Επεξεργασία

Κοινή χρήση μέσω

ValuePattern.ValueProperty Field

  • Reference

Definition

Namespace:
System.Windows.Automation
Assembly:
UIAutomationClient.dll

Identifies the Value property.

public: static initonly System::Windows::Automation::AutomationProperty ^ ValueProperty;
public static readonly System.Windows.Automation.AutomationProperty ValueProperty;
 staticval mutable ValueProperty : System.Windows.Automation.AutomationProperty
Public Shared ReadOnly ValueProperty As AutomationProperty

Field Value

AutomationProperty

Examples

In the following example, a ValuePattern object obtained from a target control is passed into a function that retrieves the current ValuePattern property values.

///--------------------------------------------------------------------
/// <summary>
/// Gets the current property values from target.
/// </summary>
/// <param name="valuePattern">
/// A ValuePattern control pattern obtained from 
/// an automation element representing a target control.
/// </param>
/// <param name="automationProperty">
/// The automation property of interest.
/// </param>
///--------------------------------------------------------------------
private object GetValueProperty(
    ValuePattern valuePattern,
    AutomationProperty automationProperty)
{
    if (valuePattern == null || automationProperty == null)
    {
        throw new ArgumentNullException("Argument cannot be null.");
    }

    if (automationProperty.Id ==
        ValuePattern.ValueProperty.Id)
    {
        return valuePattern.Current.Value;
    }
    return null;
}

'''--------------------------------------------------------------------
''' <summary>
''' Gets the current property values from target.
''' </summary>
''' <param name="valuePattern">
''' A ValuePattern control pattern obtained from 
''' an automation element representing a target control.
''' </param>
''' <param name="automationProperty">
''' The automation property of interest.
''' </param>
'''--------------------------------------------------------------------
Private Function GetValueProperty( _
ByVal valuePattern As ValuePattern, _
ByVal automationProperty As AutomationProperty) As Object
    If (valuePattern Is Nothing Or automationProperty Is Nothing) Then
        Throw New ArgumentNullException("Argument cannot be null.")
    End If

    If automationProperty.Id = valuePattern.ValueProperty.Id Then
        Return valuePattern.Current.Value
    End If
    Return Nothing

End Function 'GetValueProperty

Remarks

This identifier is used by UI Automation client applications. UI Automation providers should use the equivalent field in ValuePatternIdentifiers.

Applies to

See also