一个例子帮你搞懂C#语言高级特性系列（01） --- 运算符重载

本是古典何须时尚 2021-09-22 03:22 204阅读 0赞

下面的例子演示了如何使用C\#的运算符重载：

using System;
    
    namespace Com.LoonStudio.Example {
        /// <summary>
        /// 平面上的点
        /// </summary>
        public class Point {
            public double X { set; get; }	// 横坐标
            public double Y { set; get; }	// 纵坐标
    
    		public Point(double x, double y) {
    			X = x;
    			Y = y;
    		}
    
    		/// <summary>
    		/// 将*定义为计算两点间距离的运算符
    		/// </summary>
    		/// <param name="p1">点1</param>
    		/// <param name="p2">点2</param>
    		/// <returns>两点间的距离</returns>
    		public static double operator *(Point p1, Point p2) {
    			double dx = p1.X - p2.X;
    			double dy = p1.Y - p2.Y;
    			return Math.Sqrt(dx * dx + dy * dy);
    		}
        }
    
    	public class Line {
    		public Point Start { set; get; }	// 起点
    		public Point End { set; get; }		// 终点
    
    		public Line(Point start, Point end) {
    			Start = start;
    			End = end;
    		}
    
    		/// <summary>
    		/// 将|运算符定义为判断两条线段是否平行的运算符
    		/// </summary>
    		/// <param name="line1">线段1</param>
    		/// <param name="line2">线段2</param>
    		/// <returns>平行返回true，不平行返回false</returns>
    		public static bool operator |(Line line1, Line line2) {
    			double slope1 = line1.End.Y - line1.Start.Y / line1.End.X - line1.Start.X;
    			double slope2 = line2.End.Y - line2.Start.Y / line2.End.X - line2.Start.X;
    			return slope1 == slope2;
    		}
    
    		/// <summary>
    		/// 线段的长度（通过*运算符计算起点和终点的距离）
    		/// </summary>
    		public double Length {
    			get { return Start * End; }
    		}
    	}
    
        class Program {
            static void Main(string[] args) {
    			Point p1 = new Point(1, 3);
    			Point p2 = new Point(4, 6);
    			Console.WriteLine("{0:F2}", p1 * p2);
    
    			Line line1 = new Line(p1, p2);
    			Line line2 = new Line(new Point(3, 5), new Point(12, 6));
    
    			Console.WriteLine(line1 | line2 ? "平行" : "不平行");
            }
        }
    }

注意：在进行运算符重载的时候最好保持运算符原有的含义，还有就是记得并非所有的运算符都可以重载，都需要重载。