@hivesbee 誕生日おめでとう

DragAndDropSample.cs

public partial class MainWindow : Window
{
    /// <summary>
    /// D&D の軌跡のコレクションのコレクション。
    /// </summary>
    private readonly List<List<Point>> points = new List<List<Point>>();

    public MainWindow()
    {
        InitializeComponent();

        Observable.FromEventPattern<MouseEventHandler, MouseEventArgs>(
                h => this.MouseMove += h,
                h => this.MouseMove -= h)
            .SkipUntil(Observable
                .FromEventPattern<MouseButtonEventHandler, MouseButtonEventArgs>(
                    h => this.MouseDown += h,
                    h => this.MouseDown -= h)
                .Do(_ => this.CaptureMouse()))
            .TakeUntil(Observable
                .FromEventPattern<MouseButtonEventHandler, MouseButtonEventArgs>(
                    h => this.MouseUp += h,
                    h => this.MouseUp -= h)
                .Do(_ => this.ReleaseMouseCapture()))
            .Select(x => x.EventArgs.GetPosition(null))
            .Do(x => this.TextBlock.Text = string.Format("X: {0}, Y:{1}", x.X, x.Y))
            .Aggregate(new List<Point>(), (l, x) => { l.Add(x); return l; })
            .Finally(() => this.TextBlock.Text = "Completed")
            .Repeat()
            .Subscribe(x => this.points.Add(x));
    }
}