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 used this code in WindowsForms comboBox

Usage

comboBox.SetSelectedComboBoxItem("ValueYouWantToSelect");

Add this Class to your project:

public static class AutomationElementExtensions
    { 
        public static void InvokeControl(this AutomationElement element)
        {
            InvokePattern invokePattern = null;

            try
            {
                invokePattern =
                    element.GetCurrentPattern(InvokePattern.Pattern)
                    as InvokePattern;
            }
            catch (ElementNotEnabledException)
            {
                // Object is not enabled
                return;
            }
            catch (InvalidOperationException)
            {
                // object doesn't support the InvokePattern control pattern
                return;
            }

            invokePattern.Invoke();
            Thread.Sleep(500);
        } 


        public static void SetSelectedComboBoxItem(this AutomationElement comboBox, string item)
        {
            AutomationPattern automationPatternFromElement = GetSpecifiedPattern(comboBox, "ExpandCollapsePatternIdentifiers.Pattern");

            ExpandCollapsePattern expandCollapsePattern = comboBox.GetCurrentPattern(automationPatternFromElement) as ExpandCollapsePattern;

            expandCollapsePattern.Expand();



            AutomationElement listItem = comboBox.FindFirst(TreeScope.Subtree, new PropertyCondition(AutomationElement.NameProperty, item));

            InvokeControl(listItem); 
        }

        private static AutomationPattern GetSpecifiedPattern(AutomationElement element, string patternName)
        {
            AutomationPattern[] supportedPattern = element.GetSupportedPatterns();

            foreach (AutomationPattern pattern in supportedPattern)
            {
                if (pattern.ProgrammaticName == patternName)
                    return pattern;
            }

            return null;
        }


    }