ループWinformsのいくつかのコントロールのリフレッシュ

Question

私は天気アプリケーションを作成しようとしています。コンボボックスに新しい都市を入力すると、ラベルやピクチャボックスが更新されません。私はすでにRefresh()Update()とInvalidate()を試していて、どれもうまくいきませんでした。私が言うべきことを私に教えてください。前もって感謝します！

private async void SetWeatherForecastDataToWeatherApp(string city) 
    { 
     try 
     { 
      var jsonData = string.Empty; 
      var url = string.Format("http://api.openweathermap.org/data/2.5/forecast?q={0}&APPID=a54961a05f7a1fc0cf9bd2bf1465dea5", city); 
      var uri = new Uri(url); 
      var request = WebRequest.Create(uri); 
      var response = await request.GetResponseAsync(); 

      using (var stream = response.GetResponseStream()) 
      { 
       using (var streamReader = new StreamReader(stream)) 
       { 
        jsonData = await streamReader.ReadToEndAsync(); 
       } 
      } 
      response.Close(); 

      _jsonFutureWeatherForecastData = jsonData; 

      _weatherForecast = JsonConvert.DeserializeObject<WeatherForecast>(_jsonFutureWeatherForecastData); 
     } 
     catch (Exception ex) 
     { 

      MessageBox.Show(ex.Message, "Input Error", MessageBoxButtons.OK); 
     } 


     var dayNameLabelList = new List<Label>(); 
     var weatherDescriptionLablList = new List<Label>(); 
     var gradesLabel = new List<Label>(); 

     var pictureBoxList = new List<PictureBox>(); 

     int yLocation = 50; 
     int xLocation = Width/2; 
     int cnt = 0; 


     string currDayOfWeek = string.Empty; 
     string CurrentDate = string.Empty; 

     for (int i = 0; i < 9; i++) 
     { 

      currDayOfWeek = _dateConverter.ConvertMilisecondsToCurrentTime(_weatherForecast.WeatherList[i].CurrentDate).DayOfWeek.ToString(); 
      CurrentDate = _dateConverter.ConvertMilisecondsToCurrentTime(_weatherForecast.WeatherList[i].CurrentDate).Day.ToString(); 

      cnt++; 
      pictureBoxList.Add(new PictureBox()); 
      pictureBoxList[i].Name = "WeatherForecastImage" + cnt.ToString(); 
      pictureBoxList[i].Location = new Point(xLocation, yLocation); 
      pictureBoxList[i].Load($"Icons/{_weatherForecast.WeatherList[i].Weather[0].Icon}.png"); 
      Controls.Add(pictureBoxList[i]); 
      pictureBoxList[i].Invalidate(); 

      dayNameLabelList.Add(new Label()); 
      dayNameLabelList[i].Text = currDayOfWeek + " " + CurrentDate; 
      dayNameLabelList[i].Location = new Point(xLocation + 100, yLocation); 
      dayNameLabelList[i].Size = new Size(100, 15); 
      dayNameLabelList[i].Font = new Font("Lucida Sans", 10, FontStyle.Regular); 
      Controls.Add(dayNameLabelList[i]); 

      weatherDescriptionLablList.Add(new Label()); 
      weatherDescriptionLablList[i].Text = _weatherForecast.WeatherList[i].Weather[0].Description; 
      weatherDescriptionLablList[i].Location = new Point(xLocation + 100, yLocation + 15); 
      weatherDescriptionLablList[i].Font = new Font("Lucida Sans", 8, FontStyle.Regular); 
      Controls.Add(weatherDescriptionLablList[i]); 

      gradesLabel.Add(new Label()); 
      gradesLabel[i].Text = _weatherForecast.WeatherList[i].Main.Temperature.ToString("0") + " C°"; 
      gradesLabel[i].Location = new Point(xLocation + 200, yLocation); 
      gradesLabel[i].Font = new Font("Lucida Sans", 10, FontStyle.Regular); 
      Controls.Add(gradesLabel[i]); 

      yLocation += 100; 
     } 

     for (int i = 0; i < dayNameLabelList.Count; i++) 
     { 
      dayNameLabelList[i].ForeColor = Color.White; 
      weatherDescriptionLablList[i].ForeColor = Color.White; 
      gradesLabel[i].ForeColor = Color.White; 
     } 
    } 

Answer 1

あなたはそれが（おそらく両方後者の場合）であればSelectedIndexChangedEvent（それは編集不可能なコンボの場合）、またはTextUpdateEventのいずれかのためにコンボにイベントハンドラを追加する必要があります。これらのイベントハンドラは、必要に応じて他のコントロールを変更します。