C # List of three ways to Redo (go)

Three ways to de-weigh

1. The elements in the list implement the Iequatabe interface and provide the Equals method and the GetHashCode method.

2. Using expressions

Users. Where ((x,i) =>users. FindIndex (Z=>z.name = = x.name) = = i)  

Go heavy, this statement returns the result only the first of the duplicate elements in the list (name equals is considered duplicates).

3. Use loops to determine if each element repeats

usingSystem; usingSystem.Collections.Generic; usingSystem.Linq; namespaceNonduplicatelist {classProgram {Static voidMain (string[] args) {List<User> users =NewList<user>(); Users. ADD (NewUser ("Zhang San","No. No. 299 Yongfeng Road")); Users. ADD (NewUser ("Zhang San","No. 8th, Shang Xi Road"));//duplicates, which will be deleted when the weight is removed.Users. ADD (NewUser ("John Doe","Sea Eagle Road Armour one")); List<User> nonDuplicateList1 = users. Distinct (). ToList ();//using the equals of the user class to achieve the weightList<user> nonDuplicateList2 = users. Where ((x,i) =>users. FindIndex (Z=>z.name = = x.name) = = i). ToList ();//lambda expression de-weightList<user> NonDuplicateList3 =NewList<user> ();//to weigh in a circular way            foreach(User Userinchusers) {                  if(Nonduplicatelist3.exists (x=>x.name==user.name) = =false) {nonduplicatelist3.add (user); }              }                foreach(List<user> Listinch NewOBJECT[]{NONDUPLICATELIST1,NONDUPLICATELIST2,NONDUPLICATELIST3})//print out three elements of a list{Console.Write ("nonduplicatelist:\r\n"); foreach(User uinchlist) {Console.WriteLine ("\ t"+u.tostring ());          }} console.read (); }      }        classUser:iequatable<user>//inherit the IEquatable interface to implement the Equals method. List can use distinct to go to heavy    {           Public stringName {Get;Set; } stringaddress;  PublicUser (string_name,string_address) {Name=_name; Address=_address; }             Public Override stringToString () {return string. Format ("Name:{0},\taddress:{1}", name, address); }             Public BOOLEquals (User other) {return  This. Name = =Other.name; }           Public Override intGetHashCode () {returnname.          GetHashCode (); }      }  }  

Original: http://blog.csdn.net/wangguanguo/article/details/46839793

C # List of three ways to Redo (go)