WPF ViewModelBase with async support

ViewModelBase.cs

using System;
using System.ComponentModel;
using System.Runtime.CompilerServices;
using System.Threading;
using System.Threading.Tasks;

namespace WPF
{
    public abstract class ViewModelBase : INotifyPropertyChanged
    {
        private readonly SynchronizationContext _context = SynchronizationContext.Current;
        public event PropertyChangedEventHandler PropertyChanged;

        //[NotifyPropertyChangedInvocator] resharper annotation
        protected void OnPropertyChanged([CallerMemberName] string propertyName = null)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }

        protected void DoAsync<TResult>(Func<Task<TResult>> asyncTask, Action<TResult> onUiWithResult)
        {
            Task.Factory.StartNew(async () =>
            {
                TResult data = await asyncTask();
                DoOnUi(() => onUiWithResult(data));
            });
        }

        protected void DoOnUi(Action func)
        {
            _context.Post(o => func(), null);
        }
    }
}