Class to simplify running tasks on the UI thread.

UITask.cs

using System;
using System.Threading.Tasks;
using Windows.ApplicationModel.Core;
using Windows.UI.Core;

namespace TheDevStop.Mobile.Framework
{
    public class UITask
    {
        static readonly CoreDispatcher _dispatcher;

        static UITask()
        {
            _dispatcher = CoreApplication.MainView.CoreWindow.Dispatcher;
        }

        public static Task Run(Action action)
        {
            if (_dispatcher.HasThreadAccess)
            {
                action();
                return Task.FromResult<object>(null);
            }
                
            return _dispatcher.RunAsync(CoreDispatcherPriority.Normal, () => action()).AsTask();
        }

        public static Task Run(Func<Task> func)
        {
            Task result = null;
            Action compute = () => result = func();
            return TaskExtensions.Unwrap(Run(compute).ContinueWith((t) => result));
        }

        public static async Task<T> Run<T>(Func<Task<T>> func)
        {
            Task<T> result = null;
            Action compute = () => result = func();
            await Run(compute);
            return await result;
        }

        public static async Task<T> Run<T>(Func<T> func)
        {
            T result = default(T);
            Action compute = () => result = func();
            await Run(compute);
            return result;
        }
    }
}