Application--在线统计人数

 1  void Application_Start(object sender, EventArgs e)
 2     {
 3         //在应用程序启动时运行的代码
 4          Application["Count"] = 0;
 5         System.IO.FileStream fs = System.IO.File.Open(Server.MapPath("Count.txt"), System.IO.FileMode.OpenOrCreate);
 6         System.IO.StreamReader sr = new System.IO.StreamReader(fs);
 7         Application["AllUsers"] = Convert.ToInt32(sr.ReadLine());
 8         sr.Close();
 9         fs.Close();
10     }
11     void Application_End(object sender, EventArgs e)
12     {
13         //在应用程序关闭时运行的代码
14  
15     }
16     void Application_Error(object sender, EventArgs e)
17     {
18         //在出现未处理的错误时运行的代
19 
20     }
21     void Session_Start(object sender, EventArgs e)
22     {
23         //在新会话启动时运行的代码
24         Application.Lock();
25         Application["Count"] = Convert.ToInt32(Application["Count"]) + 1;
26         Application["AllUsers"] = Convert.ToInt32(Application["AllUsers"]) + 1;
27         System.IO.FileStream fs = new System.IO.FileStream("Count.txt", System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.ReadWrite);
28         System.IO.StreamWriter sw = new System.IO.StreamWriter(fs);
29         sw.WriteLine(Application["AllUsers"]);
30         sw.Close();
31         fs.Close();
32         Application.UnLock();
33     }
34 
35     void Session_End(object sender, EventArgs e)
36     {
37         Application.Lock();
38         Application["Count"] = Convert.ToInt32(Application["Count"]) - 1;
39         Application.UnLock();
40 
41     }