selecting combobox item using ui automation

Question

how do I select ComboBox\'s SelectedIndex = -1?

I wrote a code to automate testing:

AutomationElement aeBuildMachine = null;
int count =         


        

Answer 1

I think this might be the easiest way for a simple generic ComobBox value setter this one is fine provided the list items in the ComboBox doesn't have duplicates.

private void SetCombobValueByUIA( AutomationElement ctrl, string newValue )
{ 
    ExpandCollapsePattern exPat = ctrl.GetCurrentPattern(ExpandCollapsePattern.Pattern) 
                                                              as ExpandCollapsePattern;

    if( exPat== null )
    {
        throw new ApplicationException( "Bad Control type..." );
    }

    exPat.Expand();

    AutomationElement itemToSelect = ctrl.FindFirst(TreeScope.Descendants, new
                          PropertyCondition(AutomationElement.NameProperty,newValue));

    SelectionItemPattern sPat = itemToSelect.GetCurrentPattern(
                                              SelectionItemPattern.Pattern)  as SelectionItemPattern ; 
    sPat. Select();
}