Chapter 4 An Architecture to Suit You

return false;

}

backingField = value;

OnPropertyChanged(propertyName);

return true;

}

The SetProperty method does the following:

This concludes the base view model implementation. Let’s proceed to using it as the base for the ClockWidgetViewModel to really appreciate the value it is providing.

Adding ClockWidgetViewModel

Let’s add a new class file into your ViewModels folder as you did for the

BaseViewModel.cs file. Call this file ClockWidgetViewModel and modify the contents to the following:

using System;

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Chapter 4 An Architecture to Suit You

using System.ComponentModel;

namespace WidgetBoard.ViewModels;

public class ClockWidgetViewModel : BaseViewModel, IWidgetViewModel

{

private readonly Scheduler scheduler = new(); private DateTime time;

public DateTime Time

{

get => time;

set => SetProperty(ref time, value);

}

public int Position { get; set; }

public string Type => "Clock";

public ClockWidgetViewModel()

{

SetTime(DateTime.Now);

}

public void SetTime(DateTime dateTime)

{

Time = dateTime;

scheduler.ScheduleAction(

TimeSpan.FromSeconds(1),

() => SetTime(DateTime.Now));

}

}

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