UIAutomation测试WPF桌面程序之ComboBox测试

                //启动被测试的程序
                Process p = Process.Start("测试程序路径");
                //自动化根元素
                AutomationElement aeDeskTop = AutomationElement.RootElement;
                //启动程序的时间
                Thread.Sleep(3000);
                //获取到程序的主界面
                AutomationElement aeFrom = AutomationElement.FromHandle(p.MainWindowHandle);
                //用于获取到程序的主界面计数
                int numWaits = 0;

                do
                {
                    //查找第一个自动化元素
                    aeFrom = aeDeskTop.FindFirst(TreeScope.Children,
                        new PropertyCondition(AutomationElement.NameProperty, "MainWindow"));
                } while (null == aeFrom && numWaits < 50);//限制
                //主界面为空时抛出异常
                if (null == aeFrom)
                {
                    throw new NullReferenceException("启动测试失败");
                }

                AutomationElement aeComboBox = aeFrom.FindFirst(TreeScope.Children, new PropertyCondition(AutomationElement.AutomationIdProperty, "cbbProductCode"));

                ExpandCollapsePattern expandPattern = (ExpandCollapsePattern)aeComboBox.GetCurrentPattern(ExpandCollapsePattern.Pattern);
                //重点来了，先要将ComBox展开后才能进行选择
                expandPattern.Expand();

                AutomationElementCollection rows = aeComboBox.FindAll(TreeScope.Subtree, new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.ListItem));

                AutomationElement comboboxItem = (AutomationElement)rows[i];
                    
                SelectionItemPattern selectPattern = (SelectionItemPattern)comboboxItem.GetCurrentPattern(SelectionItemPattern.Pattern);

                selectPattern.Select();