Прочетете на английски Редактиране

Споделяне чрез


TextBoxBase.CanUndo Property

Definition

Important

Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.

Gets a value that indicates whether the most recent action can be undone.

C#
public bool CanUndo { get; }

Property Value

true if the most recent action can be undone; otherwise, false.

This property has no default value.

Examples

The following code example demonstrates how to use the CanUndo property to determine whether the most recent action can be undone.

C#
private void undoAction(object sender, RoutedEventArgs e)
{
    if (myTextBox.CanUndo)
    {
        myTextBox.Undo();
    }
}

Applies to

Продукт Версии
.NET Framework 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1
Windows Desktop 3.0, 3.1, 5, 6, 7, 8, 9, 10

See also