ValuePattern.Pattern 字段

定义

命名空间:

System.Windows.Automation

程序集:

UIAutomationClient.dll

标识 ValuePattern 控件模式。

public: static initonly System::Windows::Automation::AutomationPattern ^ Pattern;

public static readonly System.Windows.Automation.AutomationPattern Pattern;

 staticval mutable Pattern : System.Windows.Automation.AutomationPattern

Public Shared ReadOnly Pattern As AutomationPattern 

字段值

AutomationPattern

示例

在以下示例中 ValuePattern ，从 AutomationElement获取控件模式。

///--------------------------------------------------------------------
/// <summary>
/// Obtains a ValuePattern control pattern from an 
/// automation element.
/// </summary>
/// <param name="targetControl">
/// The automation element of interest.
/// </param>
/// <returns>
/// A ValuePattern object.
/// </returns>
///--------------------------------------------------------------------
private ValuePattern GetValuePattern(
    AutomationElement targetControl)
{
    ValuePattern valuePattern = null;

    try
    {
        valuePattern =
            targetControl.GetCurrentPattern(
            ValuePattern.Pattern)
            as ValuePattern;
    }
    // Object doesn't support the ValuePattern control pattern
    catch (InvalidOperationException)
    {
        return null;
    }

    return valuePattern;
}

'''--------------------------------------------------------------------
''' <summary>
''' Obtains a ValuePattern control pattern from an 
''' automation element.
''' </summary>
''' <param name="targetControl">
''' The automation element of interest.
''' </param>
''' <returns>
''' A ValuePattern object.
''' </returns>
'''--------------------------------------------------------------------
Private Function GetValuePattern( _
ByVal targetControl As AutomationElement) As ValuePattern
    Dim valuePattern As ValuePattern = Nothing

    Try
        valuePattern = DirectCast( _
        targetControl.GetCurrentPattern(valuePattern.Pattern), _
        ValuePattern)
    Catch
        Return Nothing
    End Try

    Return valuePattern

End Function 'GetValuePattern

注解

此标识符由 UI 自动化客户端应用程序使用。 UI 自动化提供程序应使用 中的 ValuePatternIdentifiers等效字段。

模式标识符将传递给等 GetCurrentPattern 方法，以便从指定的 AutomationElement中检索感兴趣的控件模式。

另请参阅

• TextPattern 插入文本示例