C#中Dictionary＜TKey,TValue＞排序方式

MonoBehaviour

墨衍会员 · AI 创作全网分发码龄10年

关注

转载最新推荐文章于 2026-08-31 07:00:00 发布 898 阅读 AI 写同款· GEO 优化 ›

C# 字典（Dictionary）基本操作注意：在字典中，键是唯一的，不能有重复的键；同时，字典内部通常采用哈希表实现，因此查找、添加和删除操作的时间复杂度通常是O(1)。九、C# 8.0 及以上版本还引入了。阅读详情

C#中Dictionary<TKey,TValue>排序方式

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
{
    [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 = 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)：

View Code

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……

View Code

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：