使用asp.net Web表单中的流返回可下载文件 [英] Returning a downloadable file using a stream in asp.net web forms

问题描述

在asp.net MVC中，我可以执行以下操作来打开流:

In asp.net MVC I can do something like the following which will open a stream:

 Stream strm1 = GenerateReport(Id);

return File(strm1, 
            "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet",
            "Report_" + reportId.ToString() + ".xlsx");

请注意我如何传递作为流的strm1.然后可以将其命名为Report_ + ... xlsx，如上面的示例所示.

Notice how I am passing strm1 which is a stream. I can then name it Report_+ ...xlsx like the example above shows.

是否有使用c#使用asp.net Web表单执行此操作的类似方法.

Is there a similar way to do this with asp.net web forms using c#.

推荐答案

您可以使用 WriteFile (如果该文件位于您的网站文件夹中).

You can use TransmitFile or WriteFile if the file is in your website folder.

string fileName = string.Format("Report_{0}.xlsx", reportId);
Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("Content-Disposition", 
   string.Format("attachment; filename={0}", fileName));
Response.TransmitFile(fileName);
Response.End();

流

如果您的数据已经在内存中，则需要此方法以大块形式写入响应.

Stream

If your data is already in Memory, you want this method which writes the response in chunks.

Stream stm1 = GenerateReport(Id);
Int16 bufferSize = 1024;
byte[] buffer = new byte[bufferSize + 1];

Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
Response.AddHeader("Content-Disposition", 
    string.Format("attachment; filename=\"Report_{0}.xlsx\";", reportId));
Response.BufferOutput = false;
int count = stm1.Read(buffer, 0, bufferSize);

while (count > 0)
{
    Response.OutputStream.Write(buffer, 0, count);
    count = stm1.Read(buffer, 0, bufferSize);
}

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