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：

C#中Dictionary排序方式的相关教程结束。