JavaScript中未更新ASP.Net会话

Question

当单击我的按钮时，我启动了javascript以获取会话。但是会话的值未更新...

alert('<%= Session["file"]%>');

Answer 1

It won't be up to date if its changed after the page is rendered.

You might want to look at page methods (an ajax system) or another ajax approach.

Answer 2

Any inline code once rendered to the page will not change, which is a normal behavior. use a Hidden field instead.

mark-up:

<asp:HiddenField ID="HiddenField1" runat="server" />
<asp:Button ID="Button1" runat="server" Text="Button" onclick="Button1_Click" />

code-behind:

protected void Button1_Click(object sender, EventArgs e)
{
    Session["file"] = "Data Here";
    HiddenField1.Value = Session["file"].ToString();
}

javascript:

alert(document.getElementById('<%= HiddenField1.ClientID %>').value);