c# - 为什么 "this"可以，但 "this"(在另一种方法中)不行？

Question

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Answer 1

this 用于引用类的当前实例。
在静态方法中，没有要引用的当前实例。

在第一个示例中，它引用了类 Resource_Windows_ContractEdit 的当前实例。
在第二个示例中，该方法是静态的，因此应该在没有类实例的情况下调用它。因此在该静态方法中你不能使用 this

C# Reference this

一个人为的例子

class Example1
{
     // static. could be used by static methods and it is shared between all instances
     private static int counter = 0;

     // instance variable, exists with different indipendent storage for every instance
     private int v;

     public Example1()
     {
          // We can use the static variable because it is shared between all instances..
          counter = counter + 1;
     }

     public int SumValue(int x)
     {
         // Sum only for the first 10 instances of this class..
         // Yes weird, but it is just a contrived example
         if(Example1.counter < 10)
             this.v = this.v + x:

         return this.v;

     }

     // Cannot use the this keyword neither the instance internal variables
     // Could use the static variables
     public static int GetCurrentInstanceCounter()
     {
         return counter;
     }
}

void Main()
{
    Example1 a = new Example1();

    // a is an instance of class Example1 and could use the this keyword
    int result = a.sumValue(10);
    Console.WriteLine(result.ToString());

    // GetCurrentInstanceCounter is static, no instance required to call it, just the class name 
    int c = Example1.GetCurrentInstanceCounter();
    Console.WriteLine("Created " + c.ToString() + " instances of Example1");
}