// 把每个日志记录读取到日志 DataTable 中
            foreach (string jobLogFile in jobLogFiles)
            {
                if (File.Exists(jobLogFile))
                {
                    // 读取所有日志文件到临时 DataTable
                    JobLogDataSet.JobLogDataTable t = new JobLogDataSet.JobLogDataTable();
                    t.ReadXml(jobLogFile);
                    // 导入日志记录到主日志 DataTable
                    foreach (JobLogDataSet.JobLogRow r in t)
                        jobLogDataTable.ImportRow(r);
                }
            }
            // 返回读取的日志 DataTable
            return jobLogDataTable;
        }
        catch (Exception)
        {
            return jobLogDataTable;
        }
    }
4. 在需要写日志的地方，直接调用 WriteLog 方法即可。