将任何旧的WPF几何图形转换为PathFigureCollection？

// 创建一个空的PathFigureCollection对象
PathFigureCollection pathFigures = new PathFigureCollection();

// 假设oldGeometry是旧的WPF几何图形对象
Geometry oldGeometry = ...;

// 遍历旧的几何图形，将其转换为PathFigureCollection
if (oldGeometry is GeometryGroup)
{
    GeometryGroup geometryGroup = (GeometryGroup)oldGeometry;
    foreach (Geometry childGeometry in geometryGroup.Children)
    {
        PathGeometry pathGeometry = childGeometry.GetFlattenedPathGeometry();
        foreach (PathFigure pathFigure in pathGeometry.Figures)
        {
            pathFigures.Add(pathFigure);
        }
    }
}
else if (oldGeometry is PathGeometry)
{
    PathGeometry pathGeometry = (PathGeometry)oldGeometry;
    foreach (PathFigure pathFigure in pathGeometry.Figures)
    {
        pathFigures.Add(pathFigure);
    }
}

// 现在，pathFigures中包含了所有旧的几何图形转换后的PathFigureCollection