如何在Universal Windows Platform (UWP)应用程序中通过鼠标单击来移动文本框

<TextBox x:Name="myTextBox" Width="200" Height="30" Text="Hello World!" />

myTextBox.PointerPressed += MyTextBox_PointerPressed;
myTextBox.PointerMoved += MyTextBox_PointerMoved;

private void MyTextBox_PointerPressed(object sender, PointerRoutedEventArgs e)
{
    var textBox = (TextBox)sender;
    textBox.CapturePointer(e.Pointer);
    startPoint = e.GetCurrentPoint(null).Position;
}

private void MyTextBox_PointerMoved(object sender, PointerRoutedEventArgs e)
{
    var textBox = (TextBox)sender;
    if (textBox.PointerCaptures != null && textBox.PointerCaptures.Contains(e.Pointer))
    {
        var currentPoint = e.GetCurrentPoint(null).Position;
        var distanceX = currentPoint.X - startPoint.X;
        var distanceY = currentPoint.Y - startPoint.Y;
        Canvas.SetLeft(textBox, Canvas.GetLeft(textBox) + distanceX);
        Canvas.SetTop(textBox, Canvas.GetTop(textBox) + distanceY);
        startPoint = currentPoint;
    }
}