使用ASP.NET下载图片/Word文档
如果我将以下代码：
Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=capitol.jpg")
Response.WriteFile(MapPath("capitol.jpg"))
放入Page_Load中，我将出现下载图像的对话框。但是当我将相同的代码放入子例程中时：
Private Sub downloadPic()
MsgBox("Hello!")
Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=capitol.jpg")
Response.WriteFile(Server.MapPath("capitol.jpg"))
Response.End()
End Sub
我得到了 MsgBox（仅用于测试），但我无法下载图像。有什么想法吗？
If I put the following code:
Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=capitol.jpg")
Response.WriteFile(MapPath("capitol.jpg"))
into Page_Load, I will get the dialog box to download the image. But when I put the same code into a sub routine:
Private Sub downloadPic()
MsgBox("Hello!")
Response.ContentType = "image/jpeg"
Response.AppendHeader("Content-Disposition", "attachment; filename=capitol.jpg")
Response.WriteFile(Server.MapPath("capitol.jpg"))
Response.End()
End Sub
I get the MsgBox (just for testing) but I don't get the ability to download the image. Any ideas?
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评论（2）
您无法输出到页面并在单个请求/响应中推送下载内容。
无论如何，在分配标头和
WriteFile之前，您的代码将无法与Response.Clear()正常工作。You can't output to the page and also push the download content within a single request/response.
Anyway your code won't work properly with a
Response.Clear()before assigning header andWriteFile.谢谢您的评论。我的代码的问题是我在 UpdatePanel 中有 WriteFile 代码。那是我的错误！
Thank you for the comment. The problem with my code was that I had the WriteFile code within an UpdatePanel. That was my mistake!