要对自定义类数组或List进行排序，譬如：
List<User> userList;
ArrayList arrayList;
最重要的是：继承IComparer<T>接口，实现int IComparer<T>.Compare(T t1, T t2)方法。
代码如下：
/// <summary>
/// 继承IComparer<T>接口，实现同一自定义类型 对象比较 /// </summary>
/// <typeparam name="T">T为泛用类型</typeparam>
public
class
Reverser
<
T
>
: IComparer
<
T
>
{ private Type type = null; private ReverserInfo info;
/// <summary> /// 构造函数 /// </summary> /// <param name="type">进行比较的类类型</param> /// <param name="name">进行比较对象的属性名称</param>
/// <param name="direction">比较方向(升序/降序)</param> public Reverser(Type type, string name, ReverserInfo.Direction direction) { this.type = type; this.info.name = name; if (direction != ReverserInfo.Direction.ASC) this.info.direction = direction; } /// <summary> /// 构造函数 /// </summary> /// <param name="className">进行比较的类名称</param> /// <param name="name">进行比较对象的属性名称</param> /// <param name="direction">比较方向(升序/降序)</param> public Reverser(string className, string name, ReverserInfo.Direction direction) { try { this.type = Type.GetType(className, true); this.info.name = name; this.info.direction = direction; } catch (Exception e){ throw new Exception(e.Message); } } /// <summary> /// 构造函数 /// </summary> /// <param name="t">进行比较的类型的实例</param> /// <param name="name">进行比较对象的属性名称</param> /// <param name="direction">比较方向(升序/降序)</param> public Reverser(T t, string name, ReverserInfo.Direction direction) { this.type = t.GetType(); this.info.name = name; this.info.direction = direction; } //必须！实现IComparer<T>的比较方法。 int IComparer<T>.Compare(T t1, T t2) { object x = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t1, null); object y = this.type.InvokeMember(this.info.name, BindingFlags.Public | BindingFlags.Instance | BindingFlags.GetProperty, null, t2, null); if (this.info.direction != ReverserInfo.Direction.ASC) Swap(ref x, ref y); return (new CaseInsensitiveComparer()).Compare(x, y); } //交换操作数 private void Swap(ref object x, ref object y) { object temp = null; temp = x; x = y; y = temp; } }
/// <summary> /// 对象比较时使用的信息类 /// </summary>
public
struct
ReverserInfo
{ /// <summary> /// 比较的方向，如下： /// ASC：升序 /// DESC：降序 /// </summary> public enum Direction { ASC = 0, DESC, }; public enum Target { CUSTOMER = 0, FORM, FIELD, SERVER, }; public string name; public Direction direction; public Target target; }
上面主要是运用了 C#的反射 和 Framework中的排序算法。
像上面那样实现接口后，就可以使用List<T>进行 升序/降序 排序了。
测试代码如下：
using
System;
using
System.Collections.Generic;
using
System.Collections;
using
System.Reflection;
using
System.Text;
namespace
List_T_SortTest_u_2
{ #region 测试Reverser<T>代码段 /// <summary> /// 实体类User，测试用 /// </summary> public class User { protected string _name; protected int _age; protected string _address; public User(string name, int age, string address) { this._name = name; this._age = age; this._address = address; } public string Name { get { return _name; } set { _name = value; } } public int Age { get { return _age; } set { _age = value; } } public string Address { get { return _address; } set { _address = value; } } } /// <summary> /// 主程序类(启动类)，测试用 /// </summary> class Program { static void Main(string[] args) { List<User> userList = new List<User>(); User user; user = new User("Wang", 21, "ShenYang"); userList.Add(user); user = new User("Yan", 27, "JinZhou"); userList.Add(user); user = new User("Liu", 26, "BeiJing"); userList.Add(user); user = new User("Zhao", 30, "ChaoYang"); userList.Add(user); user = new User("Yang", 27, "FuXin"); userList.Add(user); //for (int i = 0; i < ar.Count; i++ ) // ; Console.Write("Name "); Console.Write("Age "); Console.Write("Address " + " " + " "); Console.WriteLine("-----------------------"); foreach (User u in userList) { Console.Write(u.Name + " "); Console.Write(u.Age + " "); Console.Write(u.Address + " " + " "); } Console.WriteLine(); Reverser<User> reverser = new Reverser<User>(user.GetType(), "Name", ReverserInfo.Direction.DESC); userList.Sort(reverser); Console.WriteLine(); foreach (User u in userList) { Console.Write(u.Name + " "); Console.Write(u.Age + " "); Console.Write(u.Address + " " + " "); } Console.WriteLine(); reverser = new Reverser<User>(user.GetType(), "Age", ReverserInfo.Direction.ASC); userList.Sort(reverser); Console.WriteLine(); foreach (User u in userList) { Console.Write(u.Name + " "); Console.Write(u.Age + " "); Console.Write(u.Address + " " + " "); } Console.Read(); } } #endregion}
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作者：灵动生活 郝宪玮
出处：http://www.cnblogs.com/ywqu
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