AutomationElement.Cached Properti
Definisi
Penting
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Mendapatkan nilai properti Automation UI yang di-cache untuk objek ini AutomationElement .
public:
property System::Windows::Automation::AutomationElement::AutomationElementInformation Cached { System::Windows::Automation::AutomationElement::AutomationElementInformation get(); };public System.Windows.Automation.AutomationElement.AutomationElementInformation Cached { get; }member this.Cached : System.Windows.Automation.AutomationElement.AutomationElementInformationPublic ReadOnly Property Cached As AutomationElement.AutomationElementInformationNilai Properti
Struktur yang berisi nilai properti yang di-cache untuk AutomationElement.
Pengecualian
Tidak ada properti yang di-cache.
UI untuk AutomationElement tidak ada lagi.
Contoh
Contoh berikut menunjukkan bagaimana Name properti dapat di-cache lalu diambil dengan menggunakan Cached properti .
/// <summary>
/// Gets a list box element and caches the Name property of its children (the list items).
/// </summary>
/// <param name="elementMain">The UI Automation element for the parent window.</param>
void CachePropertiesWithScope(AutomationElement elementMain)
{
AutomationElement elementList;
// Set up the CacheRequest.
CacheRequest cacheRequest = new CacheRequest();
cacheRequest.Add(AutomationElement.NameProperty);
cacheRequest.TreeScope = TreeScope.Element | TreeScope.Children;
// Activate the CacheRequest and get the element. Note that the scope of the CacheRequest
// is in relation to the object being retrieved: the list box and its children are
// cached, not the main window and its children.
using (cacheRequest.Activate())
{
// Load the list element and cache the specified properties for its descendants.
Condition cond = new PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List);
elementList = elementMain.FindFirst(TreeScope.Children, cond);
}
if (elementList == null) return;
// The following illustrates that the children of the list are in the cache.
foreach (AutomationElement listItem in elementList.CachedChildren)
{
Console.WriteLine(listItem.Cached.Name);
}
// The following call raises an exception, because the IsEnabled property was not cached.
/*** Console.WriteLine(listItem.Cached.IsEnabled); ***/
// The following illustrates that because the list box itself was cached, it is now
// available as the CachedParent of each list item.
AutomationElement child = elementList.CachedChildren[0];
Console.WriteLine(child.CachedParent.Cached.Name);
}
''' <summary>
''' Gets a list box element and caches the Name property of its children (the list items).
''' </summary>
''' <param name="elementMain">The UI Automation element for the parent window.</param>
Sub CachePropertiesWithScope(ByVal elementMain As AutomationElement)
Dim elementList As AutomationElement
' Set up the CacheRequest.
Dim cacheRequest As New CacheRequest()
cacheRequest.Add(AutomationElement.NameProperty)
cacheRequest.TreeScope = TreeScope.Element Or TreeScope.Children
' Activate the CacheRequest and get the element. Note that the scope of the CacheRequest
' is in relation to the object being retrieved: the list box and its children are
' cached, not the main window and its children.
Using cacheRequest.Activate()
' Load the list element and cache the specified properties for its descendants.
Dim myCondition As New PropertyCondition(AutomationElement.ControlTypeProperty, ControlType.List)
elementList = elementMain.FindFirst(TreeScope.Children, myCondition)
If elementList Is Nothing Then
Return
End If
' The following illustrates that the children of the list are in the cache.
Dim listItem As AutomationElement
For Each listItem In elementList.CachedChildren
Console.WriteLine(listItem.Cached.Name)
Next listItem
' The following call raises an exception, because the IsEnabled property was not cached.
'** Console.WriteLine(listItem.Cached.IsEnabled) **
' The following illustrates that because the list box itself was cached, it is now
' available as the CachedParent of each list item.
Dim child As AutomationElement = elementList.CachedChildren(0)
Console.WriteLine(child.CachedParent.Cached.Name)
End Using
End Sub
Keterangan
Aksesor untuk properti Automation UI diwakili sebagai properti struktur yang dikembalikan oleh Cached. Anda tidak perlu mengambil struktur; Anda dapat mengakses anggotanya secara langsung, seperti pada contoh di bawah ini. Untuk informasi spesifik tentang properti yang tersedia dan penggunaannya, lihat AutomationElement.AutomationElementInformation.
Untuk mendapatkan nilai properti Automation UI saat ini pada elemen ini, gunakan Current properti .
