FileInfo和DirectoryInfo

        if (TargetFileInfo.FullName.Contains("\\"))
        {
          directory = TargetFileInfo.Directory.FullName.Replace("\\", "");
          isServerFolder = true;
        }

TargetFileInfo.FullName：包含文件名与后缀

TargetFileInfo.Directory.FullName：仅包含完整路径

TargetFileInfo.Directory.Name：仅为最后一级路径名