Sysnet.TouchScreen/AppCode/BaseWindow.cs

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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using GalaSoft.MvvmLight.Messaging;

namespace Sysnet.TouchScreen
{
    /// <summary>
    /// A base class for windows that use MVVM
    /// </summary>
    public class BaseWindow : Window
    {
        public BaseWindow()
        {
            // Standard message to close the window
            Messenger.Default.Register<MsgClose>(this, MsgClose_Handler);
        }

        protected override void OnClosed(EventArgs e)
        {
            // Unregister the messages of the window and its view model.
            // This is very important, because the messages live outside their recipient.
            // If you register a message in the constructor of a window and you open the window twice
            // without having unregistered its message, that message will be registered (and handled) twice!
            Messenger.Default.Unregister(this);
            Messenger.Default.Unregister(this.DataContext);

            base.OnClosed(e);
        }


        #region Messages handlers

        void MsgClose_Handler(MsgClose msg)
        {
            this.OnMsgClose(msg);
        }

        #endregion

        protected virtual void OnMsgClose(MsgClose msg)
        {
            // Close the window only if the message comes from the DataContext of this window
            if (msg.SenderViewModel == this.DataContext)
            {
                this.Close();
            }
        }

    }
}