#342 – Binding a Button to a Command

In WPF, the preferred method for executing some code when a button is clicked is to use a commandA command is an object that represents an action to be taken and is bound to a particular method that performs the action.  The button is then associated with the command by setting its Command property.

Here’s an example.

        <Button Content="Open" Command="ApplicationCommands.Open" />

ApplicationCommands.Open is a predefined command that is just a placeholder that you bind to some “open” logic in your application.  You do this by adding a new CommandBinding object to the parent window’s CommandBindings collection.

You specify handlers for the Executed and CanExecute events of the command.

		public MainWindow()
		{
			this.InitializeComponent();

            CommandBindings.Add(new CommandBinding(ApplicationCommands.Open, Open_Executed, Open_CanExecute));
        }

        public void Open_Executed(object sender, ExecutedRoutedEventArgs e)
        {
            // Open file here
        }

        public void Open_CanExecute(object sender, CanExecuteRoutedEventArgs e)
        {
            e.CanExecute = true;   // Can we open file?
        }

About Sean
Software developer in the Twin Cities area, passionate about .NET technologies. Equally passionate about my own personal projects related to family history and preservation of family stories and photos.

3 Responses to #342 – Binding a Button to a Command

  1. Pingback: #1,078 – Defining a Command Binding Using Lambda Expressions | 2,000 Things You Should Know About WPF

  2. Pingback: #1,079 – Executing a Command Programmatically | 2,000 Things You Should Know About WPF

  3. Pingback: #1,085 – Input Bindings Don’t Require that Element Binds to Command | 2,000 Things You Should Know About WPF

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: