GridView 中下载文件

GridView 中每一行都有一个File Name 列,显示文件名称,点击后可下载.

前台GridView :

<asp:TemplateField HeaderText="File Name" SortExpression="FULLFILENAME">
                  <itemtemplate>
                    <asp:LinkButton id="lbnFileName" onclick="lbnFileName_Click" runat="server" Text='<%# Eval("FULLFILENAME") %>'></asp:LinkButton>
                    <asp:Label id="lblGUIDFILENAME" runat="server" Text='<%# Eval("GUID_FILENAME") %>' Visible="False"></asp:Label>
                    <asp:Label id="lblTYPENAME" runat="server" Text='<%# Eval("TYPENAME") %>' Visible="False"></asp:Label>
                  </itemtemplate>
</asp:TemplateField> 

后台cs:

 

protected void lbnFileName_Click(object sender, EventArgs e)
    {
        try
        {
            GridViewRow objGridViewRow = (GridViewRow)((LinkButton)sender).NamingContainer;

            string strDQAManualFolder = Server.MapPath(@"~\DOC\Manual");
            string strFileName = ((LinkButton)objGridViewRow.FindControl("lbnFileName")).Text;
            string strGuid = ((Label)objGridViewRow.FindControl("lblGUIDFILENAME")).Text;
            string strFileType = ((Label)objGridViewRow.FindControl("lblTYPENAME")).Text;

            String fileName = HttpUtility.UrlEncode(strFileName);
            FileInfo file = new FileInfo(strDQAManualFolder + "\\" + strGuid + '.' + strFileType);
            if (file.Exists == false)
            {
                this.ClientScript.RegisterStartupScript(this.GetType(), "FileNotFound", "alert('System can not find the file!');", true);
                return;
            }
            switch (strFileType)
            {
                case "doc":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/octet-stream";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "ppt":
                case "pps":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/vnd.ms-powerpoint";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "xls":
                case "csv":
                case "xml":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/vnd.ms-excel";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "pdf":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/pdf";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "htm":
                case "html":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "text/html";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "gif":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "image/gif";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "jpg":
                case "jpeg":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "image/jpeg";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "rtf":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/rtf";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                case "asp":
                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);
                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "text/asp";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;

                default:

                    Response.Clear();
                    //Response.HeaderEncoding = System.Text.;
                    //欲讓使用者看到的檔案名稱
                    Response.AddHeader("Content-Disposition", "filename=" + fileName);

                    //檔案大小
                    Response.AddHeader("Content-Length", file.Length.ToString());
                    //檔案類型
                    Response.ContentType = "application/octet-stream";
                    //顯示檔案下載視窗
                    Response.TransmitFile(file.FullName);
                    Response.End();
                    break;
            }

        }
        catch (Exception ex)
        {
            this.ShowMessage("Download function exception!");
            Response.Write(ex.ToString());
        }

    }