ValuePattern
ValuePattern是UI Automation中最常见的Pattern之一，Winform和WPF的TextBox控件都支持ValuePattern。
ValuePattern的一个重要的方法是SetValue，在允许调用 SetValue 之前，控件应将其 IsEnabledProperty 设置为 true 并将其 IsReadOnlyProperty 设置为 false。
通过ValuePattern的Current属性可以获得控件的value和IsReadOnly属性。
实现 Value 控件模式时，请注意以下准则和约定：
如果任何项的值是可编辑的，则诸如 ListItem 和 TreeItem 等控件必须支持 ValuePattern，而不管控件的当前编辑模式如何。如果子项是可编辑的，则父控件还必须支持 ValuePattern。
下面的例子是通过ValuePattern来给TextBox设置和获取值：
Code
| 1using 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 AutomationElement element = FindElementById(processId, "textBox1"); 16 ValuePattern currentPattern = GetValuePattern(element); 17 Console.WriteLine("Is read only:'{0}', TextBox text is:'{1}'", currentPattern.Current.IsReadOnly, currentPattern.Current.Value); 18 currentPattern.SetValue("KadenKang"); 19 Console.WriteLine("After using the SetValue, the TextBox value is '{0}'", currentPattern.Current.Value); 20 21 } 22 23 /**//// <summary> 24 /// Get the automation elemention of current form. 25 /// </summary> 26 /// <param name="processId">Process Id</param> 27 /// <returns>Target element</returns> 28 public static AutomationElement FindWindowByProcessId(int processId) 29 { 30 AutomationElement targetWindow = null; 31 int count = 0; 32 try 33 { 34 Process p = Process.GetProcessById(processId); 35 targetWindow = AutomationElement.FromHandle(p.MainWindowHandle); 36 return targetWindow; 37 } 38 catch (Exception ex) 39 { 40 count++; 41 StringBuilder sb = new StringBuilder(); 42 string message = sb.AppendLine(string.Format("Target window is not existing.try #{0}", count)).ToString(); 43 if (count > 5) 44 { 45 throw new InvalidProgramException(message, ex); 46 } 47 else 48 { 49 return FindWindowByProcessId(processId); 50 } 51 } 52 } 53 54 /**//// <summary> 55 /// Get the automation element by automation Id. 56 /// </summary> 57 /// <param name="windowName">Window name</param> 58 /// <param name="automationId">Control automation Id</param> 59 /// <returns>Automatin element searched by automation Id</returns> 60 public static AutomationElement FindElementById(int processId, string automationId) 61 { 62 AutomationElement aeForm = FindWindowByProcessId(processId); 63 AutomationElement tarFindElement = aeForm.FindFirst(TreeScope.Descendants, 64 new PropertyCondition(AutomationElement.AutomationIdProperty, automationId)); 65 return tarFindElement; 66 } 67 68 ValuePattern helper#region ValuePattern helper 69 70 /**//// <summary> 71 /// To get the ValuePattern 72 /// </summary> 73 /// <param name="element">Target element</param> 74 /// <returns>ValuePattern instance</returns> 75 public static ValuePattern GetValuePattern(AutomationElement element) 76 { 77 object currentPattern; 78 if (!element.TryGetCurrentPattern(ValuePattern.Pattern, out currentPattern)) 79 { 80 throw new Exception(string.Format("Element with AutomationId '{0}' and Name '{1}' does not support the ValuePattern.", 81 element.Current.AutomationId, element.Current.Name)); 82 } 83 return currentPattern as ValuePattern; 84 } 85 86 #endregion 87 } 88} 89 |
