CanExecuteRoutedEventArgs.Command Property

Reference

Definition

Namespace:: System.Windows.Input

Assembly:: PresentationCore.dll

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 the command associated with this event.

public:
 property System::Windows::Input::ICommand ^ Command { System::Windows::Input::ICommand ^ get(); };

public System.Windows.Input.ICommand Command { get; }

member this.Command : System.Windows.Input.ICommand

Public ReadOnly Property Command As ICommand

Property Value

ICommand

The command. Unless the command is a custom command, this is generally a RoutedCommand. There is no default value.

Examples

The following example creates a CanExecuteRoutedEventHandler which handles multiple commands. If the Command property is equal to the Play command and the method IsPlaying returns false, CanExecute is set to true; otherwise, CanExecute is set to false. If the Command property is equal to the Stop command and the method IsPlaying returns true, CanExecute is set to true; otherwise, CanExecute is set to false.

private void CanExecuteDisplayCommand(object sender,
    CanExecuteRoutedEventArgs e)
{
    RoutedCommand command = e.Command as RoutedCommand;

    if (command != null)
    {
        if (command == MediaCommands.Play)
        {
            if (!IsPlaying())
            {
                e.CanExecute = true;
            }
            else
            {
                e.CanExecute = false;
            }
        }

        if (command == MediaCommands.Stop)
        {
            if (IsPlaying())
            {
                e.CanExecute = true;
            }
            else
            {
                e.CanExecute = false;
            }
        }
    }
}

Private Sub CanExecuteDisplayCommand(ByVal sender As Object, ByVal e As CanExecuteRoutedEventArgs)
    Dim command As RoutedCommand = TryCast(e.Command, RoutedCommand)

    If command IsNot Nothing Then
        If command Is MediaCommands.Play Then
            If IsPlaying() = False Then
                e.CanExecute = True
            Else
                e.CanExecute = False
            End If
        End If

        If command Is MediaCommands.Stop Then
            If IsPlaying() = True Then
                e.CanExecute = True
            Else
                e.CanExecute = False
            End If
        End If
    End If
End Sub

Remarks

For more information on commanding, see the Commanding Overview.

Applies to

Product	Versions
.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

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