Commands in Document Viewer for WinUI

• Aug 18, 2023

The DocumentViewer.Commands collection contains the Document Viewer commands and allows the user to obtain a command and bind the command to a UI element. All commands implement the ICommand interface. To execute a command, call the command’s Execute method.

The following code invokes the Open dialog when the Document Viewer is loaded:

C#

private void DocumentViewer_Loaded(object sender, RoutedEventArgs e) {
    documentViewer.Commands.ShowOpenDialogCommand.Execute(null);
}

VB.NET

Private Sub DocumentViewer_Loaded(ByVal sender As Object, ByVal e As RoutedEventArgs)
    documentViewer.Commands.ShowOpenDialogCommand.Execute(Nothing)
End Sub

A command’s CanExecute method determines whether the command can be executed.

The following help topic describes how to use commands to create a custom Document Viewer toolbar: Customize the Document Viewer Toolbar in the WinUI Application