C# Winform下載文件並顯示進度條

 private void btnDown_Click(object sender, EventArgs e)    c#

     {           .net

  DownloadFile("http://localhost:1928/WebServer/downloader/123.rar", @"C:\123.rar", progressBar1, label1);   orm

      }    string

     /// <summary>          it

      /// c#,.net 下載文件      io

          /// </summary>       object

        /// <param name="URL">下載文件地址</param>    file

           ///    循環

     /// <param name="Filename">下載後的存放地址</param>         下載

       /// <param name="Prog">用於顯示的進度條</param>       

        ///       

  public void DownloadFile(string URL, string filename, System.Windows.Forms.ProgressBar prog, System.Windows.Forms.Label label1)     

    {        

     float percent = 0;       

      try          

   {         

        System.Net.HttpWebRequest Myrq = (System.Net.HttpWebRequest)System.Net.HttpWebRequest.Create(URL);   

              System.Net.HttpWebResponse myrp = (System.Net.HttpWebResponse)Myrq.GetResponse();   

              long totalBytes = myrp.ContentLength;        

         if (prog != null)            

     {          

           prog.Maximum = (int)totalBytes;      

           }       

          System.IO.Stream st = myrp.GetResponseStream();          

       System.IO.Stream so = new System.IO.FileStream(filename, System.IO.FileMode.Create);  

               long totalDownloadedByte = 0;      

           byte[] by = new byte[1024];          

       int osize = st.Read(by, 0, (int)by.Length);          

       while (osize > 0)       

          {                   

  totalDownloadedByte = osize + totalDownloadedByte;         

            System.Windows.Forms.Application.DoEvents();       

              so.Write(by, 0, osize);          

           if (prog != null)          

           {                

         prog.Value = (int)totalDownloadedByte;   

                  }          

           osize = st.Read(by, 0, (int)by.Length);

                    percent = (float)totalDownloadedByte / (float)totalBytes * 100;         

            label1.Text = "當前補丁下載進度" + percent.ToString() + "%";     

                System.Windows.Forms.Application.DoEvents();

//必須加註這句代碼,不然label1將由於循環執行太快而來不及顯示信息      

           }

                so.Close();      

           st.Close();       

      }           

  catch (System.Exception)           

  {             

    throw;

            }     

    }

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