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Binding PeriodStart and PeriodEnd

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TimeBar
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Tomáš Čeleda
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Tomáš Čeleda asked on 10 Jun 2011, 03:45 PM

I've got a problem with binding PeriodStart and PeriodEnd property of Silverlight control rad TimeBar. If I try to set them statically in xaml code, everything works fine. But I need to set boundaries of TimeBar dynamically. I tried trivial property binding with no success. If PeriodEnd and PeriodStart properties are in the xaml in such order like in the code snippet I get an Exception. When I try to switch the order, nothing happens and time boundaries of the timebar are not set.

 

Here is a code snippet:

<telerik:RadTimeBar  PeriodEnd="{Binding EndDate}" PeriodStart="{Binding StartDate}" />

underlying ViewModel:

           private DateTime _startDate;
        public DateTime StartDate
        {
            get
            {
                return new DateTime(2011, 1, 1);
            }
            set
            {
                if (_startDate != value)
                {
                    _startDate = value;
                    NotifyPropertyChanged("StartDate");
                }
            }
        }
 
        private DateTime _endDate;
        public DateTime EndDate
        {
            get
            {
                return new DateTime(2011, 6, 1);
            }
            set
            {
                if (_endDate != value)
                {
                    _endDate = value;
                    NotifyPropertyChanged("EndDate");
                }
            }
        }

The exception occurs when the View is bound to my ViewModel:
System.ArgumentOutOfRangeException was unhandled by user code
  Message=The added or subtracted value results in an un-representable DateTime.
Parameter name: value
  StackTrace:
       at System.DateTime.AddTicks(Int64 value)
       at System.DateTime.Add(Double value, Int32 scale)
       at System.DateTime.AddDays(Double value)
       at Telerik.Windows.Controls.TimeBar.WeekInterval.ExtractIntervalStart(DateTime date)
       at Telerik.Windows.Controls.TimeBar.PeriodSpanGenerator.GenerateModels(DateTime periodStart, DateTime periodEnd, Func`2 extractIntervalStartAction, Func`2 incrementAction)
       at Telerik.Windows.Controls.TimeBar.IntervalDescriptor.UpdatePeriods(DateTime periodStart, DateTime periodEnd)
       at Telerik.Windows.Controls.RadTimeBar.SynchronizeIntervalDescriptors()
       at Telerik.Windows.Controls.RadTimeBar.OnDurationChanged()
       at Telerik.Windows.Controls.RadTimeBar.OnPeriodRangePropertyChanged(DependencyObject sender, DependencyPropertyChangedEventArgs e)
       at Telerik.Windows.PropertyMetadata.<>c__DisplayClass1.<Create>b__0(DependencyObject d, DependencyPropertyChangedEventArgs e)
       at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
       at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
       at System.Windows.DependencyObject.RefreshExpression(DependencyProperty dp)
       at System.Windows.Data.BindingExpression.SendDataToTarget()
       at System.Windows.Data.BindingExpression.SourceAcquired()
       at System.Windows.Data.BindingExpression.System.Windows.IDataContextChangedListener.OnDataContextChanged(Object sender, DataContextChangedEventArgs e)
       at System.Windows.Data.BindingExpression.DataContextChanged(Object sender, DataContextChangedEventArgs e)
       at System.Windows.DataContextChangedEventHandler.Invoke(Object sender, DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnAncestorDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.NotifyDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnAncestorDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.NotifyDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnAncestorDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.NotifyDataContextChanged(DataContextChangedEventArgs e)
       at System.Windows.FrameworkElement.OnPropertyChanged(DependencyProperty dp)
       at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
       at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
       at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet)
       at System.Windows.FrameworkElement.set_DataContext(Object value)
       at DealData.MainPage..ctor()
       at DealData.App.Application_Startup(Object sender, StartupEventArgs e)
       at MS.Internal.CoreInvokeHandler.InvokeEventHandler(Int32 typeIndex, Delegate handlerDelegate, Object sender, Object args)
       at MS.Internal.JoltHelper.FireEvent(IntPtr unmanagedObj, IntPtr unmanagedObjArgs, Int32 argsTypeIndex, Int32 actualArgsTypeIndex, String eventName)

I tried this with SL4, Q1 2011 official release and with your latest internal build 2011.1.0606. Both versions produce the same error.

Thank you,
Best Regards
Tomas

2 Answers, 1 is accepted

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Vladimir Milev
Telerik team
answered on 14 Jun 2011, 02:20 PM
Hi Tomáš Čeleda,

Try using a TwoWay binding for these properties. This is required because of the coercing of the values that happens when a binding is executed.

Kind regards,
Vladimir Milev
the Telerik team
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Tomáš Čeleda
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Rank 2
answered on 15 Jun 2011, 11:31 AM
Thank you very much. Two way binding has solved the issue.

Best Regards,
Tomas Celeda
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TimeBar
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Tomáš Čeleda
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Vladimir Milev
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Tomáš Čeleda
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