SelectedDate is updated later after SelectionChanged event invoked

[Hao]

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!!!
        }

[Yana]

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

[Hao]

Thanks a lot. Problem solved!!