C# Winform下载文件并显示进度条

 private void btnDown_Click(object sender, EventArgs e)    

     {           

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

      }    

     /// <summary>          

      /// c#,.net 下载文件      

          /// </summary>       

        /// <param name="URL">下载文件地址</param>    

           ///    

     /// <param name="Filename">下载后的存放地址</param>         

       /// <param name="Prog">用于显示的进度条</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 = "当前补丁下载进度" + percent.ToString() + "%";     

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

//必须加注这句代码,否则label1将因为循环执行太快而来不及显示信息      

           }

                so.Close();      

           st.Close();       

      }           

  catch (System.Exception)           

  {             

    throw;

            }     

    }

posted on 2015-10-23 17:31  zrSoldier  阅读(886)  评论(0编辑  收藏