Application的问题

[chengbo1983]

Statistic.ascx中

<%@ Control Language="C#" Inherits="Click.Statistic" Src="Statistic.ascx.cs"%>
<%@ OutputCache Duration="300" VaryByParam="None" %>
当前在线:<asp:Label ID="lblOnlineNow" runat="server" EnableViewState="false"/>人

Statistic.ascx.cs中

using System;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;

namespace Click
{
public class Statistic : UserControl
{
protected Label lblOnlineNow;
void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
lblOnlineNow.Text = (string)Application["online"];
}
}
}
}

Global.asax中
<script language="VB" runat="server">
Sub Session_Start(ByVal sender As Object, ByVal e As EventArgs)
' 在会话启动时激发
Session.Timeout=10
Application("online") = Application("online") + 1
End Sub

Sub Session_End(ByVal sender As Object, ByVal e As EventArgs)
' 在会话结束时激发
Application("online") = Application("online") - 1
End Sub
</script>

在index.aspx中引入这个UserControl
出错Exception Details: System.InvalidCastException: Specified cast is not valid.
请问怎么解决？

[chengbo1983]

没人回答？顶一下

[chengbo1983]

什么嘛？都嫌麻烦不回答？

[possible_Y]

lblOnlineNow.Text = Application["online"].ToString;

[zj0727]

Application["online"].ToString(); 另外操作Application时要先锁定，操作完后再解锁

[possible_Y]

你怎么可以把int型的强制转化为string的呢？

[chengbo1983]

lblOnlineNow.Text = Application["online"].ToString;
我试了的，不行

请问锁定是Application.Lock()吗？

[chengbo1983]

哦，搞定了，谢谢大家

Application["online"].ToString();

和

(string)Application["online"];
还不一样哦

[mazekui]

是的

[chengbo1983]

请问和ASP里一样吗？

锁定是Application.Lock();

解锁是Application.Unlock();