运算符处理简单的类型 int intA = 4; int intB = 5; if (intA > intB) { //Code } else { //Code }运算符用作类的对象：前提我们可以假设已经定义了运算符重载
运算符用作类的对象 public Class Student
{ private int score; public int Score { get{return score;} set{score=value;} }
} public Class Test
{ static void Main(string[] args) { Student stu1 = new Student(); Student stu2 =new Student(); if(stu1>stu2) { //Code } } }按照我们所刚刚所举的例子，来实现比较两个Student对象的成绩的大小：
View Code 1 class Student 2 { 3 private double score; 4 public double Score 5 { 6 set { score = value; } 7 get { return score; } 8 } 9 private string name;
10 public string Name
11 {
12 get { return name; }
13 set { name = value; }
14 }
15 public Student()
16 {
17 }
18 public Student(string name,double socre)
19 {
20 this.name = name;
21 this.Score = socre;
22 }
23 public static bool operator >(Student student1, Student student2)
24 {
25 return student1.Score>student2.Score;
26 }
27 public static bool operator <(Student student1, Student student2)
28 {
29 return student1.Score < student2.Score;
30 }
31 32 }
33 class Program
34 {
35 static void Main(string[] args)
36 {
37 Student stu1 = new Student("小王",43.4);
38 Student stu2 = new Student("小李",33.4);
39 if (stu1 > stu2)
40 {
41 Console.WriteLine( stu1.Name + "的成绩大于" + stu2.Name);
42 }
43 else
44 {
45 Console.WriteLine( stu1.Name + "的成绩小于" + stu2.Name);
46 }
47 }
48 }可以推断出，运算符重载的基本格式如下：
public static 返回类型 operator 运算符(类名 形参1,........);并且可以知道如果我们重载了“>”运算符，相应的我们必须重载“<”运算符，反之亦然。
与此类似的运算符还有"=="与"!=",但是此时我们还要重写Equals(),GetHashCode()方法;运算符“>=”与“<=”等等；
举例：
按照上面例子，增加如下要求，求学生zs与学生ls的成绩之和：
View Code 1 class Student 2 { 3 private double score; 4 public double Score 5 { 6 set { score = value; } 7 get { return score; } 8 } 9 private string name;
10 public string Name
11 {
12 get { return name; }
13 set { name = value; }
14 }
15 public Student()
16 {
17 }
18 public Student(string name,double socre)
19 {
20 this.name = name;
21 this.Score = socre;
22 }
23 public static Student operator +(Student student, Student student2)
24 {
25 Student s = new Student();
26 s.Score = student.score + student2.score;
27 return s;
28 }
29 }
30 class Program
31 {
32 static void Main(string[] args)
33 {
34 Student stu1 = new Student("小王",43.4);
35 Student stu2 = new Student("小李",33.4);
36 Student s = stu1 + stu2;
37 Console.WriteLine(s.Score);
38 }
39 }比较两个学生的成绩是否相等：
View Code 1 class Student 2 { 3 private double score; 4 public double Score 5 { 6 set { score = value; } 7 get { return score; } 8 } 9 private string name;
10 public string Name
11 {
12 get { return name; }
13 set { name = value; }
14 }
15 public Student()
16 {
17 }
18 public Student(string name,double socre)
19 {
20 this.name = name;
21 this.Score = socre;
22 }
23 public static bool operator >(Student student1, Student student2)
24 {
25 return student1.Score>student2.Score;
26 }
27 public static bool operator <(Student student1, Student student2)
28 {
29 return student1.Score < student2.Score;
30 }
31 public static bool operator ==(Student student1, Student student2)
32 {
33 return student1.Score == student2.Score;
34 }
35 public static bool operator !=(Student student1, Student student2)
36 {
37 return student1.Score != student2.Score;
38 }
39 public override bool Equals(object obj)
40 {
41 if (obj is Student)
42 {
43 return this.score == ((Student)obj).Score;
44 }
45 else
46 {
47 throw new Exception("数据类型错误");
48 }
49 }
50 public override int GetHashCode()
51 {
52 return (int)Math.Ceiling(this.score);
53 }
54 55 56 }
57 class Program
58 {
59 static void Main(string[] args)
60 {
61 Student stu1 = new Student("小王",43.4);
62 Student stu2 = new Student("小李",33.4);
63 if (stu1 == stu2)
64 {
65 Console.WriteLine(stu1.Name + "成绩等于" + stu2.Name);
66 }
67 else
68 {
69 Console.WriteLine(stu1.Name + "成绩不等于" + stu2.Name);
70 }
71 }
72 }定义长度为4的Student类型的数组，然后求总成绩：
View Code 1 class Student 2 { 3 private double score; 4 public double Score 5 { 6 set { score = value; } 7 get { return score; } 8 } 9 private string name;
10 public string Name
11 {
12 get { return name; }
13 set { name = value; }
14 }
15 public Student()
16 {
17 }
18 public Student(string name,double socre)
19 {
20 this.name = name;
21 this.Score = socre;
22 }
23 24 25 public static Student operator +(Student student, Student student2)
26 {
27 Student s = new Student();
28 s.Score = student.score + student2.score;
29 return s;
30 }
31 public static double operator +(double sum, Student student)
32 {
33 Student stu= new Student();
34 stu.score = sum + student.Score;
35 return stu.Score;
36 }
37 }
38 class Program
39 {
40 static void Main(string[] args)
41 {
42 Student[] stu = new Student[4];
43 stu[0] = new Student("zs", 34.4);
44 stu[1] = new Student("ls", 23.5);
45 stu[2] = new Student("ww", 34.5);
46 stu[3] = new Student("ml",23.1);
47 double sum = 0.0;
48 for (int i = 0; i < stu.Length; i++)
49 {
50 sum = sum +stu[i];
51 }
52 Console.WriteLine(sum);
53 }
54 }
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