1、代表当前类的对象
1 class Program
2 {
3 static void Main(string[] args)
4 {
5 Teacher t = new Teacher();
6 Console.WriteLine(t.getResult());
7
8
9 Console.ReadKey();
10 }
11 }
12 public class Teacher
13 {
14 private string scope = "全局变量";
15 public string getResult()
16 {
17 string scope = "局部变量";
18 // this代表Teacher类的对象
19 // 所以this.scope对应的是全局变量
20 // scope对应的是getResult方法内的局部变量
21 return this.scope + "-" + scope;
22 }
23 }
运行结果：
2、显式的调用自己的构造函数
1 class Program
2 {
3 static void Main(string[] args)
4 {
5 Teacher t = new Teacher("张三");
6
7 Console.ReadKey();
8 }
9 }
10 public class Teacher
11 {
12 public Teacher()
13 {
14 Console.WriteLine("无参构造函数");
15 }
16 // this()对应无参构造方法Teacher()
17 // 先执行Teacher()，后执行Teacher(string text)
18 public Teacher(string text) : this()
19 {
20 Console.WriteLine(text);
21 Console.WriteLine("有参构造函数");
22 }
23 }
运行结果：
1 class Program
2 {
3 static void Main(string[] args)
4 {
5 Teacher t2 = new Teacher("张三", 18, '男');
6 t2.SayHi();
7
8 Console.ReadKey();
9 }
10 }
11
12 class Teacher
13 {
14 public string Name { get; set; }
15 public int Age { get; set; }
16 public char Gender { get; set; }
17
18 public int Chinese { get; set; }
19 public int Math { get; set; }
20 public int English { get; set; }
21
22
23 public Teacher(string name, int age, char gender, int chinese, int math, int english)
24 {
25 this.Name = name;
26 this.Age = age;
27 this.Gender = gender;
28 this.Chinese = chinese;
29 this.Math = math;
30 this.English = english;
31 }
32
33 public Teacher(string name, int age, char gender) : this(name, age, gender, 0, 0, 0)
34 { }
35
36 public void SayHi()
37 {
38 Console.WriteLine("我叫{0},今年{1}岁了,我是{2}生", this.Name, this.Age, this.Gender);
39 }
40 }
运行结果：
3、为原始类型扩展方法
static class Extends
{
public static object ToJson(this string Json)
{
return Json == null ? null : JsonConvert.DeserializeObject(Json);
}
}
4、索引器
1 class Program
2 {
3 static void Main(string[] args)
4 {
5 int[] nums = { 1, 2, 3, 4, 5 };
6 Console.WriteLine(nums[2]);
7 Person p = new Person();
8 p.Numbers = new int[] { 1, 2, 3, 4, 5 };
9
10 p[0] = 1;
11 p[1] = 2;
12 p[2] = 3;
13 p[3] = 4;
14 Console.WriteLine(p[0]);
15 Console.WriteLine(p[1]);
16
17 p["张三"] = "嘿嘿嘿";
18 p["李四"] = "呵呵呵";
19 p["王五"] = "哈哈哈";
20 Console.WriteLine(p[3]);
21
22 Console.ReadKey();
23 }
24 }
25
26 class Person
27 {
28 public int[] Numbers { get; set; } = new int[5];
29
30 //索引器 让对象以索引的方式操作数组
31 public int this[int index]
32 {
33 get { return Numbers[index]; }
34 set { Numbers[index] = value; }
35 }
36
37 Dictionary<string, string> dic = new Dictionary<string, string>();
38 public string this[string index]
39 {
40 get { return dic[index]; }
41 set { dic[index] = value; }
42 }
43 }