.NET 4新特性——數組、元組比較

標籤：比較   c#數組比較   c#元組比較   

==============================================數組自訂比較

------------------------------------------------------------Person.cs

 using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading.Tasks;using System.Collections;namespace ConsoleApplication4{    public class Person:IEquatable<Person>//繼承IEquatable泛型介面    {        public int Id { get; set; }//屬性id，沒什麼實際意義        public string FirstName { get; set; }        public string LastName { get; set; }        public override string ToString()        {            return string.Format("FirstName:{0},LastName:{1}", FirstName, LastName);        }        public override bool Equals(object obj)        {            if (obj == null) throw new ArgumentException("error");            return Equals(obj as Person);        }        public override int GetHashCode()//伴隨著  重寫的Equals        {            return Id.GetHashCode();        }        public bool Equals(Person other)//重要        {            return this.FirstName == other.FirstName;//自訂要比對的值（只比對FirstName）        }    }}

------------------------------------------------------------主程式

  Person p1 = new Person { FirstName = "曹操", LastName = "程昱" };            Person p2 = new Person { FirstName = "曹操", LastName = "荀攸" };            Person p3 = new Person { FirstName = "曹操", LastName = "關羽" };            Person p4 = new Person { FirstName = "劉備", LastName = "關羽" };            Person[] ps1 = { p1, p2 };            Person[] ps2 = { p1, p3 };            Person[] ps3 = { p3, p4 };            //            把數組強制裝換成IStructuralEquatable介面              Console.WriteLine((ps1 as IStructuralEquatable).Equals(ps2, EqualityComparer<Person>.Default));//True            Console.WriteLine((ps2 as IStructuralEquatable).Equals(ps3, EqualityComparer<Person>.Default));//False            Console.ReadKey();

==============================================元組比較

            var tuple1 = Tuple.Create<int, int>(1, 2);            var tuple2 = Tuple.Create<int, int>(1, 2);            Console.WriteLine(tuple1.Equals(tuple2));//True            Console.WriteLine(tuple1==tuple2);//False            Console.ReadKey();

 

本文出自 “程式猿的家” 部落格，請務必保留此出處http://962410314.blog.51cto.com/7563109/1531758