asp教程.net 在线人数统计代码
application最经典的一个方法:统计在线人数,这需要借助于我们的全局应用程序类来对登录的用户信息进行统计:
void application_start(object sender, eventargs e)
{
//在应用程序启动时运行的代码
application["count"] = 0;
system.io.filestream fs = system.io.file.open(server.mappath("count.txt"), system.io.filemode.openorcreate);
system.io.streamreader sr = new system.io.streamreader(fs);
application["allusers"] = convert.toint32(sr.readline());
sr.close();
fs.close();
}
void application_end(object sender, eventargs e)
{
//在应用程序关闭时运行的代码}
void application_error(object sender, eventargs e)
{
//在出现未处理的错误时运行的代码}
void session_start(object sender, eventargs e)
{
//在新会话启动时运行的代码
application.lock();
application["count"] = convert.toint32(application["count"]) + 1;
application["allusers"] = convert.toint32(application["allusers"]) + 1;
system.io.filestream fs = new system.io.filestream("count.txt", system.io.filemode.openorcreate, system.io.fileaccess.readwrite);
system.io.streamwriter sw = new system.io.streamwriter(fs);
sw.writeline(application["allusers"]);
sw.close();
fs.close();
application.unlock();
}
void session_end(object sender, eventargs e)
{
//在会话结束时运行的代码。
// 注意: 只有在 web.config 文件中的sessionstate 模式设置为inproc时,才会引发 session_end 事件。如果会话模式设置为 stateserver 或 sqlserver,则不会引发该事件。
application.lock();
application["count"] = convert.toint32(application["count"]) - 1;
application.unlock();
}
页面只要读出application的内容就行啦:
response.write(application["count"]+"当前人数"+"
总人数:"+application["allusers"]);