UWP TimePicker MVVM












0















I am having problems getting the Time property of the TimePicker into my ViewModel.The method on the ViewModel



TimePickerTimeSelected()


is called but BEFORE the Time property is updated.



private DateTimeOffset _datePickerValue;
public DateTimeOffset datePickerValue
{
get => _datePickerValue;
set => SetProperty(ref _datePickerValue, value);
}


Here isthe XAML



<TimePicker
Name="timePicker"
Time="{x:Bind viewModel.timePickerValue,Mode=TwoWay}"
TimeChanged="{x:Bind viewModel.TimePickerTimeSelected,Mode=TwoWay}">


I want to do some processing with the time when it is selected in the control but the method is called before the timePickerValue is updated.How do I get the new time? ViewModel method:



  public void TimePickerTimeSelected()
{

}









share|improve this question



























    0















    I am having problems getting the Time property of the TimePicker into my ViewModel.The method on the ViewModel



    TimePickerTimeSelected()


    is called but BEFORE the Time property is updated.



    private DateTimeOffset _datePickerValue;
    public DateTimeOffset datePickerValue
    {
    get => _datePickerValue;
    set => SetProperty(ref _datePickerValue, value);
    }


    Here isthe XAML



    <TimePicker
    Name="timePicker"
    Time="{x:Bind viewModel.timePickerValue,Mode=TwoWay}"
    TimeChanged="{x:Bind viewModel.TimePickerTimeSelected,Mode=TwoWay}">


    I want to do some processing with the time when it is selected in the control but the method is called before the timePickerValue is updated.How do I get the new time? ViewModel method:



      public void TimePickerTimeSelected()
    {

    }









    share|improve this question

























      0












      0








      0








      I am having problems getting the Time property of the TimePicker into my ViewModel.The method on the ViewModel



      TimePickerTimeSelected()


      is called but BEFORE the Time property is updated.



      private DateTimeOffset _datePickerValue;
      public DateTimeOffset datePickerValue
      {
      get => _datePickerValue;
      set => SetProperty(ref _datePickerValue, value);
      }


      Here isthe XAML



      <TimePicker
      Name="timePicker"
      Time="{x:Bind viewModel.timePickerValue,Mode=TwoWay}"
      TimeChanged="{x:Bind viewModel.TimePickerTimeSelected,Mode=TwoWay}">


      I want to do some processing with the time when it is selected in the control but the method is called before the timePickerValue is updated.How do I get the new time? ViewModel method:



        public void TimePickerTimeSelected()
      {

      }









      share|improve this question














      I am having problems getting the Time property of the TimePicker into my ViewModel.The method on the ViewModel



      TimePickerTimeSelected()


      is called but BEFORE the Time property is updated.



      private DateTimeOffset _datePickerValue;
      public DateTimeOffset datePickerValue
      {
      get => _datePickerValue;
      set => SetProperty(ref _datePickerValue, value);
      }


      Here isthe XAML



      <TimePicker
      Name="timePicker"
      Time="{x:Bind viewModel.timePickerValue,Mode=TwoWay}"
      TimeChanged="{x:Bind viewModel.TimePickerTimeSelected,Mode=TwoWay}">


      I want to do some processing with the time when it is selected in the control but the method is called before the timePickerValue is updated.How do I get the new time? ViewModel method:



        public void TimePickerTimeSelected()
      {

      }






      mvvm uwp-xaml






      share|improve this question













      share|improve this question











      share|improve this question




      share|improve this question










      asked Nov 22 '18 at 14:03









      Paul StanleyPaul Stanley

      642722




      642722
























          1 Answer
          1






          active

          oldest

          votes


















          1














          In your Xaml you are setting Mode=TwoWay to TimeChanged Event which is invalid, as TmeChange is an Event and not a DependencyProperty.



          In order to achieve the desired output please refer to the below code:



          Xaml:



          <TimePicker
          Name="timePicker"
          Time="{x:Bind ViewModel.TimePickerValue, Mode=TwoWay}"
          TimeChanged="{x:Bind ViewModel.TestTimeChangedEvent}"/>


          ViewModel:



            private TimeSpan _timePickerValue;
          public TimeSpan TimePickerValue
          {
          get { return _timePickerValue; }
          set { _timePickerValue = value;}
          }

          public void TestTimeChangedEvent(object sender, TimePickerValueChangedEventArgs e)
          {
          TimePickerValue = e.NewTime;
          }


          EDIT



          As you don't want to use TimePickerValueChangedEventArgs in your ViewModel, you have to create a custom behavior to get the selected time in your VM.



