Question

我正在尝试使用文件上传控件上传然后使用Asp.net C＃下载文件，但是它给了我一个找不到目录的例外。我可以帮助我解决这个问题吗？

这是我的.aspx文件：

<%@ Page Language="C#" AutoEventWireup="true" CodeFile="fileuploadcheck.aspx.cs" Inherits="fileuploadcheck" %>

    <!DOCTYPE html>

    <html xmlns="http://www.w3.org/1999/xhtml">
    <head runat="server">
        <title></title>
    </head>
    <body>
        <form id="form1" runat="server">
        <div>
          <table style="padding: 20px;">
                <tr>
                    <td>
                        <asp:Label ID="lblFilename" runat="server" Text="Browse:"></asp:Label>
                    </td>
                    <td>
                        <asp:FileUpload ID="fileUpload1" runat="server" />
                    </td>
                </tr>
                <tr>
                    <td>
                        &nbsp;
                    </td>
                    <td>
                        &nbsp;
                    </td>
                </tr>
                <tr>
                    <td>
                        <asp:LinkButton ID="OnLnkUpload" runat="server" OnClick="OnLnkUpload_Click" Font-Underline="False">Upload</asp:LinkButton>
                    </td>
                    <td>
                        <asp:LinkButton ID="OnLnkDownload" runat="server" OnClick="OnLnkDownload_Click" Font-Underline="False">Download</asp:LinkButton>
                    </td>
                </tr>
            </table>
        </div>
        </form>
    </body>
    </html>

这是我的代码背后文件：

    using System;
    using System.Configuration;
    using System.Data;
    using System.Linq;
    using System.Web;
    using System.Web.Security;
    using System.Web.UI;
    using System.Web.UI.HtmlControls;
    using System.Web.UI.WebControls;
    using System.Web.UI.WebControls.WebParts;
    using System.Xml.Linq;
    using System.IO;

    public partial class fileuploadcheck : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {

        }
        /// To save/upload files in folder and download files from folder in asp.net
        /// </summary>
        string filename = string.Empty;

        protected void btnUpload_Click(object sender, EventArgs e)
        {

        }

        protected void OnLnkUpload_Click(object sender, EventArgs e)
        {
            filename = Path.GetFileName(fileUpload1.PostedFile.FileName);
            fileUpload1.SaveAs(Server.MapPath("Files/" + filename));

            Response.Write("File uploaded sucessfully.");
            lblFilename.Text = "Files/" + fileUpload1.FileName;
        }

        // To download uplaoded file
        protected void OnLnkDownload_Click(object sender, EventArgs e)
        {
            if (lblFilename.Text != string.Empty)
            {
                if (lblFilename.Text.EndsWith(".txt"))
                {
                    Response.ContentType = "application/txt";
                }
                else if (lblFilename.Text.EndsWith(".pdf"))
                {
                    Response.ContentType = "application/pdf";
                }
                else if (lblFilename.Text.EndsWith(".docx"))
                {
                    Response.ContentType = "application/docx";
                }
                else
                {
                    Response.ContentType = "image/jpg";
                }

                string filePath = lblFilename.Text;

                Response.AddHeader("Content-Disposition", "attachment;filename=\"" + filePath + "\"");
                Response.TransmitFile(Server.MapPath(filePath));
                Response.End();
            }
        }
    }

Answer 1

使用此

 protected void OnLnkUpload_Click(object sender, EventArgs e)
  {
            filename = Path.GetFileName(fileUpload1.PostedFile.FileName);
           fileUpload1.SaveAs(Server.MapPath("~/Files/" + filename));
            Response.Write("File uploaded sucessfully.");
            lblFilename.Text = "Files/" + fileUpload1.FileName;
  }

确保您的驱动器具有读/写权限...

Answer 2

Server.MapPath("Files/" + filename)正在映射虚拟目录＆＃34;文件＆＃34;位于应用程序的执行路径（通常是Web应用程序的已编译DLL所在的＆＃34; bin＆＃34;文件夹）到物理路径。确保以下内容：

你有一个＆＃34;文件＆＃34;您的＆＃34; bin＆＃34;中的虚拟目录夹;如果路径意图在其他地方，例如，在应用程序的根目录之外，请在代码中更改它：Server.MapPath("/Files/" + filename)
确保运行Web服务器（IIS？）的用户对与虚拟目录对应的物理路径具有足够的权限。通常，这是＆＃34; IIS_IUSRS＆＃34;组。该用户需要创建/写入/修改相应物理路径的权限。

Answer 3

你可以试试这个：

fileUpload1.SaveAs(Server.MapPath("~/Files" + filename));

和

   lblFilename.Text = "~/Files" + fileUpload1.FileName;

使用Asp.net上传和下载文件

3 个答案: