asynchelper在一个同步方法（非async）方法中等待async方法

    /// <summary>
    /// 异步调用助手类
    /// </summary>
    /// <see cref="http://www.tuicool.com/articles/QF73qaA"/>
    public static class AsyncHelper
    {
        public static void InvokeAndWait(Func<Task> asyncMethod)
        {
            // ReSharper disable once ConvertClosureToMethodGroup
            Task.Run(() => asyncMethod())
                .ContinueWith(t => t.Wait())
                .Wait();
        }

        public static T InvokeAndWait<T>(Func<Task<T>> asyncMethod)
        {
            var result = default(T);
            // ReSharper disable once ConvertClosureToMethodGroup
            Task.Run<T>(() => asyncMethod())
                .ContinueWith(t =>
                {
                    t.Wait();
                    result = t.Result;
                }).Wait();
            return result;
        }
    }

    /// <summary>
    /// 异步调用助手类
    /// https://github.com/aspnet/AspNetIdentity.git
    /// </summary>
    public static class TaskAsyncHelper
    {
        private static readonly TaskFactory _myTaskFactory = new TaskFactory(CancellationToken.None,
            TaskCreationOptions.None, TaskContinuationOptions.None, TaskScheduler.Default);
        /// <summary>
        /// demo: return TaskAsyncHelper.RunSync(() => manager.UpdateAsync(role));
        /// </summary>
        /// <typeparam name="TResult"></typeparam>
        /// <param name="func"></param>
        /// <returns></returns>
        public static TResult RunSync<TResult>(Func<Task<TResult>> func)
        {
            var cultureUi = CultureInfo.CurrentUICulture;
            var culture = CultureInfo.CurrentCulture;
            return _myTaskFactory.StartNew(() =>
            {
                Thread.CurrentThread.CurrentCulture = culture;
                Thread.CurrentThread.CurrentUICulture = cultureUi;
                return func();
            }).Unwrap().GetAwaiter().GetResult();
        }

        /// <summary>
        /// demo: TaskAsyncHelper.RunSync(() => manager.SendEmailAsync(userId, subject, body));
        /// </summary>
        /// <param name="func"></param>
        public static void RunSync(Func<Task> func)
        {
            var cultureUi = CultureInfo.CurrentUICulture;
            var culture = CultureInfo.CurrentCulture;
            _myTaskFactory.StartNew(() =>
            {
                Thread.CurrentThread.CurrentCulture = culture;
                Thread.CurrentThread.CurrentUICulture = cultureUi;
                return func();
            }).Unwrap().GetAwaiter().GetResult();
        }
    }