[Solved] RadDatePicker and RadDateTimePicker ToolTip display Error Message

[Thiru]

Hi Techies,

I do not have any run time issue but when i load the screen, i am getting the Below error message in Custom Validation part.

System.Windows.Data Error: 17 : Cannot get 'Item[]' value (type 'ValidationError') from '(Validation.Errors)' (type 'ReadOnlyObservableCollection`1'). BindingExpression:Path=(0)[0].ErrorContent; DataItem='RadDatePicker' (Name='EventStartDateTimePicker'); target element is 'RadDatePicker' (Name='EventStartDateTimePicker'); target property is 'ToolTip' (type 'Object') ArgumentOutOfRangeException:'System.ArgumentOutOfRangeException: Specified argument was out of the range of valid values.

I have to resolve this issue. Why this above error is displaying? Below i have given the Xaml Part. This is what i am using

<tk:RadDatePicker Grid.Row="3" Grid.Column="0" TabIndex="2" Padding="3,2,0,0" 

Width="85" Height="25" DateTimeWatermarkContent=" " FontSize="11.5" 

x:Name="EventEndDateTimePicker" FontFamily="MyriadPro-Regular" 

IsTooltipEnabled="False" SelectedValue="{Binding RelativeSource={RelativeSource 

FindAncestor, AncestorType={x:Type UserControl}}, 

Path=DataContext.ViewData.EventDetail.EndDate,UpdateSourceTrigger=PropertyChanged, 

Mode=TwoWay,NotifyOnSourceUpdated=True,ValidatesOnDataErrors=True}" 

self:RadDatePickerHelper.IsFreeTextAllowed="True" 

self:RadDatePickerHelper.ShortDateFormat="MM/dd/yyyy" 

lib:Event.Binding="SelectionChanged.[DateChangeValidation]" 

compass:RadDateTimePickerHelper.EnableCustomFeatures="True" 

compass:RadDateTimePickerHelper.EnableIsCurrentDateRequiredOnDoubleClick="False" 

AllowDrop="False"><BR><tk:RadDatePicker.Style><BR><Style 

TargetType="{x:Type tk:RadDatePicker}" BasedOn="{StaticResource 

DatePickerStyle}"><BR><Style.Triggers><BR><Trigger 

Property="Validation.HasError" Value="True"><BR><Setter Property="ToolTip" 

Value="{Binding RelativeSource={RelativeSource Self}, 

Path=(Validation.Errors)[0].ErrorContent}" 

/><BR></Trigger><BR></Style.Triggers><BR></Style><BR></tk:RadDatePicker.Style><BR></tk:RadDatePicker><BR><BR>

​

Please help me to get ride of this binding error on loading the screen.

regards
Thiruppathi V

[Yana]

Hello Thiru,

The error indicates some issue with the validation of the DatePicker value, however, without debugging the VIewModel where the validation logic is implemented, it is not possible for us to tell the exact reason. That's why I'd ask you to try to isolate the problem in a simple project and send it to us, so we to be able to test and debug it locally.

Thanks you for your cooperation.

Regards,
Yana
Telerik

 

 

[Thiru]

Hi Yana's,

Thanks for your reply.

I have fixed this issue. I have used the binding like below.

<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors).CurrentItem.ErrorContent}" />

Earlier, we have bound the Tooltip value like below.


<Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors).[0].ErrorContent}" />


Regards
Thiruppathi V