C#中Dictionary排序方式

转载自：https://www.cnblogs.com/5696-an/p/5625142.html

自定义类：

 https://files.cnblogs.com/files/xunhanliu/d3.v4.js

 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,自定义类>

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 = "张三";
             cn1.stuAge = ;
             cn1.stuSex = "男";
             cn1.stuScore = 89.5;

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

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

             Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
             dic1.Add(, cn1);
             dic1.Add(, cn2);
             dic1.Add(, cn3);
             //上面dic1.Add()故意不按照顺序

             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);
结果截图：

降序排序：

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

结果截图：

按照Dictionary的Value值的某个属性 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 = "张三";
             cn1.stuAge = ;
             cn1.stuSex = "男";
             cn1.stuScore = 89.5;

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

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

             Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
             dic1.Add(, cn1);
             dic1.Add(, cn2);
             dic1.Add(, cn3);
             //上面dic1.Add()故意不按照顺序
             //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属性
             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();
         }
     }
 }

关键修改这句：

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

结果截图：

混合排序：类似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 = "张三";
             cn1.stuAge = ;
             cn1.stuSex = "男";
             cn1.stuScore = 89.5;

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

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

             Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>();
             dic1.Add(, cn1);
             dic1.Add(, cn2);
             dic1.Add(, cn3);
             //上面dic1.Add()故意不按照顺序
             //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属性
             //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语句
             //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuScore).ThenByDescending(o=>o.Value.stuAge).ToDictionary(p=>p.Key,o=>o.Value);

             //linq语句
             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语句：

var dic1_SortedByKey = from n in dic1

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

select n;

结果截图：