通过一个静态的实例list，每次系统登录的时候首先检查登录人loinguser是否在list中，如果loginuser不在list中，则将loginuser加到list中去。当Session超时或用户离开系统的时候，将其从list中删除
1
using System;
2using System.Collections.Generic;
3using System.Text;
4
5//===========================================
6//File: LoginUserList.cs
7//Date: 2007-12-10
8//Author: liuqhui
9//Desc: LoginUserList class
10//============================================
11
12namespace BLL
13
{
14
public class LoginUserList
15
{
16 private static LoginUserList _instance = new LoginUserList();
17
18 private IList<string> list = new List<string>();
19
20 private LoginUserList() { }
21
22 public static LoginUserList Instance{
23 get { return _instance; }
24
}
25
26 public bool AddUser(string name) {
27 if (list.Contains(name))
28 return false;
29 else {
30 list.Add(name);
31
32 return true;
33 }
34 }
35
36 public void RemoveUser(string name) {
37 list.Remove(name);
38 }
39
40 public void PurgeUsers() {
41 list.Clear();
42 }
43 }
44
}
45
using System;2
using System.Collections.Generic;3
using System.Text;4
5
//===========================================6
//File: LoginUserList.cs7
//Date: 2007-12-108
//Author: liuqhui9
//Desc: LoginUserList class10
//============================================11
12
namespace BLL13
{
14
public class LoginUserList15
{
16
private static LoginUserList _instance = new LoginUserList();17
18
private IList<string> list = new List<string>();19
20
private LoginUserList() { }21
22
public static LoginUserList Instance{23
get { return _instance; }24
}25
26
public bool AddUser(string name) {27
if (list.Contains(name))28
return false;29
else {30
list.Add(name);31
32
return true;33
}34
}35
36
public void RemoveUser(string name) {37
list.Remove(name);38
}39
40
public void PurgeUsers() {41
list.Clear();42
}43
}44
}45