Slot selection runtime error

[David]

I am getting the following error when a user maked a new appointment and then clicks on a new slot very quickly just after the initial appointment window has closed.  This only occurs if there are allot af appointments 100+ being displayed on the screen and you are very fast in selecting a new slot.  This can be reproduced

Object reference not set to an instance of an object.
   at Telerik.Windows.Controls.ScheduleView.DateSpan..ctor(IDateSpan other)
   at Telerik.Windows.Controls.ScheduleView.SlotSelectionBehavior.GetContiguousSelectionSlot(IDateSpan anchorRange, IDateSpan currentSlot)
   at Telerik.Windows.Controls.ScheduleView.SlotSelectionBehavior.GetSelection(SlotSelectionState state, Slot currentSlot)
   at Telerik.Windows.Controls.ScheduleViewBase.SelectArea(Point clickedPoint)
   at Telerik.Windows.Controls.ScheduleViewBase.OnSlotDragDelta(Point mousePosition)
   at Telerik.Windows.Controls.ScheduleView.DragElementHelper.OnElementMouseMove(Object sender, MouseEventArgs 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)

This is my RadScheduleView XML

<telerik:RadScheduleView x:Name="RadScheduleView" ToolTipTemplate="{StaticResource AppointmentToolTipTemplate}"  

 

AppointmentsSource="{Binding Source={StaticResource ViewModel}, Path=Appointments,Mode=TwoWay}"

SelectedAppointment="{Binding Source={StaticResource ViewModel}, Path=SelectedAppointment,Mode=TwoWay}"

ResourceTypesSource="{Binding Source={StaticResource ViewModel}, Path=ResourceTypes}"

GroupHeaderContentTemplateSelector="{StaticResource GroupHeaderContentTemplateSelector}"

AppointmentCreating="RadScheduleView_AppointmentCreating"

AppointmentEditing="RadScheduleView_AppointmentEditing" ShowDialog="RadScheduleView_ShowDialog"

HorizontalContentAlignment="Left" VerticalContentAlignment="Top"

SelectedSlot="{Binding Source={StaticResource ViewModel}, Path=SelectedSlot,Mode=TwoWay}"

FirstDayOfWeek="Monday">

<I:Interaction.Triggers>

<I:EventTrigger EventName="AppointmentEditing">

<I:InvokeCommandAction Command="{Binding Source={StaticResource ViewModel}, Path=Command_AppointmentEditing}"/>

</I:EventTrigger>

<I:EventTrigger EventName="AppointmentCreating">

<I:InvokeCommandAction Command="{Binding Source={StaticResource ViewModel}, Path=Command_AppointmentCreating}"/>

</I:EventTrigger>

<I:EventTrigger EventName="VisibleRangeChanged">

<I:InvokeCommandAction Command="{Binding Source={StaticResource ViewModel}, Path=Command_VisibleRangeChanged}" CommandParameter="{Binding ElementName=RadScheduleView}" />

</I:EventTrigger>

</I:Interaction.Triggers>

<telerik:RadScheduleView.ViewDefinitions>

<telerik:DayViewDefinition DayStartTime="07:00:00" DayEndTime="19:00:00" MinTimeRulerExtent="1" MinorTickLength="30" />

<telerik:WeekViewDefinition DayStartTime="07:00:00" DayEndTime="19:00:00" MinTimeRulerExtent="1" MinorTickLength="30"/>

<telerik:MonthViewDefinition DayStartTime="07:00:00" DayEndTime="19:00:00" MinTimeRulerExtent="1" />

<telerik:TimelineViewDefinition VisibleDays="1" DayStartTime="07:00:00" DayEndTime="19:00:00" MinTimeRulerExtent="1" MinorTickLength="30" />

</telerik:RadScheduleView.ViewDefinitions>

<telerik:RadScheduleView.GroupDescriptionsSource>

<telerik:GroupDescriptionCollection>

<telerik:ResourceGroupDescription ResourceType="Resource2" />

</telerik:GroupDescriptionCollection>

</telerik:RadScheduleView.GroupDescriptionsSource>  

 

<telerik:RadScheduleView.AppointmentStyleSelector>

<local:AppointmentStyleSelector OutOfService="{StaticResource OutOfServiceStyle}"

MyBooking="{StaticResource MyBookingStyle}"

BookedByOther="{StaticResource BookedByOtherStyle}"

/>

 </telerik:RadScheduleView.AppointmentStyleSelector>

 

[Rosi]

Hello David,

Please try to reproduce the problem with our online demo. If the problem does not persist there I suggest you send us your running project to test it locally.

All the best,
Rosi
the Telerik team