从 UpdatePanel 内的 GridView 中的 link 下载文件失败

Question

我正在尝试通过 asp.net 中的 FileUpload 控件（即 file.Docx 等).然后我希望在 GridView 中将文件名显示为 link，这样当用户单击它时，文件就会被下载。

我什么都试过了。在调试中它什么也没显示。它到达 Response.End 的末尾，但未下载任何内容。

网格视图：

<asp:TemplateField>
     <ItemTemplate>
        <asp:LinkButton ID="btnLinkDownloadTender" runat="server" Text='<%#  Eval("UploadedTenderPath") %>'CommandArgument='<%# Eval("UploadedTenderPath") %>' OnClick="DownloadTender"></asp:LinkButton>
     </ItemTemplate>
 </asp:TemplateField>

上传：

protected void UploadTender()
{
    try
    {
        if (FileUpload1.HasFile)
        {
            string fileName = Path.GetFileName(FileUpload1.FileName);
            FileUpload1.PostedFile.SaveAs(Server.MapPath("~/UploadedTenders/") + fileName);

            HdnFieldUploadedTender.Value = fileName;

            ResultLabel.ResultLabelAttributes("Tender Uploaded", ProjectUserControls.Enums.ResultLabel_Color.Red);
            ResultPanel.Controls.Add(ResultLabel);
        }
        else
        {
            ResultLabel.ResultLabelAttributes("No file specified", ProjectUserControls.Enums.ResultLabel_Color.Red);
            ResultPanel.Controls.Add(ResultLabel);
        }
    } 
}

下载：

protected void DownloadTender(object sender, EventArgs e)
{
    string filePath = (sender as LinkButton).CommandArgument;

    Response.ContentType = ContentType;
    Response.AppendHeader("Content-Disposition", "attachment; filename=" + Path.GetFileName(filePath) );
    Response.Write(filePath);
    Response.End();
}

文件夹结构：

Answer 1

将AppendHeader替换为AddHeader

string fullFilePath = Server.MapPath("~/UploadedTenders/") + filePath;
Response.Clear();
Response.ClearHeaders();
Response.ClearContent();
Response.AddHeader("Content-Disposition", "attachment; filename=" + fullFilePath );
Response.ContentType = ContentType;
Response.TransmitFile(fullFilePath);

Answer 2

尝试以下操作，还请向我们提供有关您网页的更多信息。另外，如果您使用的是 chrome，请检查 chrome 是否阻止了它

var fileInfo = new FileInfo(filePath);
Response.Clear();
Response.Buffer = true;
Response.AddHeader("Content-Disposition", "attachment; filename=" + fileInfo.Name);
Response.AddHeader("Content-Length", fileInfo.Length.ToString(CultureInfo.InvariantCulture));
Response.ContentType = "application/octet-stream";
Response.BinaryWrite(File.ReadAllBytes(fileInfo.FullName));
Response.Flush();
Response.End();

编辑：在您的 gridview Row Databound 添加以下内容

LinkButton lb = e.Row.FindControl("btnLinkDownloadTender") as LinkButton;
if (lb != null)
     ScriptManager.GetCurrent(this).RegisterPostBackControl(lb);

以上代码将注册 LinkButton 以引起完整回发，这将允许下载成功，在更新面板中上传文件时同样适用

Answer 3

试试这个：

Response.ContentType = "application/octet-stream";
Response.AddHeader("content-disposition", "attachment; filename=" + file_name);
Response.WriteFile(filePath);
Response.Flush();
Response.End();

从 UpdatePanel 内的 GridView 中的 link 下载文件失败

Downloading a file from a link in a GridView inside an UpdatePanel fails

c#

asp.net

gridview

webforms

file-upload