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Posted 24 Jul 2008

Using RoutedCommands with a ViewModel in WPF

, 24 Jul 2008
Reviews a clean and lightweight way to use RoutedCommands in the MVVM pattern.
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
using System.Windows.Input;
using VMCommanding.Model;

namespace VMCommanding.ViewModel
    /// <summary>
    /// A ViewModel class that exposes a collection of
    /// PersonViewModel objects, and provides a routed
    /// command that, when executed, kills the people.
    /// This class derives from CommandSink, which is
    /// why it does not directly implement the ICommandSink
    /// interface.  See PersonViewModel for an example
    /// of implementing ICommandSink directly.
    /// </summary>
    public class CommunityViewModel : CommandSink
        #region Constructor

        public CommunityViewModel()
            // Populate the community with some people.
            Person[] people = Person.GetPeople();
            IEnumerable<PersonViewModel> peopleView = people.Select(p => new PersonViewModel(p));
            this.People = new ReadOnlyCollection<PersonViewModel>(peopleView.ToArray());

            // Register the command that kills all the people.
                param => this.CanKillAllMembers,
                param => this.KillAllMembers());

        #endregion // Constructor

        #region People

        public ReadOnlyCollection<PersonViewModel> People { get; private set; }

        #endregion // People

        #region KillAllMembers

        public static readonly RoutedCommand KillAllMembersCommand = new RoutedCommand();

        public bool CanKillAllMembers
            get { return this.People.Any(p => p.CanDie); }

        public void KillAllMembers()
            foreach (PersonViewModel personView in this.People)
                if (personView.CanDie)

        #endregion // KillAllMembers

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About the Author

Josh Smith
Software Developer (Senior) Black Pixel
United States United States
Josh creates software, for iOS and Windows.

He works at Black Pixel as a Senior Developer.

Read his iOS Programming for .NET Developers[^] book to learn how to write iPhone and iPad apps by leveraging your existing .NET skills.

Use his Master WPF[^] app on your iPhone to sharpen your WPF skills on the go.

Check out his Advanced MVVM[^] book.

Visit his WPF blog[^] or stop by his iOS blog[^].

See his website Josh Smith Digital[^].

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