使用 Response.Write 生成供下载的文件并更改页面上的元素

发布于 2024-09-15 15:53:21 字数 236 浏览 5 评论 0原文

我正在尝试更改 asp:textbox 的文本并折叠页面上某些 ascx 控件中的某些 ajaxToolkit:CollapsiblePanelExtenders 以及输出动态生成的文件。我可以毫无问题地折叠 CollapsiblePanelExtenders 并从代码隐藏中更改文本框的文本或输出文件。当我希望这两个事件在同一个回发中发生时，问题就出现了。不幸的是，使用 Response.Write 会取消对页面的所有其他更改。

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惯饮孤独 2024-09-22 15:53:21

下面是一个快速概念示例，说明如何使用 UpdatePanel 通过 AJAX 回发来更新屏幕上的文本并同时下载文件。

ASPX 代码：

<asp:UpdatePanel id="update1" runat="server">
  <ContentTemplate>
    <asp:TextBox id="textbox1" runat="server" /><br />
    <asp:Button id="button1" onclick="button1_Click" runat="server" />
  </ContentTemplate>
</asp:UpdatePanel>

C# 代码：

private string GenerateDownloadLink(string fileContent, string fileName) {
  // worker process will need write access to this folder
  string downloadFolder = "./download";

  TextWriter file = new StreamWriter(Server.MapPath(downloadFolder) + @"\" + fileName);
  file.WriteLine(fileContent);
  file.Close();

  return downloadFolder + "/" + fileName;
}

private void button1_Click(object sender, EventArgs e) {
  textbox1.Text = "the file download will begin shortly...";

  string fileContent = "here is the content for a new dynamically generated file";

  string fileUrl = GenerateDownloadLink(fileContent, "hello.txt");

  ScriptManager.RegisterStartupScript(this, this.GetType(), "StartDownload", "window.location = '" + fileUrl + "';", true);
}

另请查看此 MSDN 示例。

我还想补充一点，UpdatePanels 会吞噬你的灵魂，你应该摆脱它们，转而使用诸如通过 AJAX 调用 WebMethod 之类的方法（如果可能的话）:)

Here is a quick concept example of how you could update text on the screen and download a file at the same time through an AJAX postback with an UpdatePanel.

ASPX code:

<asp:UpdatePanel id="update1" runat="server">
  <ContentTemplate>
    <asp:TextBox id="textbox1" runat="server" /><br />
    <asp:Button id="button1" onclick="button1_Click" runat="server" />
  </ContentTemplate>
</asp:UpdatePanel>

C# code:

private string GenerateDownloadLink(string fileContent, string fileName) {
  // worker process will need write access to this folder
  string downloadFolder = "./download";

  TextWriter file = new StreamWriter(Server.MapPath(downloadFolder) + @"\" + fileName);
  file.WriteLine(fileContent);
  file.Close();

  return downloadFolder + "/" + fileName;
}

private void button1_Click(object sender, EventArgs e) {
  textbox1.Text = "the file download will begin shortly...";

  string fileContent = "here is the content for a new dynamically generated file";

  string fileUrl = GenerateDownloadLink(fileContent, "hello.txt");

  ScriptManager.RegisterStartupScript(this, this.GetType(), "StartDownload", "window.location = '" + fileUrl + "';", true);
}

Also check out this MSDN example.

I would also like to add that UpdatePanels will eat your soul and you should get rid of them in favor of something like calling a WebMethod via AJAX if at all possible :)

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