重载操作符

$$重载操作符$$

1.索引器

索引器语法一般用于容器类的API，没有特别的好处，就是形式上简洁一些。

using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CSharp基础语法 { class MyArray { private int[] items; public MyArray(int capacity) { items = new int[capacity]; } public void SetItem(int i ,int val) { items[i] = val; } public int GetItem(int i) { return items[i]; } // 索引器 public int this[int index] { get { return items[index]; } set { items[index] = value; } } public int Size() { return this.items.Length; } } } using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CSharp基础语法 { class Program { static void Main(string[] args) { MyArray a = new MyArray(4); a[0] = 12; a[1] = 12; a[2] = 12; a[3] = 12; for(int i = 0; i < a.Size(); i++) { Console.WriteLine(a[i] + " "); } a.SetItem(0, 16); a.SetItem(0, 16); a.SetItem(0, 16); a.SetItem(0, 16); for (int i = 0; i < a.Size(); i++) { Console.WriteLine(a.GetItem(i) + " "); } Console.WriteLine("\n"); } } }

2.重载操作符

MyFraction f1 =new MyFraction(1, 3); MyFraction f2 = new MyFraction(2, 5); MyFraction result = f1 *f2; Console.WriteLine("结果: "+result);

MyFraction是一个类，也能支持乘法运算

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在C#里面，可以重载操作符，

public static MyFraction operator *(MyFraction a, MyFraction b){ MyFraction result = new MyFraction(); result.num = a.num " b.num; result.den = a.den * b.den; return result; }

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using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CSharp基础语法 { class MyFraction { public int num = 0; public int den = 1; public MyFraction() { } public MyFraction(int num ,int den) { this.num = num; this.den = den; } public override string ToString() { return num + "/" + den; } // 重载乘法操作符 public static MyFraction operator *(MyFraction a,MyFraction b) { MyFraction res = new MyFraction(); res.num = a.num * b.num; res.den = a.den * b.den; return res; } // 普通写法 public static MyFraction Multiply(MyFraction a, MyFraction b) { MyFraction res = new MyFraction(); res.num = a.num * b.num; res.den = a.den * b.den; return res; } } } using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; namespace CSharp基础语法 { class Program { static void Main(string[] args) { // 定义两个分数 1/3 和 2/5 MyFraction f1 = new MyFraction(1, 3); MyFraction f2 = new MyFraction(2, 5); // 相乘 MyFraction res = f1 * f2; Console.WriteLine("结果： " + res); } } }