C# this关键字

 1         //构造函数-重载
 2          public Student(int id, string name, int age, int math)
 3         {
 4             this.Id = id;
 5             this.Name = name;
 6             this.Age = age;
 7             this.Math = math;
 8         }
 9 
10         //this关键字，具有最少参数的构造器调用具有最多参数的构造器
11         public Student(int id, int math)
12             :this(id,"NULL",0, 100)
13         {
14         }