WinForm更新文件

参考网上一位朋友代码，略有修改 

private System.Threading.Thread thread1;

        public Login()
        {
            InitializeComponent();

        }

        private void button2_Click(object sender, EventArgs e)
        {
            thread1 = new System.Threading.Thread(new System.Threading.ThreadStart(UploadVserion));
            thread1.Start();
        }


        private void UploadVserion()
        {
            CheckForIllegalCrossThreadCalls = false;

            String url = "http://123.4.5.5/WebApplication/";
            String[] arr_file = { "1.exe", "1.dll", "1.png", "1.rar", "2.mp3" };

            try
            {

                foreach (String filename in arr_file)
                {
                    //DownloadFile("http://localhost:1928/WebServer/downloader/123.rar", @"C:123.rar", progressBar1, label1);

                    String fullpath = url + filename;
                    String savepath = Application.StartupPath +"\" + filename;
                    this.label3.Text = "更新文件：" + filename;
                    DownloadFile(fullpath, savepath, this.progressBar1, label4);
                }
                
                this.label3.Text = "更新成功";

            }
            catch (System.Exception ex)
            {
                this.label3.Text = ex.Message ;
            }
        }

        /// <summary>        
        /// c#,.net 下载文件        
        /// </summary>        
        /// <param name="URL">下载文件地址</param>       
        /// <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>        
        /// 
        private void DownloadFile(string URL, string filename, System.Windows.Forms.ProgressBar prog, System.Windows.Forms.Label label1)
        {
            decimal 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 = Math.Round((decimal)totalDownloadedByte / (decimal)totalBytes * 100, 2);
                    label4.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 ex)
            {
                String a = ex.Message;
                throw;
            }
        }

        private void button3_Click(object sender, EventArgs e)
        {
            DialogResult result = MessageBox.Show("确认取消更新?", "提示···", MessageBoxButtons.OKCancel, MessageBoxIcon.Warning);
            if (result == DialogResult.OK)
            {
                //thread1.Interrupt();

                //this.label4.Text = "1";
                thread1.Abort();
                thread1.Join();
                
            }
        }