ViewModelBase

gistfile1.txt

// 1
public abstract class ViewModelBase<T> : ReactiveObject, IDisposable where T : ReactiveObject, IDisposable
{  
    // 2
    protected readonly Lazy<CompositeDisposable> ViewModelBindings = new Lazy<CompositeDisposable>(() => new CompositeDisposable());

    // 3
    public bool IsDisposed { get; private set; } 

    bool _bindingsRegistered;

    [DataMember]
    public bool BindingsRegistered
    {
        get { return _bindingsRegistered; }
        protected set { this.RaiseAndSetIfChanged(ref _bindingsRegistered, value); }
    }

    // 4
    protected abstract void RegisterObservables();

    // 5
    protected virtual void Initialize() { } 

    // 6
    protected ViewModelBase()
    {
        Initialize();
        RegisterObservables(); 
    } 

    // 7
    public void RegisterBindings()
    {
        if (!BindingsRegistered)
        {
            RegisterObservables();
            BindingsRegistered = true;
        }
    }

    // 8
    public void UnregisterBindings()
    { 
        if (ViewModelBindings?.IsValueCreated ?? false)
            ViewModelBindings?.Value?.Clear();

        BindingsRegistered = false;
    }

    #region IDisposable implementation

    // 9
    public void Dispose()
    {   
        Dispose(true);
        GC.SuppressFinalize(true); 
    }

    // 10
    protected virtual void Dispose(bool disposing)
    {
        if (disposing && !IsDisposed)
        {
            IsDisposed = true;

            if (ViewModelBindings?.IsValueCreated ?? false)
                ViewModelBindings?.Value?.Dispose();
        }
    }

    #endregion
}