          XAML:



           <TimePicker
          Name="timePicker">
          <Interactivity:Interaction.Behaviors>
          <behaviors:TimeChangedEventBehavior/>
          </Interactivity:Interaction.Behaviors>
          </TimePicker>


          Behavior:



            public sealed class TimeChangedEventBehavior : DependencyObject, IBehavior
          {
          public DependencyObject AssociatedObject { get; private set; }

          public void Attach(DependencyObject associatedObject)
          {
          if (!(associatedObject is TimePicker tp))
          {
          throw new ArgumentException("Error Associating Object");
          }

          this.AssociatedObject = associatedObject;

          tp.TimeChanged += OnTimeChanged;
          }

          private void OnTimeChanged(object sender, TimePickerValueChangedEventArgs e)
          {
          var timePicker = (sender as TimePicker);
          var mainVM = (timePicker.DataContext as MainViewModel);
          mainVM.OnTimePickerTimeSelected(timePicker.Time);
          }

          public void Detach()
          {
          if (this.AssociatedObject is TimePicker tp)
          {
          tp.TimeChanged -= this.OnTimeChanged;
          }
          }
          }


          ViewModel:



           public void OnTimePickerTimeSelected(TimeSpan selectedTime)
          {
          // Your Logic
          }





          share|improve this answer


























          • Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

            – Paul Stanley
            Nov 23 '18 at 7:38











          • @PaulStanley Please refer to my edited answer

            – Dishant
            Nov 25 '18 at 23:18






          • 1





            Thank you for your comprehensive answer.Awesome Sir!

            – Paul Stanley
            Nov 26 '18 at 17:48











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          1 Answer
          1






          active

          oldest

          votes








          1 Answer
          1






          active

          oldest

          votes









          active

          oldest

          votes






          active

          oldest

          votes









          1














          In your Xaml you are setting Mode=TwoWay to TimeChanged Event which is invalid, as TmeChange is an Event and not a DependencyProperty.



          In order to achieve the desired output please refer to the below code:



          Xaml:



          <TimePicker
          Name="timePicker"
          Time="{x:Bind ViewModel.TimePickerValue, Mode=TwoWay}"
          TimeChanged="{x:Bind ViewModel.TestTimeChangedEvent}"/>


          ViewModel:



            private TimeSpan _timePickerValue;
          public TimeSpan TimePickerValue
          {
          get { return _timePickerValue; }
          set { _timePickerValue = value;}
          }

          public void TestTimeChangedEvent(object sender, TimePickerValueChangedEventArgs e)
          {
          TimePickerValue = e.NewTime;
          }


          EDIT



          As you don't want to use TimePickerValueChangedEventArgs in your ViewModel, you have to create a custom behavior to get the selected time in your VM.



          XAML:



           <TimePicker
          Name="timePicker">
          <Interactivity:Interaction.Behaviors>
          <behaviors:TimeChangedEventBehavior/>
          </Interactivity:Interaction.Behaviors>
          </TimePicker>


          Behavior:



            public sealed class TimeChangedEventBehavior : DependencyObject, IBehavior
          {
          public DependencyObject AssociatedObject { get; private set; }

          public void Attach(DependencyObject associatedObject)
          {
          if (!(associatedObject is TimePicker tp))
          {
          throw new ArgumentException("Error Associating Object");
          }

          this.AssociatedObject = associatedObject;

          tp.TimeChanged += OnTimeChanged;
          }

          private void OnTimeChanged(object sender, TimePickerValueChangedEventArgs e)
          {
          var timePicker = (sender as TimePicker);
          var mainVM = (timePicker.DataContext as MainViewModel);
          mainVM.OnTimePickerTimeSelected(timePicker.Time);
          }

          public void Detach()
          {
          if (this.AssociatedObject is TimePicker tp)
          {
          tp.TimeChanged -= this.OnTimeChanged;
          }
          }
          }


          ViewModel:



           public void OnTimePickerTimeSelected(TimeSpan selectedTime)
          {
          // Your Logic
          }





          share|improve this answer


























          • Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

            – Paul Stanley
            Nov 23 '18 at 7:38











          • @PaulStanley Please refer to my edited answer

            – Dishant
            Nov 25 '18 at 23:18






          • 1





            Thank you for your comprehensive answer.Awesome Sir!

