ValuePattern.ValuePatternInformation.IsReadOnly ValuePattern.ValuePatternInformation.IsReadOnly ValuePattern.ValuePatternInformation.IsReadOnly ValuePattern.ValuePatternInformation.IsReadOnly Property

定義

取得值,指定 UI 自動化UI Automation 項目的值是否為唯讀。Gets a value that specifies whether the value of a UI 自動化UI Automation element is read-only.

public:
 property bool IsReadOnly { bool get(); };
public bool IsReadOnly { get; }
member this.IsReadOnly : bool
Public ReadOnly Property IsReadOnly As Boolean

屬性值

如果此值為唯讀,則為 true;如果可以修改,則為 falsetrue if the value is read-only; false if it can be modified.

範例

在下列範例中, AutomationElement ValuePattern支援控制項模式的會將其ValueProperty設定為使用者指定的值。In the following example, an AutomationElement that supports the ValuePattern control pattern has its ValueProperty set to a user-specified value.

///--------------------------------------------------------------------
/// <summary>
/// Inserts a string into a text control that supports ValuePattern.
/// </summary>
/// <param name="targetControl">A text control.</param>
/// <param name="value">The string to be inserted.</param>
///--------------------------------------------------------------------
private void InsertText(AutomationElement targetControl,
                                    string value)
{
    // Validate arguments / initial setup
    if (value == null)
        throw new ArgumentNullException(
            "String parameter must not be null.");

    if (targetControl == null)
        throw new ArgumentNullException(
            "AutomationElement parameter must not be null");

    // A series of basic checks prior to attempting an insertion.
    //
    // Check #1: Is control enabled?
    // An alternative to testing for static or read-only controls 
    // is to filter using 
    // PropertyCondition(AutomationElement.IsEnabledProperty, true) 
    // and exclude all read-only text controls from the collection.
    if (!targetControl.Current.IsEnabled)
    {
        throw new InvalidOperationException(
            "The control is not enabled.\n\n");
    }

    // Check #2: Are there styles that prohibit us 
    //           from sending text to this control?
    if (!targetControl.Current.IsKeyboardFocusable)
    {
        throw new InvalidOperationException(
            "The control is not focusable.\n\n");
    }

    // Once you have an instance of an AutomationElement,  
    // check if it supports the ValuePattern pattern.
    object valuePattern = null;

    if (!targetControl.TryGetCurrentPattern(
        ValuePattern.Pattern, out valuePattern))
    {
        // Elements that support TextPattern 
        // do not support ValuePattern and TextPattern
        // does not support setting the text of 
        // multi-line edit or document controls.
        // For this reason, text input must be simulated.
    }
    // Control supports the ValuePattern pattern so we can 
    // use the SetValue method to insert content.
    else
    {
        if (((ValuePattern)valuePattern).Current.IsReadOnly)
        {
            throw new InvalidOperationException(
                "The control is read-only.");
        }
        else
        {
            ((ValuePattern)valuePattern).SetValue(value);
        }
    }
}
'''--------------------------------------------------------------------
''' <summary>
''' Inserts a string into a text control that supports ValuePattern.
''' </summary>
''' <param name="targetControl">A text control.</param>
''' <param name="value">The string to be inserted.</param>
'''--------------------------------------------------------------------
Private Sub InsertText(ByVal targetControl As AutomationElement, _
ByVal value As String)
    ' Validate arguments / initial setup
    If value Is Nothing Then
        Throw New ArgumentNullException( _
        "String parameter must not be null.")
    End If

    If targetControl Is Nothing Then
        Throw New ArgumentNullException( _
        "AutomationElement parameter must not be null")
    End If

    ' A series of basic checks prior to attempting an insertion.
    '
    ' Check #1: Is control enabled?
    ' An alternative to testing for static or read-only controls 
    ' is to filter using 
    ' PropertyCondition(AutomationElement.IsEnabledProperty, true) 
    ' and exclude all read-only text controls from the collection.
    If Not targetControl.Current.IsEnabled Then
        Throw New InvalidOperationException( _
        "The control is not enabled." + vbLf + vbLf)
    End If

    ' Check #2: Are there styles that prohibit us 
    '           from sending text to this control?
    If Not targetControl.Current.IsKeyboardFocusable Then
        Throw New InvalidOperationException( _
        "The control is not focusable." + vbLf + vbLf)
    End If

    ' Once you have an instance of an AutomationElement,  
    ' check if it supports the ValuePattern pattern.
    Dim valuePattern As Object = Nothing

    If Not targetControl.TryGetCurrentPattern( _
    valuePattern.Pattern, valuePattern) Then
        ' Elements that support TextPattern 
        ' do not support ValuePattern and TextPattern
        ' does not support setting the text of 
        ' multi-line edit or document controls.
        ' For this reason, text input must be simulated.
        ' Control supports the ValuePattern pattern so we can 
        ' use the SetValue method to insert content.
    Else
        If CType(valuePattern, ValuePattern).Current.IsReadOnly Then
            Throw New InvalidOperationException("The control is read-only.")
        Else
            CType(valuePattern, ValuePattern).SetValue(value)
        End If
    End If

End Sub

備註

在用戶端嘗試呼叫IsEnabledProperty之前, true控制項應IsReadOnlyProperty將其false設定為, 並將其設定SetValue為。A control should have its IsEnabledProperty set to true and its IsReadOnlyProperty set to false before the client attempts a call to SetValue.

適用於

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