ASP.NET 上传、下载

 /// <summary>
    /// 上传文件
    /// </summary>
    /// <param name="path"></param>
    /// <returns></returns>
    protected bool Uploadfile(string path)
    {

        bool flag = false;

        if (FileUpload1.HasFile)
        {
            string fileName = FileUpload1.FileName;
            if (!CfileName(path, fileName))
            {
                path += fileName;
                FileUpload1.SaveAs(path);
                Response.Write("<script>alert('上传成功')</script>");
                flag = true;
            }
            else
            {
                Response.Write("<script>alert('上传失败')</script>");
                flag = false;
            }
        }
        else
        {
            Response.Write("<script>alert('上传失败')</script>");
            flag = false;
        }
        return flag;
    }

    /// <summary>
    /// 文件名比较
    /// </summary>
    /// <param name="path"></param>
    /// <param name="fileNames"></param>
    /// <returns></returns>
    private bool CfileName(string path, string fileNames)
    {
        bool flag = false;
        //获取文件夹下所有的文件名
        string[] filename = Directory.GetFiles(path);
        for (int i = 0; i < filename.Length; i++)
        {
            if (fileNames.ToString() == System.IO.Path.GetFileName(filename[i].ToString()).ToString())
            {
                Response.Write("<script>alert('文件名已存在,请换文件名在上传,谢谢!')</script>");
                flag = true;
                break;
            }
            else
            {
                flag = false;
            }
        }
        return flag;

    }

    /// <summary>
    /// 上传文件资料写入文件
    /// </summary>
    /// <param name="path"></param>
    /// <param name="big"></param>
    /// <param name="dt"></param>
    /// <param name="ip"></param>
    /// <returns></returns>
    private bool WriteFiles(string path, int big, DateTime dt, string ip)
    {
        string path1 = Request.PhysicalApplicationPath;
        string paths = path1+"\\upfile";

        paths = paths + "text.txt";
        if (!File.Exists(paths))
        {

            FileStream fs1 = new FileStream(paths, FileMode.Create, FileAccess.Write);//创建写入文件 
            StreamWriter sw = new StreamWriter(fs1);
            sw.Write("              文件名");//开始写入值
            sw.Write("                                 大小");
            sw.Write("                                 时间");
            sw.Write("                                 上传IP");
            sw.Close();
            fs1.Close();


        }
        else
        {
            FileStream fs = new FileStream(paths, FileMode.Append, FileAccess.Write);
            StreamWriter sr = new StreamWriter(fs);
            sr.WriteLine("");
            sr.Write("                文件名:" + path);//开始写入值
            sr.Write("                                   大小:" + big + "KB");
            sr.Write("                                   时间:" + dt);
            sr.Write("                                   IP:" + ip);
            sr.Close();
            fs.Close();

        }
        return true;
    }


    protected void bnt_Upload_Click(object sender, EventArgs e)
    {
        string path = Request.PhysicalApplicationPath;
        path += @"\upfile\";
        if (Uploadfile(path))
        {
            string fname = FileUpload1.FileName;
            int big = this.FileUpload1.PostedFile.ContentLength;
            string ip = HttpContext.Current.Request.ServerVariables["REMOTE_ADDR"];
            DateTime dt = DateTime.Now;

            WriteFiles(fname, big, dt, ip);
        }
    }

 

 下载

  string path1 = Request.PhysicalApplicationPath;
        string path=path1+"\\upfile";
        DirectoryInfo dir = new DirectoryInfo(path);
        FileInfo[] finfo = dir.GetFiles();
        int cell = finfo.Length;
        int rows = 3;
        
        for (int i = 0; i < cell; i++)
        {
            TableRow tblrow = new TableRow();
            for (int j = 0; j < rows; j++)
            {
                TableCell tblcell = new TableCell();
                switch (j)
                {
                    case 0:
                        tblcell.Text = i.ToString();
                        break;
                    case 1:
                        tblcell.Text = "<a href= upfile/" + finfo[i].ToString() + ">" + "下载" + "</a>";
                        break;
                    default:
                        tblcell.Text =  finfo[i].ToString() ;
                        break;
                }
                tblrow.Cells.Add(tblcell);
                

            }
                
            Table1.Rows.Add(tblrow);