unhandle exception "undhandled error in silverlight 2 application" code:4004 .. value out of range

10-06-2008 11:42 AM |

(hope that was the right  translation)

hi im using comboboxes and receiving this error when i switch a value in a combobox and generate it new(see code below), if i didnt switch a value (using the default one) and generate it new, it works without that error

a part of the sourcecode: (_start and _end have values between 1 and 31)

Re: unhandle exception "undhandled error in silverlight 2 application" code:4004 .. value out of range

10-07-2008 12:34 AM |

Hi silverstarter,

this is a problem in the platform that has an easy workaround in app code. What's happening here is that you mark an item as selected that has not been laid out yet. By setting the ItemsSource you are creating implicitely a new collection of combobox items. Those have not received a Layout pass yet by the time you set the SelectedItem property.

To prevent the exception, wait until Layout has happened, or just force Layout to happen from your code:

ComboBoxStart.ItemsSource = comboboxfiller;
ComboBoxEnd.ItemsSource = comboboxfiller;

UpdateLayout();

ComboBoxStart.SelectedItem = _start;
ComboBoxEnd.SelectedItem = _end;

Thanks, Stefan Wick