstance.SomeInstanceMethod();
// when you enter SomeInstanceMethod stack frame in this call,
// this equals to myInstance
// if it was a static method, the call would be equivalent to
// SomeInstanceMethod(myInstance)

As you can see, myInstance.*() call is the way to pass instance parameter "this" to the method.

—SA

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