Home / Community & Support / Developer Productivity Tools Forums / Silverlight > DatePicker > SelectedDate is updated later after SelectionChanged event invoked

• Hao

  Posted on Sep 19, 2011 (permalink)

  Hi Telerik,
  
  I have a RadDatePicker and its SelectedDate value is binding with BeginDate property. What I want to do is to update other RadDatePicker when this RadDatePicker's value gets changed.
  
  However, after SelectionChanged event is invoked, I still get the old date value inside the Command. When the event get finished, the property is finally updated. So I am not able to update the other RadDatePicker after SelectionChanged is invoked.
  
  Could you please to help me with this? Thanks.
  
  Hao L
  
  
  Below is my codes:
  ----------------------------------------------------------------
  //View [xaml]:
  

  <telerik:RadDatePicker Name="BeginDatePicker" Width="100" telerik:StyleManager.Theme="Metro" SelectedDate="{Binding Source={StaticResource ClrStmtControlViewModel}, Path=BeginDate, Mode=TwoWay}" IsReadOnly="False">

      <i:Interaction.Triggers>

          <i:EventTrigger EventName="SelectionChanged">

              <i:InvokeCommandAction Command="{Binding Source={StaticResource ClrStmtControlViewModel}, Path=OnBeginDatePickerSelectionChangedCommand, Mode=OneWay}"/>

          </i:EventTrigger>

      </i:Interaction.Triggers>

  </telerik:RadDatePicker>

  
  //View Model:
  
  

  //Property

          private DateTime _BeginDate;

          public DateTime BeginDate

          {

              get { return _BeginDate; }

              set

              {

                  _BeginDate = value;

                  RaisePropertyChanged("BeginDate");

              }

          }

   

  //Command

          private readonly ICommand _OnBeginDatePickerSelectionChangedCommand;

          public ICommand OnBeginDatePickerSelectionChangedCommand

          {

              get

              {

                  return _OnBeginDatePickerSelectionChangedCommand;

              }

          }

          private void BeginDatePicker_SelectionChanged()

          {

              AppMessaging.UpdateBeginDateMessage.Send(BeginDate); //BUT THE DATE IS NOT CHANGED HERE!!!

          }

  
  
  

  Reply

• Answer Yana Yana

  Posted on Sep 26, 2011 (permalink)

  Hi Hao,
  
  Please try setting CommandParameter like this:
  
  

  <telerik:RadDatePicker Name="BeginDatePicker" Width="100" telerik:StyleManager.Theme="Metro"

                          SelectedDate="{Binding Source={StaticResource ClrStmtControlViewModel}, Path=BeginDate, Mode=TwoWay}" IsReadOnly="False">

      <i:Interaction.Triggers>

          <i:EventTrigger EventName="SelectionChanged">

              <i:InvokeCommandAction

                  Command="{Binding Source={StaticResource ClrStmtControlViewModel}, Path=OnBeginDatePickerSelectionChangedCommand, Mode=OneWay}"

                  CommandParameter="{Binding ElementName=BeginDatePicker}" />

          </i:EventTrigger>

      </i:Interaction.Triggers>

  </telerik:RadDatePicker>

  
  and then find the date in the event handler like this:
  
  

  private void BeginDatePicker_SelectionChanged(object param)

  {

    var selectedValue = (param as RadDatePicker).SelectedValue;       

  }

  
  
  Best wishes,
  Yana
  the Telerik team

  Explore the entire Telerik portfolio by downloading the Ultimate Collection trial package. Get it now >>

  Reply

• Hao

  Posted on Sep 26, 2011 (permalink)

  Thanks a lot. Problem solved!!

  Reply

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