C# Dictionary（字典）的键、值排序进行值排序可以用LINQ

最新推荐文章于 2024-09-09 08:45:37 发布

转载最新推荐文章于 2024-09-09 08:45:37 发布 · 1.1k 阅读

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#C# #LINQ #dictionary

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本文介绍如何利用LINQ对C#中的Dictionary<TKey, TValue>类型按值或键进行升序或降序排序，并提供了具体的代码示例。

对一个Dictionary<TKey, TValue>进行值排序可以用LINQ：  
  
Dictionary<string, string> MyDictionary = new Dictionary<string, string>();  
  
MyDictionary = (from entry in MyDictionary   
                                     orderby entry.Value ascending  
                                     select entry).ToDictionary(pair => pair.Key, pair => pair.Value);

Dictionary<string, string> dic1 = new Dictionary<string, string>();

      dic1.Add("ddd","123");
      dic1.Add("aaa", "123");
      dic1.Add("ccc", "123");
      dic1.Add("fff", "123");
      dic1.Add("eee", "123");
      dic1.Add("bbb", "123");
      Dictionary<string, string> dic1Asc = dic1.OrderBy(o => o.Key).ToDictionary(o => o.Key, p => p.Value);
      Dictionary<string, string> dic1desc = dic1.OrderByDescending(o => o.Key).ToDictionary(o => o.Key, p => p.Value);

      Dictionary<string, string> dic1Asc1
        = (from d in dic1
           orderby d.Key ascending
           select d).ToDictionary(k => k.Key, v => v.Value);
      Dictionary<string, string> dic1desc2
        = (from d in dic1
           orderby d.Key descending 
           select d).ToDictionary(k => k.Key, v => v.Value);


      List<string> list = new List<string>();
      list.Add("aaa");
      list.Add("ddd");
      list.Add("bbb");
      list.Add("ccc");
      list.Add("bbb");
      var ascList = list.OrderBy(o => o);
      var descList = list.OrderByDescending(o => o);

      var ascList1 = (from l in list
                      orderby l ascending
                      select l).ToList();
      var descList2 = (from l in list
                       orderby l descending
                       select l).ToList();
      string str = "";