递归获取SharePoint文档库文件夹内的所有文件

private DataTable GetFilesData()
        {
            SPList list = GetList();
            DataTable dt = CreateDatatable();
            SPFolder f = null;
            try
            {
                if (string.IsNullOrEmpty(_folderName))
                    f = list.RootFolder;
                else
                    f = list.RootFolder.SubFolders[_folderName];
                if (!string.IsNullOrEmpty(_subFolder))
                    f = f.SubFolders[_subFolder];
                GetAllFiles(f, ref dt, list.ID.ToString("B"));
            }
            catch
            { }
            return dt;
        }

        private void GetAllFiles(SPFolder f, ref DataTable dt, string listId)
        {
            SPListItem item;
            foreach (SPFile file in f.Files)
            {
                item = file.Item;
                DataRow dr = dt.NewRow();
                dr["IconUrl"] = file.IconUrl; //item["DocIcon"];
                string newTag = "";
                if (file.TimeCreated.AddDays(2) > DateTime.Now)
                    newTag = "<img border='0' src='/_layouts/2052/images/new.gif'/>";
                dr["NewTag"] = newTag;
                dr["DocItemID"] = item.ID;
                dr["DocListID"] = listId;
                dr["FileRef"] = item["FileRef"];
                dr["Title"] = item["Title"];
                dr["Author"] = file.Author.Name;
                dr["Created"] = item["Created"];
                dr["Modified"] = item["Modified"];
                dr["Category1"] = item["Category1"];
                dr["Category2"] = item["Category2"];
                dr["SecurityLevel"] = item["SecurityLevel"];
                dr["BaseName"] = item["BaseName"];
                dt.Rows.Add(dr);
            }
            foreach (SPFolder sf in f.SubFolders)
            {
                GetAllFiles(sf, ref dt, listId);
            }
        }