C#中Dictionary<TKey,TValue>排序方式的實現(xiàn)

更新時間：2021年02月26日 10:32:45 作者：浮海揚塵

這篇文章主要介紹了C#中Dictionary<TKey,TValue>排序方式的實現(xiàn)，文中通過示例代碼介紹的非常詳細(xì)，對大家的學(xué)習(xí)或者工作具有一定的參考學(xué)習(xí)價值，需要的朋友們下面隨著小編來一起學(xué)習(xí)學(xué)習(xí)吧

自定義類：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharp中Dictionary排序方式
{
  [Serializable]
  public class CustmonizedClass
  {
    public string stuＮame { get; set; }

    public int stuAge { get; set; }

    public string stuSex { get; set; }

    public double stuScore { get; set; }
    
  }
}

Dictionary<int,自定義類>

按照Dictionary的Key值升序排序(OrderBy)、降序排序(OrderByDescending)：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharp中Dictionary排序方式
{
   public class Program
  {
    static void Main(string[] args)
    {
      CustmonizedClass cn1 = new CustmonizedClass();
      cn1.stuＮame = "張三";
      cn1.stuAge = 18;
      cn1.stuSex = "男";
      cn1.stuScore = 89.5;

      CustmonizedClass cn2 = new CustmonizedClass();
      cn2.stuＮame = "李四";
      cn2.stuAge = 19;
      cn2.stuSex = "男";
      cn2.stuScore = 88.5;


      CustmonizedClass cn3 = new CustmonizedClass();
      cn3.stuＮame = "王五";
      cn3.stuAge = 17;
      cn3.stuSex = "女";
      cn3.stuScore = 89.5;

      Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
      dic1.Add(3, cn1);
      dic1.Add(1, cn2);
      dic1.Add(2, cn3);
      //上面dic1.Add()故意不按照順序

      Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value);
      

      foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 
      {
        Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ",
          item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore);
      }
      Console.ReadLine();            
    }
  }
}

Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value);

結(jié)果截圖：

降序排序：

Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, o => o.Value);

結(jié)果截圖：

按照Dictionary的Value值的某個屬性升序排序(OrderBy)、降序排序(OrderByDescending)：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharp中Dictionary排序方式
{
   public class Program
  {
    static void Main(string[] args)
    {
      CustmonizedClass cn1 = new CustmonizedClass();
      cn1.stuＮame = "張三";
      cn1.stuAge = 18;
      cn1.stuSex = "男";
      cn1.stuScore = 89.5;

      CustmonizedClass cn2 = new CustmonizedClass();
      cn2.stuＮame = "李四";
      cn2.stuAge = 19;
      cn2.stuSex = "男";
      cn2.stuScore = 88.5;


      CustmonizedClass cn3 = new CustmonizedClass();
      cn3.stuＮame = "王五";
      cn3.stuAge = 17;
      cn3.stuSex = "女";
      cn3.stuScore = 89.5;

      Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
      dic1.Add(3, cn1);
      dic1.Add(1, cn2);
      dic1.Add(2, cn3);
      //上面dic1.Add()故意不按照順序
      //Key升序
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value);
      //Key降序
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, o => o.Value);
      //Value中stuAge屬性
      Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuAge).ToDictionary(p => p.Key, o => o.Value);

      foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 
      {
        Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ",
          item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore);
      }
      Console.ReadLine();            
    }
  }
}

關(guān)鍵修改這句：

Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuAge).ToDictionary(p=>p.Key,o=>o.Value);

結(jié)果截圖：

混合排序：類似EXCEL中先按第一列升序、再按第3列的升序……

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace CSharp中Dictionary排序方式
{
   public class Program
  {
    static void Main(string[] args)
    {
      CustmonizedClass cn1 = new CustmonizedClass();
      cn1.stuＮame = "張三";
      cn1.stuAge = 18;
      cn1.stuSex = "男";
      cn1.stuScore = 89.5;

      CustmonizedClass cn2 = new CustmonizedClass();
      cn2.stuＮame = "李四";
      cn2.stuAge = 19;
      cn2.stuSex = "男";
      cn2.stuScore = 88.5;


      CustmonizedClass cn3 = new CustmonizedClass();
      cn3.stuＮame = "王五";
      cn3.stuAge = 17;
      cn3.stuSex = "女";
      cn3.stuScore = 89.5;

      Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
      dic1.Add(3, cn1);
      dic1.Add(1, cn2);
      dic1.Add(2, cn3);
      //上面dic1.Add()故意不按照順序
      //Key升序
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value);
      //Key降序
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, o => o.Value);
      //Value中stuAge屬性
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuAge).ToDictionary(p => p.Key, o => o.Value);
      //混合排序 等同于下列的linq語句
      //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuScore).ThenByDescending(o=>o.Value.stuAge).ToDictionary(p=>p.Key,o=>o.Value);

      //linq語句
      var dic1_SortedByKey = from n in dic1

             orderby n.Value.stuScore, n.Value.stuAge descending

             select n;

      foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 
      {
        Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ",
          item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore);
      }
      Console.ReadLine();            
    }
  }
}

Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuScore).ThenByDescending(o=>o.Value.stuAge).ToDictionary(p=>p.Key,o=>o.Value);

等同于linq語句：

var dic1_SortedByKey = from n in dic1

orderby n.Value.stuScore, n.Value.stuAge descending

select n;

結(jié)果截圖：

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