使用UI Automation实现自动化测试--4.2 （ExpandCollapsePattern）

ExpandCollapsePattern

表示以可视方式进行展开（以显示内容）和折叠（以隐藏内容）的控件。例如ComboBox控件支持ExpandCollapsePattern。

ExpandCollapsePattern有两个主要方法：

Expand()方法：隐藏 AutomationElement 的全部子代节点、控件或内容。

Collapse()方法：显示 AutomationElement 的全部子节点、控件或内容。

      以下代码是用ExpandCollapsePattern来测试ComboBox控件的Expand和Collapse。

using System;
using System.Text;
using System.Diagnostics;
using System.Threading;
using System.Windows.Automation;

namespace UIATest
{
    class Program
    {
        static void Main(string[] args)
        {
            Process process = Process.Start(@"F:\CSharpDotNet\AutomationTest\ATP\WpfApp\bin\Debug\WpfApp.exe");
            int processId = process.Id;
            AutomationElement element = FindElementById(processId, "comboBox1");
            ExpandCollapsePattern currentPattern = GetExpandCollapsePattern(element);
            currentPattern.Expand();
            Thread.Sleep(1000);
            currentPattern.Collapse();
        }

        /**//// <summary>
        /// Get the automation elemention of current form.
        /// </summary>
        /// <param name="processId">Process Id</param>
        /// <returns>Target element</returns>
        public static AutomationElement FindWindowByProcessId(int processId)
        {
            AutomationElement targetWindow = null;
            int count = 0;
            try
            {
                Process p = Process.GetProcessById(processId);
                targetWindow = AutomationElement.FromHandle(p.MainWindowHandle);
                return targetWindow;
            }
            catch (Exception ex)
            {
                count++;
                StringBuilder sb = new StringBuilder();
                string message = sb.AppendLine(string.Format("Target window is not existing.try #{0}", count)).ToString();
                if (count > 5)
                {
                    throw new InvalidProgramException(message, ex);
                }
                else
                {
                    return FindWindowByProcessId(processId);
                }
            }
        }


        /**//// <summary>
        /// Get the automation element by automation Id.
        /// </summary>
        /// <param name="windowName">Window name</param>
        /// <param name="automationId">Control automation Id</param>
        /// <returns>Automatin element searched by automation Id</returns>
        public static AutomationElement FindElementById(int processId, string automationId)
        {
            AutomationElement aeForm = FindWindowByProcessId(processId);
            AutomationElement tarFindElement = aeForm.FindFirst(TreeScope.Descendants,
            new PropertyCondition(AutomationElement.AutomationIdProperty, automationId));
            return tarFindElement;
        }

        ExpandCollapsePattern helper#region ExpandCollapsePattern helper

        /**//// <summary>
        /// Get ExpandCollapsePattern
        /// </summary>
        /// <param name="element">AutomationElement instance</param>
        /// <returns>ExpandCollapsePattern instance</returns>
        public static ExpandCollapsePattern GetExpandCollapsePattern(AutomationElement element)
        {
            object currentPattern;
            if (!element.TryGetCurrentPattern(ExpandCollapsePattern.Pattern, out currentPattern))
            {
                throw new Exception(string.Format("Element with AutomationId '{0}' and Name '{1}' does not support the ExpandCollapsePattern.",
                    element.Current.AutomationId, element.Current.Name));
            }
            return currentPattern as ExpandCollapsePattern;
        }

        #endregion
    }
}

      以下代码为被测程序的xaml文件：

 1<Window x:Class="WpfApp.Window1"
 2    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
 3    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
 4    Title="Window1" Height="219" Width="353">
 5    <Grid>
 6        <ComboBox Name="comboBox1" Height="23" VerticalAlignment="Top" Margin="94,58,0,0" HorizontalAlignment="Left" Width="119">
 7            <ComboBoxItem>kaden</ComboBoxItem>
 8            <ComboBoxItem>sam</ComboBoxItem>
 9        </ComboBox>
10    </Grid>
11</Window>
12

Summary

本文主要是对ExpandCollapsePattern 做简单的介绍，并使用ExpandCollapsePattern来操作ComboBox控件，对ComboBox进行Expand和Collapse操作。