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

This is what worked for me.

    /// 

    /// Extension method to select item from comboxbox
    /// 
    /// Combobox Element
    /// Item to select
    /// 
    public static bool SelectComboboxItem(this AutomationElement comboBox, string item)
    {
        if (comboBox == null) return false;
        // Get the list box within the combobox
        AutomationElement listBox = comboBox.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List));
        if (listBox == null) return false;
        // Search for item within the listbox
        AutomationElement listItem = listBox.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.NameProperty, item));
        if (listItem == null) return false;
        // Check if listbox item has SelectionItemPattern
        object objPattern;
        if (true == listItem.TryGetCurrentPattern(SelectionItemPatternIdentifiers.Pattern, out objPattern))
        {
            SelectionItemPattern selectionItemPattern = objPattern as SelectionItemPattern;
            selectionItemPattern.Select(); // Invoke Selection
            return true;
        }
        return false;
    }

Usage

        AutomationElement paymentCombobox = element.FindFirst(
            TreeScope.Children,
            new PropertyCondition(AutomationElement.NameProperty, "cbPayment")
        );
        paymentCombobox.SelectComboboxItem("Cash");

resource https://msdn.microsoft.com/en-us/library/ms752305(v=vs.110).aspx