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Asp.net利用Application与Session统计网站在线人数和访问总人数
protected void Application_Start(Object sender, EventArgs e)
{
SqlConnection con=new SqlConnection("server=localhost;database=countPeople;uid=sa;pwd=sa;");
con.Open();
SqlCommand cmd=new SqlCommand("select * from countPeople",con);
int count=Convert.ToInt32(cmd.ExecuteScalar());
con.Close();
Application["totol"]=count;
Application["online"]=0;
}
protected void Session_Start(Object sender, EventArgs e)
{
Session.Timeout=1;
Application.Lock();
Application["totol"]=(int)Application["totol"]+1;
Application["online"]=(int)Application["online"]+1;
Application.UnLock();
}
protected void Session_End(Object sender, EventArgs e)
{
Application.Lock();
Application["online"]=(int)Application["online"]-1;
Application.UnLock();
}
protected void Application_End(Object sender, EventArgs e)
{
SqlConnection con=new SqlConnection("server=localhost;database=countPeople;uid=sa;pwd=sa;");
con.Open();
SqlCommand cmd=new SqlCommand("update countPeople set num=" + Application["totol"].ToString(),con);
cmd.ExecuteNonQuery();
con.Close();
}
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Application.Lock();
锁定Application对象, 别的进程必须等UNLOCK后才能更新Application内容.防止两个进程同时修改APPLICATION内容.
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