AutomationElement.TryGetCurrentPattern(AutomationPattern, Object) 方法

定義

命名空間:
System.Windows.Automation
組件:
UIAutomationClient.dll
組件:

擷取實作控制項模式的物件。Retrieves an object that implements a control pattern.

public:
 bool TryGetCurrentPattern(System::Windows::Automation::AutomationPattern ^ pattern, [Runtime::InteropServices::Out] System::Object ^ % patternObject);
public bool TryGetCurrentPattern (System.Windows.Automation.AutomationPattern pattern, out object patternObject);
member this.TryGetCurrentPattern : System.Windows.Automation.AutomationPattern * obj -> bool
Public Function TryGetCurrentPattern (pattern As AutomationPattern, ByRef patternObject As Object) As Boolean

參數

pattern
AutomationPattern

要擷取之控制項模式的識別項。The identifier of the control pattern to retrieve.

patternObject
Object

傳回時，如果支援則為控制項模式；否則為 null。On return, the control pattern if it is supported; otherwise null.

傳回

Boolean

true 表示支援該模式；否則為 false。true if the pattern is supported; otherwise false.

範例

下列範例顯示如何使用這個方法來抓取控制項模式。The following example shows how to use this method to retrieve a control pattern.

// element is an AutomationElement.
object objPattern;
SelectionPattern selPattern;
if (true == element.TryGetCurrentPattern(SelectionPattern.Pattern, out objPattern))
{
    selPattern = objPattern as SelectionPattern;
}

' element is an AutomationElement.
Dim objPattern As Object = Nothing
Dim selPattern As SelectionPattern
If True = element.TryGetCurrentPattern(SelectionPattern.Pattern, objPattern) Then
    selPattern = DirectCast(objPattern, SelectionPattern)
End If

備註

針對某些形式的使用者介面 (UI) ，這個方法會產生跨進程的效能額外負荷。For some forms of user interface (UI), this method will incur cross-process performance overhead. 應用程式可以藉由快取模式，然後使用來加以抓取，藉以專注額外負荷 GetCachedPattern 。Applications can concentrate overhead by caching patterns and then retrieving them by using GetCachedPattern.

適用於

另請參閱