我无法在标签中显示值

Question

此函数中的“id”字符串具有值，但不会显示在标签中。我有一个突破点，我可以清楚地看到这样的价值。

protected void RadTreeList1_ItemCommand(object sender, TreeListCommandEventArgs e)
{
    string id = "";
    if (e.CommandName == "Select")
    {
        if (e.Item is TreeListDataItem)
        {
            TreeListDataItem item = e.Item as TreeListDataItem;
           id = item.GetDataKeyValue("MessageID").ToString();
        }
    }
    Label2.Text = id;
}

更新 并且也不起作用：

....
string id = item.GetDataKeyValue("MessageID").ToString();
Label2.Text = id;

有关可能原因的任何建议吗？

Answer 1

// try this Put  Label2.Text = id; in   if (e.Item is TreeListDataItem)

protected void RadTreeList1_ItemCommand(object sender, TreeListCommandEventArgs e)
{
    string id = "";
    if (e.CommandName == "Select")
    {
        if (e.Item is TreeListDataItem)
        {
            TreeListDataItem item = e.Item as TreeListDataItem;
             id = Convert.ToString(item.GetDataKeyValue("MessageID")) ;
            Label2.Text = id;
        }
    }

}