尝试从ASP.NET服务器下载文件，并使用UpdatePanel，ProgressTemplate ..但不工作-英雄云拓展知识分享

我想在程序中采取一些行动。虽然这些动作运行，但我想告知客户这些动作正在进行中。在此进程结束后，我想将此文件发送到客户端，例如excel文件。我最大程度地减少了我的项目，以确切显示问题在哪里

现在，这是我的问题：Button1不起作用，而Button2正常工作为何？和如何解决？或许有更好的解决方案？

这是我的ASPX Clint代码：

<form id="form1" runat="server">
<asp:ScriptManager ID="ScriptManager1" runat="server"> </asp:ScriptManager>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:Button ID="Button1" runat="server" Height="38px" onclick="Button1_Click" Text="Button" Width="167px" />
</ContentTemplate>
</asp:UpdatePanel>
<asp:UpdateProgress ID="UpdateProgress1" runat="server">
<ProgressTemplate>
The report is creating please wait...
</ProgressTemplate>
</asp:UpdateProgress>
<asp:Button ID="Button2" runat="server" OnClick="Button2_Click" Text="Button" />
</form>

接下来是我的代码

public partial class WebForm1 : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{}
protected void Button1_Click(object sender, EventArgs e)
{
Thread.Sleep(5000);
sendBackToUser();
}
protected void Button2_Click(object sender, EventArgs e)
{
sendBackToUser();
}
private void sendBackToUser()
{
FileInfo file = new FileInfo(@"C:\F\f.xlsx");
if (file.Exists)
{
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment; filename=" + @"C:\F\f.xlsx");
Response.AddHeader("Content-Type", "application/Excel");
Response.ContentType = "application/vnd.xlsx";
Response.AddHeader("Content-Length", file.Length.ToString());
Response.WriteFile(file.FullName);
Response.End();
}
else
{
Response.Write("This file does not exist.");
}
}
}