            – Paul Stanley
            Nov 26 '18 at 17:48
















          1














          In your Xaml you are setting Mode=TwoWay to TimeChanged Event which is invalid, as TmeChange is an Event and not a DependencyProperty.



          In order to achieve the desired output please refer to the below code:



          Xaml:



          <TimePicker
          Name="timePicker"
          Time="{x:Bind ViewModel.TimePickerValue, Mode=TwoWay}"
          TimeChanged="{x:Bind ViewModel.TestTimeChangedEvent}"/>


          ViewModel:



            private TimeSpan _timePickerValue;
          public TimeSpan TimePickerValue
          {
          get { return _timePickerValue; }
          set { _timePickerValue = value;}
          }

          public void TestTimeChangedEvent(object sender, TimePickerValueChangedEventArgs e)
          {
          TimePickerValue = e.NewTime;
          }


          EDIT



          As you don't want to use TimePickerValueChangedEventArgs in your ViewModel, you have to create a custom behavior to get the selected time in your VM.



          XAML:



           <TimePicker
          Name="timePicker">
          <Interactivity:Interaction.Behaviors>
          <behaviors:TimeChangedEventBehavior/>
          </Interactivity:Interaction.Behaviors>
          </TimePicker>


          Behavior:



            public sealed class TimeChangedEventBehavior : DependencyObject, IBehavior
          {
          public DependencyObject AssociatedObject { get; private set; }

          public void Attach(DependencyObject associatedObject)
          {
          if (!(associatedObject is TimePicker tp))
          {
          throw new ArgumentException("Error Associating Object");
          }

          this.AssociatedObject = associatedObject;

          tp.TimeChanged += OnTimeChanged;
          }

          private void OnTimeChanged(object sender, TimePickerValueChangedEventArgs e)
          {
          var timePicker = (sender as TimePicker);
          var mainVM = (timePicker.DataContext as MainViewModel);
          mainVM.OnTimePickerTimeSelected(timePicker.Time);
          }

          public void Detach()
          {
          if (this.AssociatedObject is TimePicker tp)
          {
          tp.TimeChanged -= this.OnTimeChanged;
          }
          }
          }


          ViewModel:



           public void OnTimePickerTimeSelected(TimeSpan selectedTime)
          {
          // Your Logic
          }





          share|improve this answer


























          • Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

            – Paul Stanley
            Nov 23 '18 at 7:38











          • @PaulStanley Please refer to my edited answer

            – Dishant
            Nov 25 '18 at 23:18






          • 1





            Thank you for your comprehensive answer.Awesome Sir!

            – Paul Stanley
            Nov 26 '18 at 17:48














          1












          1








          1







          In your Xaml you are setting Mode=TwoWay to TimeChanged Event which is invalid, as TmeChange is an Event and not a DependencyProperty.



          In order to achieve the desired output please refer to the below code:



          Xaml:



          <TimePicker
          Name="timePicker"
          Time="{x:Bind ViewModel.TimePickerValue, Mode=TwoWay}"
          TimeChanged="{x:Bind ViewModel.TestTimeChangedEvent}"/>


          ViewModel:



            private TimeSpan _timePickerValue;
          public TimeSpan TimePickerValue
          {
          get { return _timePickerValue; }
          set { _timePickerValue = value;}
          }

          public void TestTimeChangedEvent(object sender, TimePickerValueChangedEventArgs e)
          {
          TimePickerValue = e.NewTime;
          }


          EDIT



          As you don't want to use TimePickerValueChangedEventArgs in your ViewModel, you have to create a custom behavior to get the selected time in your VM.



          XAML:



           <TimePicker
          Name="timePicker">
          <Interactivity:Interaction.Behaviors>
          <behaviors:TimeChangedEventBehavior/>
          </Interactivity:Interaction.Behaviors>
          </TimePicker>


          Behavior:



            public sealed class TimeChangedEventBehavior : DependencyObject, IBehavior
          {
          public DependencyObject AssociatedObject { get; private set; }

          public void Attach(DependencyObject associatedObject)
          {
          if (!(associatedObject is TimePicker tp))
          {
          throw new ArgumentException("Error Associating Object");
          }

          this.AssociatedObject = associatedObject;

          tp.TimeChanged += OnTimeChanged;
          }

          private void OnTimeChanged(object sender, TimePickerValueChangedEventArgs e)
          {
          var timePicker = (sender as TimePicker);
          var mainVM = (timePicker.DataContext as MainViewModel);
          mainVM.OnTimePickerTimeSelected(timePicker.Time);
          }

          public void Detach()
          {
          if (this.AssociatedObject is TimePicker tp)
          {
          tp.TimeChanged -= this.OnTimeChanged;
          }
          }
          }


          ViewModel:



           public void OnTimePickerTimeSelected(TimeSpan selectedTime)
          {
          // Your Logic
          }





          share|improve this answer















          In your Xaml you are setting Mode=TwoWay to TimeChanged Event which is invalid, as TmeChange is an Event and not a DependencyProperty.



