如何使用弹出窗口询问保存文件的位置，在 C# 中下载文件

Question

 WebClient webClient = new WebClient();
 webClient.DownloadFile(pdfFilePath, @"D:\DownloadPastPapers.pdf");

我正在下载直接下载到指定路径的pdf文件，但我想打开一个弹出窗口询问保存位置（如所有正常网站在下载时显示的那样）它是一个 webfroms asp.net 应用程序

Answer 1

您可以先弹出一个SaveFileDialog询问保存路径。

然后在您的 DownloadFile()

中使用此路径

SaveFileDialog saveFileDialog1 = new SaveFileDialog(); 
saveFileDialog1.InitialDirectory =     Convert.ToString(Environment.SpecialFolder.MyDocuments); 
saveFileDialog1.Filter = "Your extension here (*.EXT)|*.ext|All Files (*.*)|*.*" ; 
saveFileDialog1.FilterIndex = 1; 

if(saveFileDialog1.ShowDialog() == DialogResult.OK) 
{ 
    Console.WriteLine(saveFileDialog1.FileName);//Do what you want here

    WebClient webClient = new WebClient();
   webClient.DownloadFile(pdfFilePath, saveFileDialog1.FileName");
}

Answer 2

private string SelectDestinationFile()
{
   var dialog = new SaveFileDialog()
   {
       Title = "Select output file"
       //--Filter can also be defined here
   };

   return dialog.ShowDialog() == true ? dialog.FileName : null;
}

稍后

private void DownloadFile(string url)
{
    var filePath = SelectDestinationFile();

    if(string.IsNullOrWhiteSpace(filePath))
       throw new InvalidOperationException("invalid file path");

    using (var client = new WebClient())
       client.DownloadFile(url, filePath);
}

希望对你有所帮助

P.S. 这适用于 WPF 应用程序。

Answer 3

    pdfFilePath = pdfFilePath + "/DownloadPastPapers.pdf";
    Response.Clear();
    Response.ContentType = "application/pdf";
    Response.AppendHeader("Content-Disposition", "attachment; filename=foo.pdf");
    Response.TransmitFile(pdfFilePath);
    Response.End();

如何使用弹出窗口询问保存文件的位置，在 C# 中下载文件

How to download a file in c# with a popup asking where to save file

c#

asp.net

webforms