C#下载文件显示下载进度及速度

C#下载文件 显示下载进度及速度 /// 开启界面刷新计时器 （不使用线程，防止阻塞造成界面刷新不及时） timer1.Enabled = true; try { WebRequest httpRequest = WebRequest.Create(tbFile.Text.Trim()); httpResponse = httpRequest.GetResponse(); pbDown.Maximum = (int)httpResponse.ContentLength; } catch (Exception _ex) { MessageBox.Show(_ex.Message); lbInfo.Text = "点击按钮开始下载"; btnDownload.Enabled = true; return; } timeStart = DateTime.Now; /// 开启文件本地保存流 fileStream = new FileStream(tbFile.Text.Split('/').Last<string>(), FileMode.OpenOrCreate, FileAccess.Write); /// 开启下载进程 downloadThread = new Thread(new ThreadStart(downloadFile)); downloadThread.IsBackground = true; downloadThread.Start();