          In order to achieve the desired output please refer to the below code:



          Xaml:



          <TimePicker
          Name="timePicker"
          Time="{x:Bind ViewModel.TimePickerValue, Mode=TwoWay}"
          TimeChanged="{x:Bind ViewModel.TestTimeChangedEvent}"/>


          ViewModel:



            private TimeSpan _timePickerValue;
          public TimeSpan TimePickerValue
          {
          get { return _timePickerValue; }
          set { _timePickerValue = value;}
          }

          public void TestTimeChangedEvent(object sender, TimePickerValueChangedEventArgs e)
          {
          TimePickerValue = e.NewTime;
          }


          EDIT



          As you don't want to use TimePickerValueChangedEventArgs in your ViewModel, you have to create a custom behavior to get the selected time in your VM.



          XAML:



           <TimePicker
          Name="timePicker">
          <Interactivity:Interaction.Behaviors>
          <behaviors:TimeChangedEventBehavior/>
          </Interactivity:Interaction.Behaviors>
          </TimePicker>


          Behavior:



            public sealed class TimeChangedEventBehavior : DependencyObject, IBehavior
          {
          public DependencyObject AssociatedObject { get; private set; }

          public void Attach(DependencyObject associatedObject)
          {
          if (!(associatedObject is TimePicker tp))
          {
          throw new ArgumentException("Error Associating Object");
          }

          this.AssociatedObject = associatedObject;

          tp.TimeChanged += OnTimeChanged;
          }

          private void OnTimeChanged(object sender, TimePickerValueChangedEventArgs e)
          {
          var timePicker = (sender as TimePicker);
          var mainVM = (timePicker.DataContext as MainViewModel);
          mainVM.OnTimePickerTimeSelected(timePicker.Time);
          }

          public void Detach()
          {
          if (this.AssociatedObject is TimePicker tp)
          {
          tp.TimeChanged -= this.OnTimeChanged;
          }
          }
          }


          ViewModel:



           public void OnTimePickerTimeSelected(TimeSpan selectedTime)
          {
          // Your Logic
          }






          share|improve this answer














          share|improve this answer



          share|improve this answer








          edited Nov 25 '18 at 23:18

























          answered Nov 22 '18 at 23:52









          DishantDishant

          899612




          899612













          • Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

            – Paul Stanley
            Nov 23 '18 at 7:38











          • @PaulStanley Please refer to my edited answer

            – Dishant
            Nov 25 '18 at 23:18






          • 1





            Thank you for your comprehensive answer.Awesome Sir!

            – Paul Stanley
            Nov 26 '18 at 17:48



















          • Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

            – Paul Stanley
            Nov 23 '18 at 7:38











          • @PaulStanley Please refer to my edited answer

            – Dishant
            Nov 25 '18 at 23:18






          • 1





            Thank you for your comprehensive answer.Awesome Sir!

            – Paul Stanley
            Nov 26 '18 at 17:48

















          Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

          – Paul Stanley
          Nov 23 '18 at 7:38





          Yes thanks that does indeed work but your taking a dependency on the UI with the TimePickerVaueChanged which I was hoping to avoid. Is there a way to use MVVM ? You would normally set the property in the viewmodel and that's how you get the value. There would be no reason to have the timePickerVaue otherwise.

          – Paul Stanley
          Nov 23 '18 at 7:38













          @PaulStanley Please refer to my edited answer

          – Dishant
          Nov 25 '18 at 23:18





          @PaulStanley Please refer to my edited answer

          – Dishant
          Nov 25 '18 at 23:18




          1




          1





          Thank you for your comprehensive answer.Awesome Sir!

          – Paul Stanley
          Nov 26 '18 at 17:48





          Thank you for your comprehensive answer.Awesome Sir!

          – Paul Stanley
          Nov 26 '18 at 17:48




















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