private void menu_Portrait_Click(object sender, EventArgs e) { if (Tool.CheckLogin("请登陆后更新您的头像", "温馨提示") == false) { return; } PhotoChooserTask task = new PhotoChooserTask { PixelHeight = 256, PixelWidth = 256, ShowCamera = true, }; task.Completed += (s, e1) => { if (e1.ChosenPhoto != null) { BitmapImage bmpSource = new BitmapImage( ); bmpSource.SetSource(e1.ChosenPhoto); BitmapImage g_bmp = new BitmapImage( ); g_bmp.CreateOptions = BitmapCreateOptions.DelayCreation; g_bmp.SetSource(e1.ChosenPhoto); Stream g_stream = Tool.ReduceSize(g_bmp); //开始后台传输图片 Dictionary <string, object> parameters = new Dictionary <string, object> { { "uid", Config.UID }, }; Tool.AsyncUserUpdatePortrait(g_stream, parameters); //退回 EventSingleton.Instance.ToastMessage(null, "后台正在发送图片更新头像"); } }; try { task.Show( ); } catch (Exception ex) { System.Diagnostics.Debug.WriteLine(ex.Message); } }