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  • C# Distinct去重泛型List

    • List<int>去重
    • List<string>去重
    • List<T>去重

    1. List<int>去重

     List<int> ilist = new List<int>() { 1, 2, 3, 4, 2, 3 };
     ilist = ilist.Distinct().ToList();
     foreach (var item in ilist)
     {
        Console.WriteLine(item);
     }
    

    2. List<string>去重

     List<string> strList = new List<string>() { "4", "4", "5", "6", "6" };
     strList = strList.Distinct().ToList();
     foreach (var item in strList)
     {
        Console.WriteLine(item);
     }
    

    3. List<T>去重

     public class User
     {
       public int Id { get; set; }
       public string Name { get; set; }
       public int Age { get; set;}
     }
    
    //Main方法
     List<User> list = new List<User>() 
     { 
        new User() { Id = 1, Name = "张三", Age = 11 } ,
        new User() { Id = 1, Name = "张三", Age = 11} ,
        new User() { Id = 3, Name = "李四", Age = 13 } ,
     };
     //方法一
     list = list.GroupBy(p => p.Id).Select(q => q.First()).ToList();
     //方法二
     list = list.GroupBy(p => p.Name).Select(q => q.First()).ToList();
     //方法三
     list = list.GroupBy(p => p.Age).Select(q => q.First()).ToList();
     foreach (var item in list)
     {
       Console.WriteLine("Id:" + item.Id + ", Name:" + item.Name + ", Age:" + item.Age);
     }
     //方法四
     var list1 = (from p in list
                  group p by new { p.Id, p.Name, p.Age } into g
                  select g).ToList();
     foreach (var item in list1)
     {
        Console.WriteLine("Id:" + item.Key.Id + ", Name:" + item.Key.Name + ", Age:" + item.Key.Age);
     }
    

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  • 原文地址:https://www.cnblogs.com/LuckyZLi/p/11888239.html
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