C# list＜T＞去重

list＜T＞去重"/>

C# list＜T＞去重

文章目录

• C# list<T>去重
• • 值类型去重
  • • List<object>
    • • object is int
      • object is decimal
      • object is char
      • object is bool
      • object is string
    • List<int>
    • List<string>
  • 引用类型去重

C# list去重

值类型去重

List

object is int

//object is intList<object> ointList = new List<object>();ointList.Add(1);ointList.Add(1);ointList.Add(2);ointList = ointList.Distinct().ToList();

object is decimal

//object is decimalList<object> odecimalList = new List<object>();odecimalList.Add(1.25);odecimalList.Add(1.25);odecimalList.Add(2.25);odecimalList = odecimalList.Distinct().ToList();

object is char

            //object is charList<object> ocharList = new List<object>();ocharList.Add('a');ocharList.Add('a');ocharList.Add('b');ocharList = ocharList.Distinct().ToList();

object is bool

            //object is boolList<object> oboolList = new List<object>();oboolList.Add(true);oboolList.Add(false);oboolList.Add(true);oboolList = oboolList.Distinct().ToList();

object is string

            //object is stringList<object> osList = new List<object>();osList.Add("1");osList.Add("1");osList.Add("2");osList = osList.Distinct().ToList();

List

            List<int> intList = new List<int>();intList.Add(1111);intList.Add(1111);intList.Add(2222);intList = intList.Distinct().ToList();

List

            List<string> idList = new List<string>();idList.Add("1111");idList.Add("1111");idList.Add("2222");  idList = idList.Distinct().ToList();

引用类型去重

private class NetworkCtrl{#region <属性>/// <summary>/// 网控对象ID/// </summary>public string NetCtrlId { get; set; }/// <summary>/// 业务对象ID/// </summary>public string InterID { get; set; }/// <summary>/// 业务操作/// </summary>public string OperationDesc { get; set; }#endregion <属性>}

List<NetworkCtrl> ncList = new List<NetworkCtrl>();ncList.Add(new NetworkCtrl{InterID = "100148",NetCtrlId = "9cc2c432-56a9-b38d-11ee-794e3a9853e2",OperationDesc = "售后单-SH231103001-下推其它出库单"});ncList.Add(new NetworkCtrl{InterID = "100149",NetCtrlId = "9cc2c432-56a9-b38d-11ee-794e3a9853e2",OperationDesc = "售后单-SH231103002-下推其它出库单"});ncList.Add(new NetworkCtrl{InterID = "100148",NetCtrlId = "9cc2c432-56a9-b38d-11ee-794e3a9853e2",OperationDesc = "售后单-SH231103001-下推其它出库单"});var ncList1 = ncList.Distinct().ToList();var ncList2 = ncList.GroupBy(x => x.InterID).Select(y => y.First()).ToList();

集合里有三条记录，其中两条重复。

使用Distinct后，还有三条，说明distinct失败

原因是，引用类型即使属性一样，引用地址是不一样的。
只能用别的方式去避免。