FileUpload

Question

FileUpload控件有客户端下载功能么？

Answer 1

。。  下载点击连接路径就能下载。 路径放在<a>FileUpload是上传的控件

Answer 2

========文件上传===============================================
protected void Button1_Click(object sender, EventArgs e)
    {
        Boolean fileOk = false;
//获取文件物理路径
        string path = Server.MapPath("~/Account/");
//判断是否选择文件
        if (FileUpload1.HasFile)
        {
    //取得文件扩展名 
            string exName = System.IO.Path.GetExtension(FileUpload1.FileName).ToLower();
    //限定文件类型
            string[] allowExtn = { ".jpg", ".txt", ".gif" };
            //对上传的文件的类型进行一个个匹对
            for (int i = 0; i < allowExtn.Length; i++)
            {
                if (exName == allowExtn[i])
                {
                    fileOk = true;
                    break;
                }
            }

            ////对上传文件的大小进行检测，限定文件最大不超过1M
            //if (FileUpload1.PostedFile.ContentLength > 1024000)
            //{
            //    fileOk = false;
            //}            if (!fileOk)
            {
                Response.Write("<script>alert('文件类型不对');</script>");
            }
            else
            {
                try
                {
                    FileUpload1.PostedFile.SaveAs(path + FileUpload1.FileName);
                    Response.Write("<script>alert('上传成功');</script>");
                }
                catch
                {                    Response.Write("<script>alert('上传失败');</script>");
                }
            }        }

Answer 3

看英文应该能猜到啊。。file...upload...又不是file..download

Answer 4

#region 文件下载
       public bool DownLoadFile(string localPath, string hostURL, int byteCount, string userID, long cruuent)
       {
           
           bool result = true;
           
           
           string tmpURL = hostURL;
          
           byteCount = byteCount * 1024;
           hostURL = tmpURL + "&npos=" + cruuent.ToString();
           
           System.IO.FileStream fs;  
           fs = new FileStream(localPath, FileMode.OpenOrCreate);
           if (cruuent > 0)
           {
               //偏移指针
               fs.Seek(cruuent, System.IO.SeekOrigin.Current); 
           }
           System.Net.HttpWebRequest request = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(hostURL);
           if (cruuent > 0)
           {
               request.AddRange(Convert.ToInt32(cruuent));    //设置Range值
           }           try
           {
               //向服务器请求，获得服务器回应数据流
               System.IO.Stream ns = request.GetResponse().GetResponseStream();               byte[] nbytes = new byte[byteCount];
               int nReadSize = 0;
               nReadSize = ns.Read(nbytes, 0, byteCount);
              
               while (nReadSize > 0)
               {
                   fs.Write(nbytes, 0, nReadSize);
                   nReadSize = ns.Read(nbytes, 0, byteCount);
                  
               }
               fs.Close();
               ns.Close();
           }
           catch(Exception ex)
           {
               LOG.Error("下载" + localPath + "的时候失败！" + "原因是:" + ex.Message);
               fs.Close();
               result = false;
           }
           return result;     
       }
       #endregion