autocad.net 图元名柄handle保存为string格式后再转换成objectid的函数

        #region 将handle转换为objectid
        /// <summary>
        /// 将handle转换为objectid
        /// </summary>
        /// <param name="db">database</param>
        /// <param name="handle">handle字符串</param>
        /// <returns>ObjectId</returns>
        public static ObjectId GetObjectId(this Database db, string handle)
        {
            Handle h = new Handle(Int64.Parse(handle, NumberStyles.AllowHexSpecifier));
            ObjectId id = ObjectId.Null;
            db.TryGetObjectId(h, out id);
            return id;
        }
        #endregion