Error 'Value does not fall within the expected range'

[Ron]

I tried to use Content tempalte in order to change the look of DragCue.
I use this code (very similar to your example):

1 ContentControl cue = new ContentControl();
2 cue.ContentTemplate = this.Resources["ShiftTemplateDragImage"] as DataTemplate;
3 cue.Content = lstTemplates.SelectedItem;
4 e.Options.DragCue = cue;

However, when I run my code I got an ecxeption of 'Value does not fall within the expected range' in the third line.
Stack Trace: 
  at MS.Internal.XcpImports.CheckHResult(UInt32 hr)
   at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper obj, DependencyProperty property, DependencyObject doh)
   at MS.Internal.XcpImports.SetValue(INativeCoreTypeWrapper doh, DependencyProperty property, Object obj)
   at System.Windows.DependencyObject.SetObjectValueToCore(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isSetByStyle, Boolean isSetByBuiltInStyle)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value)
   at System.Windows.DependencyObject.SetValue(DependencyProperty dp, Object value)
   at System.Windows.Controls.ContentControl.set_Content(Object value)
   at W6.ClickRoster.Views.W6CRShiftTemplates.OnDragQuery(Object sender, DragDropQueryEventArgs e)

Any ideas?

Thanks in advance

[Miroslav]

Hello Ron,

This error comes up when a visual item, already part of the visual tree (i.e. is generated and has a parent, may not be visible) is added to the visual tree again.

This may be the case with the IstTemplates.SelectedItem.
1. Can you confirm that it is not a visual item
2. If it is a visual item,  it is not part of the visual tree?

Hopefully this will work for you.

Kind regards,
Miroslav
the Telerik team

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[Ron]

Thanks for the quick response.

lstTemplates is a ListBox control that is defined in XAML. I added the event of OnDragQuery to this ListBox in the constructor of this class.

[Miroslav]

Hi Ron,

Since the ListBox is defined in xaml, the SelectedItem may be a ListBoxItem which is a visual item and cannot be visible at two places at the same time.

If indeed the SelectedItem is a ListBoxItem, you can try using its content instead (but then its content also has to be a non-visual item, for the same limitation):

cue.Content = (IstTemplates.SelectedItem as ContentControl).Content;

Does this resolve the error?

Sincerely yours,
Miroslav
the Telerik team

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[Ron]

No :-(
I got 'Object reference not set to an instance of an object'.

[Miroslav]

Hi Ron,

If the DragCue is not an existing visual element, I am not sure what else might be causing this error. 

Could you please provide a sample solution where the issue occurs, so that we will be able to help you quickly? 

You cannot upload directly in the forums, but you can open a support ticker if you wish.

Sincerely yours,
Miroslav
the Telerik team

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[Ron]

Hi,

I have a sample solution of my problem but I can't open a support ticket.
Any other idea how to send you this solution?

Thanks in advance

[Ron]

Eventually, I managed to open a support ticket.
My ticket ID is: 200727.

Thanks.

[Nuno]

Hi Telerik,

I'm having problems setting the DragCue property. I'm getting an exception you can see in the attached file.

My code used to work before upgrading to the 2011 Q2 version.

Here is the code where the problem exists:

private void OnDragQuery(object sender, DragDropQueryEventArgs e)
{
    try
    {
        if (sender is PartContainer)
        {
            e.QueryResult = true;
            if (e.Options.Status == DragStatus.DragQuery)
            {
                e.Options.DragCue = sender;
            }
        }
    }
    catch (Exception ex)
    {
        Global.logAgent.WriteLogEntry(ex);
    }
}

It breakes in this line =>e.Options.DragCue = sender;
Shows an ugly message box and doesn't event fall in the catch section.

I need help asap. Thanks a lot!

Nuno



[Tsvyatko]

Hi Nuno,

 Please, check the answer in the corresponding thread - http://www.telerik.com/community/forums/silverlight/drag-and-drop/2011-q2-release---error-value-does-not-fall-within-the-expected-range.aspx

Kind regards,
Tsvyatko
the Telerik team