Three ways to remove weight from C # list

Reprint to: 46839793

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

[CSharp]View PlainCopy

2. Using System;
4. Using System.Collections.Generic;
6. Using System.Linq;
10. Namespace Nonduplicatelist
12. {
14. Class Program
16. {
18. static void Main (string[] args)
20. {
22. list<user> users = new list<user> ();
24. Users.  ADD (new User ("Zhang San", "Yongfeng road No. 299"));
26. Users. ADD (new User ("Zhang San", "8th on West Road")); Duplicates, which will be deleted when the weight is removed.
28. Users.  ADD (new User ("John Doe", "Sea Eagle Road Armour One"));
32. List<user> nonDuplicateList1 = users. Distinct (). ToList (); //Through the Equals of the user class to achieve the weight
34. List<user> nonDuplicateList2 = users. Where ((x,i) =>users. FindIndex (Z=>z.name = = x.name) = = i). ToList (); //lambda expression de-weight
36. list<user> nonDuplicateList3 = new list<user> (); To weigh in a circular way
38. foreach (user user in users)
40. {
42. if (nonduplicatelist3.exists (x=>x.name==user.name) = = false)
44. {
46. Nonduplicatelist3.add (user);
48. }
50. }
54. foreach (list<user> List in new OBJECT[]{NONDUPLICATELIST1,NONDUPLICATELIST2,NONDUPLICATELIST3}) //Print out three elements of list
56. {
58. Console.Write ("nonduplicatelist:\r\n");
60. foreach (User u in list)
62. {
64. Console.WriteLine ("\ T" + u.tostring ());
66. }
68. }
70. Console.read ();
72. }
74. }
78. class user:iequatable<user>//inherits the IEquatable interface, implementing the Equals method. List can use distinct to go to heavy
80. {
82. public string name { get;  set;}
84. string Address;
88. Public User (string _name, string _address)
90. {
92. name = _name;
94. address = _address;
96. }
100. public Override string ToString ()
102. {
104. return string.  Format ("Name:{0},\taddress:{1}", name, address);
106. }
110. Public bool Equals (User other)
112. {
114. return this.name = = Other.name;
116. }
118. public override int GetHashCode ()
120. {
122. return name.  GetHashCode ();
124. }
126. }
128. }

Three ways to remove weight from C # list