WPF在运行时更改矩形点

我有一个WPF应用程序，我需要在运行时对其进行编程操作

我想做的是创建一条包含4条线段的路径，如下所示：

但问题是，当我更改左上方的线段时，“似乎”会在线段列表中添加一个点，即最后两个点（左下方和左上方）不再合并

我知道我错过了一些小的东西，但是请，任何帮助都将不胜感激

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谢谢，Mark

没关系，我想出来了，我只需要在PathFigure上设置起始点，并将该点与线段一起更改（考虑到我添加了起始点，我删除了第一个线段）

谢谢

          Canvas.Left="324" 
          Canvas.Top="247">
        <Path.Data>
            <PathGeometry>
                <PathFigure IsClosed="True">
                    <LineSegment Point="0.5,0.5" />
                    <LineSegment Point="355.5,0.5" />
                    <LineSegment Point="355.5,229.5" />
                    <LineSegment Point="0.5,229.5" />
                </PathFigure>
            </PathGeometry>
        </Path.Data>
    </Path>

        PathFigureCollection figures = (ThePath.Data as PathGeometry).Figures;

        Console.WriteLine("number of segments: " + figures[0].Segments.Count);

        LineSegment topLeft = figures[0].Segments[0] as LineSegment;
        LineSegment topRight = figures[0].Segments[1] as LineSegment;
        LineSegment bottomRight = figures[0].Segments[2] as LineSegment;
        LineSegment bottomLeft = figures[0].Segments[3] as LineSegment;

        topLeft.Point = new Point(topLeft.Point.X - 5, topLeft.Point.Y - 5);
        topRight.Point = new Point(topRight.Point.X + 45, topRight.Point.Y - 35);
        bottomRight.Point = new Point(bottomRight.Point.X, bottomRight.Point.Y + 35);
        bottomLeft.Point = new Point(bottomLeft.Point.X + 5, bottomLeft.Point.Y - 15);