C#高级语法基础知识总结4——运算符

比较引用类型的相等性

  1. ReferenceEquals() 静态方法，不能重写，如果提供的两个引用引用同一个对象实例，则返回true,否则就返回false。Null=null
  2. 虚拟的Equals(),可在自己的类中重写
  3. 静态的Equals()方法
  4. 比较运算符(==)

比较值类型的相等性

采用与引用类型相同的规则：ReferenceEquals()用于比较引用，Equals()用于比较值，比较运算符可以看做一个中间项。但最大的区别是值类型需要装箱，才能把它们转换为引用，进而才能对它们执行方法。

 

运算符重载

运算符重载 
  1  
  2 
  3             Vector vector1, vector2, vector3;
  4 
  5             vector1 = new Vector(3.0, 3.0, 1.0);
  6 
  7             vector2 = new Vector(2.0, -4.0, -4.0);
  8 
  9             vector3 = vector1 + vector2;
 10 
 11  
 12 
 13             Console.WriteLine("vector1={0}" , vector1.ToString());
 14 
 15             Console.WriteLine("vector2={0}", vector2.ToString());
 16 
 17             Console.WriteLine("vector3={0}", vector3.ToString());
 18 
 19  
 20 
 21             vector1 = 2 * vector1;
 22 
 23             Console.WriteLine("2*vector1={0}", vector1.ToString());
 24 
 25  
 26 
 27  
 28 
 29         struct Vector
 30 
 31         {
 32 
 33             private double _x, _y, _z;
 34 
 35             public double X { get { return _x; } set { _x = value; } }
 36 
 37             public double Y { get { return _y; } set { _y = value; } }
 38 
 39             public double Z { get { return _z; } set { _z = value; } }
 40 
 41  
 42 
 43             public Vector(double x, double y, double z)
 44 
 45             {
 46 
 47                 this._x = x;
 48 
 49                 this._y = y;
 50 
 51                 this._z = z;
 52 
 53             }
 54 
 55  
 56 
 57             public Vector(Vector rhs)
 58 
 59             {
 60 
 61                 _x = rhs._x;
 62 
 63                 _y = rhs._y;
 64 
 65                 _z = rhs._z;
 66 
 67             }
 68 
 69  
 70 
 71             public override string ToString()
 72 
 73             {
 74 
 75                 return "(" + _x + "," + _y + "," + _z + ")";
 76 
 77             }
 78 
 79  
 80 
 81             public static Vector operator +(Vector lhs, Vector rhs)
 82 
 83             {
 84 
 85                 Vector result = new Vector(lhs);
 86 
 87                 result._x += rhs._x;
 88 
 89                 result._y += rhs._y;
 90 
 91                 result._z += rhs._z;
 92 
 93                 return result;
 94 
 95             }
 96 
 97  
 98 
 99             //数和向量相乘
100 
101             public static Vector operator *(double lhs, Vector rhs)
102 
103             {
104 
105                 return new Vector(lhs * rhs._x, lhs * rhs._y, lhs * rhs._z);
106 
107             }
108 
109 
110             public static Vector operator *(Vector lhs, double rhs)
111 
112             {
113 
114                 return rhs * lhs;
115 
116             }
117 
118         }

posted @ 2012-07-16 22:25  Ghost Soar  阅读(353)  评论(0)  编辑  收藏  举报