支持SelectionItemPattern的控件有ListView、ListBox、RadioButton、GridView等。
1. SelectionItemPattern的三个重要方法：
1. AddToSelection：将当前元素添加到所选项的集合。
2. RemoveFromSelection: 从选定项的集合中移除当前元素。
3. Select: 取消所有已选中的项，然后选择当前元素。
2. SelectionItemPattern的Current属性
可通过Current属性的IsSelected属性来判断AutomationElement是否被selected.
如下代码演示了使用SelectionItemPattern来操作RadioButton控件。
Code
1
using System;
2using System.Text;
3using System.Diagnostics;
4using System.Threading;
5using System.Windows.Automation;
6
7namespace UIATest
8
{
9
class Program
10
{
11 static void Main(string[] args)
12 {
13 Process process = Process.Start(@"F:\CSharpDotNet\AutomationTest\ATP\WpfApp\bin\Debug\WpfApp.exe");
14 int processId = process.Id;
15
16 AutomationElement element = FindElementById(processId, "radioButton1");
17 SelectionItemPattern selectionItemPattern = GetSelectionItemPattern(element);
18 selectionItemPattern.Select();
19
}
20
21 /**//// <summary>
22 /// Get the automation elemention of current form.
23 /// </summary>
24 /// <param name="processId">Process Id</param>
25 /// <returns>Target element</returns>
26 public static AutomationElement FindWindowByProcessId(int processId)
27 {
28 AutomationElement targetWindow = null;
29 int count = 0;
30 try
31 {
32 Process p = Process.GetProcessById(processId);
33 targetWindow = AutomationElement.FromHandle(p.MainWindowHandle);
34 return targetWindow;
35 }
36 catch (Exception ex)
37 {
38 count++;
39 StringBuilder sb = new StringBuilder();
40 string message = sb.AppendLine(string.Format("Target window is not existing.try #{0}", count)).ToString();
41 if (count > 5)
42 {
43 throw new InvalidProgramException(message, ex);
44 }
45 else
46 {
47 return FindWindowByProcessId(processId);
48 }
49 }
50 }
51
52
53 /**//// <summary>
54 /// Get the automation element by automation Id.
55 /// </summary>
56 /// <param name="windowName">Window name</param>
57 /// <param name="automationId">Control automation Id</param>
58 /// <returns>Automatin element searched by automation Id</returns>
59 public static AutomationElement FindElementById(int processId, string automationId)
60 {
61 AutomationElement aeForm = FindWindowByProcessId(processId);
62 AutomationElement tarFindElement = aeForm.FindFirst(TreeScope.Descendants,
63 new PropertyCondition(AutomationElement.AutomationIdProperty, automationId));
64 return tarFindElement;
65 }
66
67 SelectItemPattern#region SelectItemPattern
68
69 /**//// <summary>
70 /// Get SelectItemPattern
71 /// </summary>
72 /// <param name="element">AutomationElement instance</param>
73 /// <returns>SelectItemPattern instance</returns>
74 public static SelectionItemPattern GetSelectionItemPattern(AutomationElement element)
75 {
76 object currentPattern;
77 if (!element.TryGetCurrentPattern(SelectionItemPattern.Pattern, out currentPattern))
78 {
79 throw new Exception(string.Format("Element with AutomationId '{0}' and Name '{1}' does not support the SelectionItemPattern.",
80 element.Current.AutomationId, element.Current.Name));
81 }
82 return currentPattern as SelectionItemPattern;
83 }
84
85 #endregion
86 }
87
}
88 以下代码为XAML：
Code
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 <RadioButton Height="16" HorizontalAlignment="Right" Margin="0,46,10,0" Name="radioButton1" VerticalAlignment="Top" Width="120">RadioButton</RadioButton>
7 </Grid>
8</Window>
9
本文简单介绍了SelectionItemPattern以及使用SelectionItemPattern来操作RadioButton。