要對自定義類數組或List進行排序，譬如：
List<User> userList;
ArrayList arrayList;
最重要的是：繼承IComparer<T>接口，實作int IComparer<T>.Compare(T t1, T t2)方法。
代碼如下：
/**//// <summary>
/// 繼承IComparer<T>接口，實作同一自定義類型 對象比較
/// </summary>
/// <typeparam name="T">T為泛用類型</typeparam>
public class Reverser<T> : IComparer<T>
...{
private Type type = null;
private ReverserInfo info;
/**//// <summary>
/// 構造函數
/// </summary>
/// <param name="type">進行比較的類類型</param>
/// <param name="name">進行比較對象的屬性名稱</param>
/// <param name="direction">比較方向(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;
}
/// <param name="className">進行比較的類名稱</param>
public Reverser(string className, string name, ReverserInfo.Direction direction) ...{
try
...{
this.type = Type.GetType(className, true);
this.info.name = name;
}
catch (Exception e)...{
throw new Exception(e.Message);
/// <param name="t">進行比較的類型的執行個體</param>
public Reverser(T t, string name, ReverserInfo.Direction direction)
this.type = t.GetType();
this.info.direction = direction;
//必須！實作IComparer<T>的比較方法。
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);
//交換操作數
private void Swap(ref object x, ref object y)
object temp = null;
temp = x;
x = y;
y = temp;
}
/// 對象比較時使用的資訊類
public struct ReverserInfo
/// 比較的方向，如下：
/// ASC：升序
/// DESC：降序
public enum Direction
ASC = 0,
DESC,
};
public enum Target
CUSTOMER = 0,
FORM,
FIELD,
SERVER,
public string name;
public Direction direction;
public Target target;
上面主要是運用了 C#的反射 和 Framework中的排序算法。
像上面那樣實作接口後，就可以使用List<T>進行 升序/降序 排序了。
測試代碼如下：
using System;
using System.Collections.Generic;
using System.Collections;
using System.Reflection;
using System.Text;
namespace List_T_SortTest_u_2
...{
測試Reverser代碼段#region 測試Reverser<T>代碼段
/// 實體類User，測試用
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; }
/// 主程式類(啟動類)，測試用
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");
user = new User("Liu", 26, "BeiJing");
user = new User("Zhao", 30, "ChaoYang");
user = new User("Yang", 27, "FuXin");
//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);
reverser = new Reverser<User>(user.GetType(), "Age", ReverserInfo.Direction.ASC);
Console.Read();
#endregion
}
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作者：靈動生活 郝憲玮
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