Model-View-ViewModel (MVVM) Explained

using System;
using System.Linq;
using System.Windows.Threading;

namespace MVVMExample
{
    public class Service : IService 
    {
        public void GetContacts(Action<IQueryable<ContactModel>> callback)
        {
            var timer = new DispatcherTimer();
            timer.Interval = TimeSpan.FromMilliseconds(1000);
            timer.Tick += (o, e) =>
                              {
                                  ((DispatcherTimer) o).Stop();
                                  callback(ContactDb.GetContacts());
                              };
            timer.Start();
        }

        public void DeleteContact(ContactModel contact)
        {
            ContactDb.Delete(contact);            
        }
    }
}

Note: articles posted here are independently written and do not represent endorsements nor reflect the views of my employer.

I am a Program Manager for .NET Data at Microsoft. I have been building enterprise software with a focus on line of business web applications for more than two decades. I'm the author of several (now historical) technical books including Designing Silverlight Business Applications and Programming the Windows Runtime by Example. I use the Silverlight book everyday! It props up my monitor to the correct ergonomic height. I have delivered hundreds of technical presentations in dozens of countries around the world and love mentoring other developers. I am co-host of the Microsoft Channel 9 "On .NET" show. In my free time, I maintain a 95% plant-based diet, exercise regularly, hike in the Cascades and thrash Beat Saber levels.

I was diagnosed with young onset Parkinson's Disease in February of 2020. I maintain a blog about my personal journey with the disease at https://strengthwithparkinsons.com/.