c# - Nito AsyncEx/AsyncInLine を使用して async filePicker でリードする

Question

私は async world の初心者で、Windows ストア アプリ用の開発を始めました。私の問題は、ファイルピッカーの非同期メソッドが終了して他のことをするのを待つ必要があることです。

そこで、「同期および非同期メソッド c# を実行する」を検索して、Stephen Cleary ブログで終了しました。Nito AsyncEx を使用して問題を解決しようとしましたが、次のメソッドを呼び出しても停止しないため、機能しません。

private List<Templates> classModel = new List<Templates>();
private void btnLoadClassExercises_Click(object sender, RoutedEventArgs e)
{
   AsyncContext.Run(() => loadFile());
   // do some stuff with classModel
}

private async void loadFile()
{
   FileOpenPicker openPicker = new FileOpenPicker();
   openPicker.FileTypeFilter.Add(".xml");
   var file = await openPicker.PickSingleFileAsync();
   classModel = xml.getControlClass(file);
 }

検索中に、このような他のものを手伝ってくれる AsyncInLine というクラスを見つけました。しかし、この特定の状況では、私もうまくいきませんでした。( http://social.msdn.microsoft.com/Forums/en-US/async/thread/163ef755-ff7b-4ea5-b226-bbe8ef5f4796 )

誰かが私を助けることができますか？

編集＃1：

    //When i click on this button, it loads the file and all canvas are drawn on canvasSegment.
    private async void btnLoadClassExercises_Click(object sender, RoutedEventArgs e)
    {
        try
        {
            if (classModel != null)
            {
                FileOpenPicker openPicker = new FileOpenPicker();
                openPicker.FileTypeFilter.Add(".xml");
                var file = await openPicker.PickSingleFileAsync();
                classModel = xml.getControlClass(file);

                auxCV = 0;
                if (editClass)
                    CanvasSegment.Children.Clear();
                foreach (Templates temp in classModel)
                    createCanvasSegment(temp);
                editClass = true;
            }
        }
        catch { }
    }

    // When i want to del some canvas, i put the removeCV = true and click on a canvas
    private void btnDelExercise_Click(object sender, RoutedEventArgs e)
    {
        classEdit = classModel; //To debuf if the classModel.Count = 0
        removeCV = true;
    }

    //When i click on a canvas, if removeCV = false, i draw the canvas on the main canvas(canvasClass), otherwise, i delete it. The problem is here. My modelClass.count here is = 0.  
    private void cv_PointerPressed(Templates temp, Canvas cv)
    {
        if (!removeCV)
        {
            foreach (StackPanel sp in CanvasSegment.Children)
                foreach (Canvas c in sp.Children)
                    c.Opacity = 1;

            cv.Opacity = 0.8;
            canvasClass.Children.Clear();

            for (int i = 0; i < temp.Shapes.Count; i++)
            {
                //Do some stuff with points and draws on CanvasClass later
                rh.renderModel(new InkManager(), canvasClass, temp.Shapes[i], true, false);
            }
        }
        else
        {
            for (int i = 0; i <= classModel.Count; i++)
                if (classModel[i] == temp)
                {
                    classModel.RemoveAt(i);
                    break;
                }

            CanvasSegment.Children.Clear();
            auxCV = 0;
            foreach (Templates tempModel in classModel)
                createCanvasSegment(tempModel);
            removeCV = false;
        }
    }

    //I create a mini canvas foreach template in file.
    private void createCanvasSegment(Templates temp)
    {
        Thickness thk = new Thickness();
        thk.Right = 5;
        thk.Bottom = 5;
        if (temp != null || temp.Shapes != null)
        {
            if (auxCV == 0)
            {
                spcv = new StackPanel();
                spcv.Orientation = Orientation.Horizontal;
                spcv.Width = 540;
            }
            Canvas cv = new Canvas()
            {
                Background = new SolidColorBrush(Colors.Wheat),
                Name = temp.Template,
                Height = 73.125,
                Width = 130,
                Margin = thk,
            };

            cv.PointerPressed += (s, e) => cv_PointerPressed(temp, cv);
            foreach (ShapePoints tempshapePoints in temp.Shapes)
            {
                ShapePoints tempS = tempShapePoints;
                if (!removeCV)
                {
                    //Do some stuff with points
                }
                rh.renderModel(new InkManager(), cv, tempS, true, false);
            }

            auxCV++;
                spcv.Children.Add(cv);
            if (auxCV == 1)
                CanvasSegment.Children.Add(spcv);
            else if (auxCV == 4)
                auxCV = 0;
        }
    }