关于不启动revit获取版本号

  public static class RevitFileUtils
  {
    
    
        private const string MatchVersion = @"((?<=Autodesk Revit )20\d{2})|((?<=Format: )20\d{2})";
        /// <summary>
        /// 获取revit文件版本号[采用流方式]返回结果（eg:2018,2019）
        /// </summary>
        /// <param name="filePath"></param>
        /// <returns>返回结果（eg:2018,2019）</returns>
        public static string GetVersion(string filePath)
        {
    
    
            var version = string.Empty;
            Encoding useEncoding = Encoding.Unicode;
            using (FileStream file = new FileStream(filePath, FileMode.Open))
            {
    
    
                //匹配字符有20个(最长的匹配字符串18版本的有20个)，为了防止分割对匹配造成的影响，需要验证20次偏移结果
                for (int i = 0; i < 20; i++)
                {
    
    
                    byte[] buffer = new byte[2000];
                    file.Seek(i, SeekOrigin.Begin);
                    while (file.Read(buffer, 0, buffer.Length) != 0)
                    {
    
    
                        var head = useEncoding.GetString(buffer);
                        Regex regex = new Regex(MatchVersion);
                        var match = regex.Match(head);
                        if (match.Success)
                        {
    
    
                            version = match.ToString();
                            return version;
                        }
                    }
                }
            }
            return version;
        }
    }

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