Revit二次开辟线根据位置排序

        /// 

        /// 行排序，根据参数2排序
        /// 
        /// 线集合
        /// 排序方向
        /// 
        public static List LineOrderby(List lines, XYZ dir)
        {
            if (lines == null || lines.Count == 0)

                return lines;

            var source = lines.ToDictionary(k => k, v => ((v.GetEndPoint(0) - v.GetEndPoint(1)).DotProduct(dir) > 0 ? v.GetEndPoint(0) : v.GetEndPoint(1)).DotProduct(dir));

            var result = source.OrderBy(r => r.Value).Select(r => r.Key).ToList();
            return result;

        }