C#中Dictionary排序方式
转载自：https://www.cnblogs.com/5696-an/p/5625142.html
自定义类：
1 https://files.cnblogs.com/files/xunhanliu/d3.v4.js 2 3 using System; 4 using System.Collections.Generic; 5 using System.Linq; 6 using System.Text; 7 using System.Threading.Tasks; 8 9 namespace CSharp中Dictionary排序方式 10 { 11 [Serializable] 12 public class CustmonizedClass 13 { 14 public string stuＮame { get; set; } 15 16 public int stuAge { get; set; } 17 18 public string stuSex { get; set; } 19 20 public double stuScore { get; set; } 21 22 } 23 }
Dictionary<int,自定义类>
按照Dictionary的Key值 升序排序(OrderBy)、降序排序(OrderByDescending)：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 7 namespace CSharp中Dictionary排序方式 8 { 9 public class Program 10 { 11 static void Main(string[] args) 12 { 13 CustmonizedClass cn1 = new CustmonizedClass(); 14 cn1.stuＮame = "张三"; 15 cn1.stuAge = 18; 16 cn1.stuSex = "男"; 17 cn1.stuScore = 89.5; 18 19 CustmonizedClass cn2 = new CustmonizedClass(); 20 cn2.stuＮame = "李四"; 21 cn2.stuAge = 19; 22 cn2.stuSex = "男"; 23 cn2.stuScore = 88.5; 24 25 26 CustmonizedClass cn3 = new CustmonizedClass(); 27 cn3.stuＮame = "王五"; 28 cn3.stuAge = 17; 29 cn3.stuSex = "女"; 30 cn3.stuScore = 89.5; 31 32 Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>(); 33 dic1.Add(3, cn1); 34 dic1.Add(1, cn2); 35 dic1.Add(2, cn3); 36 //上面dic1.Add()故意不按照顺序 37 38 Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value); 39 40 41 foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 42 { 43 Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ", 44 item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore); 45 } 46 Console.ReadLine(); 47 } 48 } 49 }
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)：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 7 namespace CSharp中Dictionary排序方式 8 { 9 public class Program 10 { 11 static void Main(string[] args) 12 { 13 CustmonizedClass cn1 = new CustmonizedClass(); 14 cn1.stuＮame = "张三"; 15 cn1.stuAge = 18; 16 cn1.stuSex = "男"; 17 cn1.stuScore = 89.5; 18 19 CustmonizedClass cn2 = new CustmonizedClass(); 20 cn2.stuＮame = "李四"; 21 cn2.stuAge = 19; 22 cn2.stuSex = "男"; 23 cn2.stuScore = 88.5; 24 25 26 CustmonizedClass cn3 = new CustmonizedClass(); 27 cn3.stuＮame = "王五"; 28 cn3.stuAge = 17; 29 cn3.stuSex = "女"; 30 cn3.stuScore = 89.5; 31 32 Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>(); 33 dic1.Add(3, cn1); 34 dic1.Add(1, cn2); 35 dic1.Add(2, cn3); 36 //上面dic1.Add()故意不按照顺序 37 //Key升序 38 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value); 39 //Key降序 40 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, o => o.Value); 41 //Value中stuAge属性 42 Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuAge).ToDictionary(p => p.Key, o => o.Value); 43 44 foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 45 { 46 Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ", 47 item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore); 48 } 49 Console.ReadLine(); 50 } 51 } 52 }
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……
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 using System.Threading.Tasks; 6 7 namespace CSharp中Dictionary排序方式 8 { 9 public class Program 10 { 11 static void Main(string[] args) 12 { 13 CustmonizedClass cn1 = new CustmonizedClass(); 14 cn1.stuＮame = "张三"; 15 cn1.stuAge = 18; 16 cn1.stuSex = "男"; 17 cn1.stuScore = 89.5; 18 19 CustmonizedClass cn2 = new CustmonizedClass(); 20 cn2.stuＮame = "李四"; 21 cn2.stuAge = 19; 22 cn2.stuSex = "男"; 23 cn2.stuScore = 88.5; 24 25 26 CustmonizedClass cn3 = new CustmonizedClass(); 27 cn3.stuＮame = "王五"; 28 cn3.stuAge = 17; 29 cn3.stuSex = "女"; 30 cn3.stuScore = 89.5; 31 32 Dictionary<int, CustmonizedClass> dic1 = new Dictionary<int, CustmonizedClass>(); 33 dic1.Add(3, cn1); 34 dic1.Add(1, cn2); 35 dic1.Add(2, cn3); 36 //上面dic1.Add()故意不按照顺序 37 //Key升序 38 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(p=>p.Key).ToDictionary(p => p.Key, o => o.Value); 39 //Key降序 40 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderByDescending(p => p.Key).ToDictionary(p => p.Key, o => o.Value); 41 //Value中stuAge属性 42 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuAge).ToDictionary(p => p.Key, o => o.Value); 43 //混合排序 等同于下列的linq语句 44 //Dictionary<int, CustmonizedClass> dic1_SortedByKey = dic1.OrderBy(o => o.Value.stuScore).ThenByDescending(o=>o.Value.stuAge).ToDictionary(p=>p.Key,o=>o.Value); 45 46 //linq语句 47 var dic1_SortedByKey = from n in dic1 48 49 orderby n.Value.stuScore, n.Value.stuAge descending 50 51 select n; 52 53 foreach (KeyValuePair<int, CustmonizedClass> item in dic1_SortedByKey) 54 { 55 Console.WriteLine("Key:{0} ; Value: name:{1}, age:{2}, sex:{3}, score:{4} ", 56 item.Key,item.Value.stuＮame,item.Value.stuAge,item.Value.stuSex,item.Value.stuScore); 57 } 58 Console.ReadLine(); 59 } 60 } 61 }
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：
