. NET 4 new features-arrays, tuple comparisons

============================================== Array Custom Comparison

------------------------------------------------------------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>//inherit IEquatable generic interface      {        public int Id { get; set;  }//attribute ID, no real meaning         public string firstname {  get; set; }        public string lastname  { get; set; }        public override  String tostring ()         {             return string. Format ("Firstname:{0},lastname:{1}",  firstname, lastname);    &nBsp;    }        public override bool  equals (object obj)         {             if  (obj == null)  throw new  ArgumentException ("error");             return  equals (Obj as person);        }         public override int gethashcode ()//accompanied by    rewrite equals         {             return id.gethashcode ();        }         public bool equals (Person other)//Important          {    &Nbsp;       return this. Firstname == other. firstname;//the value of the custom pair (only compared to FirstName)         }    }}

------------------------------------------------------------Main program

  Person p1 = new Person { FirstName =  "Caocao",  lastname  =  "Cheng Yufan"  };            Person  p2 = new person { firstname =  "Cao", lastname =  "Zhow"  };             Person p3 = new  person { firstname =  "Cao", lastname =  "Guan Yu"  };             Person p4 = new Person {  firstname =  "Liu Bei", lastname =  "Guan Yu"  };             Person[] ps1 = { p1, p2 };             Person[] ps2 = { p1, p3 };             person[] ps3 = { p3, p4 };             //              Force an array to be loaded into the IStructuralEquatable interface                console.writeline ((ps1 as istructuralequatable). Equals (PS2, EQUALITYCOMPARER<PERSON>. Default);//true            console.writeline (PS2  as istructuralequatable). Equals (PS3, EQUALITYCOMPARER<PERSON>. Default);//false            console.readkey ();

============================================== Meta-group comparison

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 ();

This article is from the "Program Ape's Home" blog, please be sure to keep this source http://962410314.blog.51cto.com/7563109/1531758