private async Task showChildAsync()
        {
            var dispatcherQueue = Windows.System.DispatcherQueue.GetForCurrentThread();
            var dialog          = new TaskDialog();
            var result          = await dialog.ShowAsync();

            if (result != ContentDialogResult.Primary)
            {
                return;
            }
            if (!dialog.CheckForm())
            {
                return;
            }
            var item = dialog.FormData();

            item.ParentId = id;
            var data = await App.Repository.Task.SaveTaskAsync(item);

            if (data == null)
            {
                return;
            }
            await dispatcherQueue.EnqueueAsync(() =>
            {
                Toast.Tip("添加成功");
            });
        }
        private async Task FastCreateAsync()
        {
            var dispatcherQueue = Windows.System.DispatcherQueue.GetForCurrentThread();
            var dialog          = new TaskDialog();

            dialog.Title = "快捷创建任务";
            var result = await dialog.ShowAsync();

            if (result != ContentDialogResult.Primary)
            {
                return;
            }
            if (!dialog.CheckForm())
            {
                return;
            }
            var data = await App.Repository.Task.FastCreateAsync(dialog.FormData());

            if (data == null)
            {
                return;
            }
            await dispatcherQueue.EnqueueAsync(() =>
            {
                Toast.Tip("添加成功");
                ViewModel.Items.Add(data);
            });
        }