我正在尝试动态创建 ajax 选项卡并将其 ID 存储在会话中。我收到错误消息“指定的参数超出了有效值的范围。参数名称：值”。我可以通过调用单击按钮事件来创建第一个选项卡。当我单击按钮并在第二次尝试时调用相同的事件时......我得到了错误。似乎我正在引用会话中不再定义或包含的选项卡 ID 或容器\选项卡？
我对此进行了彻底的研究，似乎无法找到答案。任何帮助将不胜感激。
我的 asp 页面上有正确的脚本管理器和程序集引用。这是asp代码和代码片段背后的代码。
<div>
<asp:Button ID ="AddTab" Text="Add Tab" OnClick = "addTab_Click" runat="server"/>
<AjaxToolkit:TabContainer ID="TabContainerContent" runat="server" Height="150px" BackColor="White" AutoPostBack="True"
OnActiveTabChanged="TabContainerContent_OnActiveTabChanged" >
</AjaxToolkit:TabContainer>
<asp:Label ID="currentTabIndex" runat="server"></asp:Label>
</div>
</td>
代码背后
private List<string> dynamicTabIDs;
protected void Page_Init(Object sender, EventArgs e)
{
if (Session["dynamicTabIDs"] != null)
{
dynamicTabIDs = (List<string>)Session["dynamicTabIDs"];
foreach (string tabID in dynamicTabIDs)
{
AjaxControlToolkit.TabPanel tab = new AjaxControlToolkit.TabPanel();
tab.ID = tabID;
tab.HeaderText = "Tab " + (TabContainerContent.Tabs.Count + 1).ToString();
Label tabContent = new Label();
tabContent.ID = "lbl_tab_" + TabContainerContent.Tabs.Count.ToString();
tabContent.Text = "Tab " + (TabContainerContent.Tabs.Count + 1).ToString();
tab.Controls.Add(tabContent);
TabContainerContent.Tabs.Add(tab);
}
}//end if
else
{
dynamicTabIDs = new List<string>();
}
}
protected void Page_PreRender(object sender, EventArgs e)
{
Session["dynamicTabIDs"] = dynamicTabIDs;
}
protected void TabContainerContent_OnActiveTabChanged(object sender, EventArgs e)
{
currentTabIndex.Text = TabContainerContent.ActiveTab.ID;
}
public void addTab_Click(object sender, EventArgs e)
{
AjaxControlToolkit.TabPanel tab = new AjaxControlToolkit.TabPanel();
tab.ID = "tab" + Convert.ToString(TabContainerContent.Tabs.Count);
tab.HeaderText = "Tab " + (TabContainerContent.Tabs.Count + 1).ToString();
Label tabContent = new Label();
tabContent.ID = "lbl_tab_" + TabContainerContent.Tabs.Count.ToString();
tabContent.Text = "Tab " + (TabContainerContent.Tabs.Count + 1).ToString();
tab.Controls.Add(tabContent);
TabContainerContent.Tabs.Add(tab);
TabContainerContent.ActiveTab = tab;
dynamicTabIDs.Add(tab.ID);
}