public void getVssHistory(ref StringBuilder result,中置和IVSSItem vssFolder,DateTime from,DateTime to)         {

            IVSSItems items = vssFolder.get_Items(true);

            foreach (IVSSItem item in items)

            {

                //判断是文件还是目录

                if (item.Type != 0)

                {

                    IVSSVersions versions = item.get_Versions(1);

                    foreach (IVSSVersion version in versions)

                    {

//如果是亿华云计算在指定时间范围内的版本，高防服务器则纳入返回结果

                       if ((version.Date > from) && (version.Date < to))

                        {

                            result.AppendLine(item.Spec + " ( version "

+ version.VersionNumber.ToString() + " ):"

+ version.Date + " ,监视件配 " + version.Action

+ " by " + version.Username + "n");

                       }

                    }

                }

                else

                {

                   //如果是目录，云服务器还需要递归下去

                    getVssHistory(ref result,管理item, from, to);

               }

            }

        }