拼接JSON数据

//根据记录表IDRecordID查找所有文件
                IList<Model.FILECHANGE_FILE> listFile = cFile.GetList(" where t.RecordID", "");
                if (listFile.Count > 0)
                {
                    //返回JSON数据
                    _strResult.Append("[");
                    foreach (var files in listFile)
                    {
                        _strResult.Append("{");
                        _strResult.Append("filename");
                        _strResult.Append("\"FILENAME\":\"" + files.FILENAME + "\",\"FILETYPE\":\"" + files.FILETYPE + "\",\"FILESIZE\":\"" + files.FILESIZE + "\",\"FILE\":\"" + "");
                        _strResult.Append("},");
                    }
                    if (listFile.Count > 0)
                    {
                        _strResult = _strResult.Remove(_strResult.ToString().LastIndexOf(‘,‘), 1);
                    }
                    _strResult.Append("]");
                }