c# list排序的三种实现方式

c# list排序的三种实现方式

用了一段时间的gridview，对gridview实现的排序功能比较好奇，而且利用C#自带的排序方法只能对某一个字段进行排序，今天demo了一下，总结了三种对list排序的方法，并实现动态传递字段名对list进行排序。

首先先介绍一下平时最常用的几种排序方法。

第一种：实体类实现IComparable接口，而且必须实现CompareTo方法

实体类定义如下：

View Code

1 class Info:IComparable
2     {
3         public int Id { get; set; }
4         public string Name { get; set; }
5
6         public int CompareTo(object obj) {
7             int result;
8             try
9             {
10                 Info info = obj as Info;
11                 if (this.Id > info.Id)
12                 {
13                     result = 0;
14                 }
15                 else
16                     result = 1;
17                 return result;
18             }
19             catch (Exception ex) { throw new Exception(ex.Message); }
20         }
21     }

View Code

1 private static void ReadAccordingCompare() {
2             List<Info> infoList = new List<Info>();
3             infoList.Add(
4                 new Info() { Id = 1, Name = "abc" });
5             infoList.Add(new Info() { Id = 3, Name = "rose" });
6             infoList.Add(new Info() { Id = 2, Name = "woft" });
7                infoList.Sort();
8             foreach (var item in infoList)
9             {
10                 Console.WriteLine(item.Id + ":" + item.Name);
11             }
12         }

View Code

1 private static void ReadT(string str) {
2             List<Info> infoList = new List<Info>();
3             infoList.Add(
4                 new Info() { Id = 1, Name = "woft" });
5             infoList.Add(new Info() { Id=3,Name="rose"});
6             infoList.Add(new Info() { Id = 2, Name = "abc" });
7             Console.WriteLine("ReadT*********************");
8             IEnumerable<Info> query = null;
9             query = from items in infoList orderby items.Id select items;
10             foreach (var item in query)
11             {
12                 Console.WriteLine(item.Id+":"+item.Name);
13             }
14         }

View Code

1 private static void ListSort(string field,string rule)
2         {
3             if (!string.IsNullOrEmpty(rule)&&(!rule.ToLower().Equals("desc")||!rule.ToLower().Equals("asc")))
4             {
5                 try
6                 {
7                     List<Info> infoList = GetList();
8                     infoList.Sort(
9                         delegate(Info info1, Info info2)
10                         {
11                             Type t1 = info1.GetType();
12                             Type t2 = info2.GetType();
13                             PropertyInfo pro1 = t1.GetProperty(field);
14                             PropertyInfo pro2 = t2.GetProperty(field);
15                             return rule.ToLower().Equals("asc") ?
16                                 pro1.GetValue(info1, null).ToString().CompareTo(pro2.GetValue(info2, null).ToString()) :
17                                 pro2.GetValue(info2, null).ToString().CompareTo(pro1.GetValue(info1, null).ToString());
18                         });
19                     Console.WriteLine("*****ListSort**********");
20                     foreach (var item in infoList)
21                     {
22                         Console.WriteLine(item.Id + "," + item.Name);
23                     }
24                 }
25                 catch (Exception ex)
26                 {
27                     Console.WriteLine(ex.Message);
28                 }
29             } Console.WriteLine("ruls is wrong");
30
31         }

 1 private static void ListSort(string field,string rule)
2         {
3             if (!string.IsNullOrEmpty(rule)&&(!rule.ToLower().Equals("desc")||!rule.ToLower().Equals("asc")))
4             {
5                 try
6                 {
7                     List<Info> infoList = GetList();
8                     infoList.Sort(
9                         delegate(Info info1, Info info2)
10                         {
11                             Type t1 = info1.GetType();
12                             Type t2 = info2.GetType();
13                             PropertyInfo pro1 = t1.GetProperty(field);
14                             PropertyInfo pro2 = t2.GetProperty(field);
15                             return rule.ToLower().Equals("asc") ?
16                                 pro1.GetValue(info1, null).ToString().CompareTo(pro2.GetValue(info2, null).ToString()) :
17                                 pro2.GetValue(info2, null).ToString().CompareTo(pro1.GetValue(info1, null).ToString());
18                         });
19                     Console.WriteLine("*****ListSort**********");
20                     foreach (var item in infoList)
21                     {
22                         Console.WriteLine(item.Id + "," + item.Name);
23                     }
24                 }
25                 catch (Exception ex)
26                 {
27                     Console.WriteLine(ex.Message);
28                 }
29             } Console.WriteLine("ruls is wrong");
30
31         }

调用方式：

ListSort("Name","desc");//表示对Name进行desc排序
ListSort("Id","asc");//表示对Id进行asc排序。如此如果参数很多的话减少了很多判断。

如果有更好的方法欢迎提出，共同学习………..