网络通信

            //DownloadProgressChanged

            //DownloadStringCompleted 

            //OpenReadCompleted

            //OpenWriteCompleted

             //UploadProgressChanged

             //UploadStringCompleted

             //  WriteStreamClosed

 

           // DownLoadStringAsnc

            //OpenReadAsync

            //UpLoadStringAsync

            //OpenWriteAsync

            WebClient client = new WebClient();

            if (client.IsBusy)

                client.CancelAsync();

            client.OpenReadCompleted+=new OpenReadCompletedEventHandler(client_OpenReadCompleted);

            client.DownloadProgressChanged += new DownloadProgressChangedEventHandler(client_DownloadProgressChanged);

            client.OpenReadAsync(new Uri("path"));

 

        }

        private void client_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)

        {

            BitmapImage bitmap = new BitmapImage();

            bitmap.SetSource(e.Result);

            Image1.Source = bitmap;

         

        }

        private void client_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)

        {

            int percent = e.ProgressPercentage;

            long recieve = e.BytesReceived;

            long total = e.TotalBytesToReceive;

 

        }