UIA: Choose item in Combobox

Use UI Automation, to choose an item in Combobox, code like this:

using System.Windows.Automation;

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

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

            expandCollapsePattern.Expand();
            expandCollapsePattern.Collapse();

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

            automationPatternFromElement = GetSpecifiedPattern(listItem, "SelectionItemPatternIdentifiers.Pattern");

            SelectionItemPattern selectionItemPattern = listItem.GetCurrentPattern(automationPatternFromElement) as SelectionItemPattern;

            selectionItemPattern.Select();
        }

        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;
        }

在网上找到这段代码， 发现能用呢！ 哈啊哈