Use XML files to record operation logs

Recording application operation logs can use databases, text files, xml files, etc. What I introduce here is the use of XML files to record operation logs.
I think using XML to record operation logs has the following advantages:
1. It does not occupy database space, and historical operation logs can be deleted arbitrarily.
2. DataTable can easily read XML files, and DataTable can also be easily saved as XML files.
3. It is convenient to view the log. You can directly open the XML file to view it, or you can read it into the DataTable and then view it through the program.

The method of using XML files to record operation logs in VS2005 is as follows:
1. Create a data set: JobLogDataSet.xsd
This includes: TraceLevel (log type), User (user), DateTime (operation Time), Module (module), Function (function), Message (message) 6 fields.
If it’s not enough, add more by yourself, where TraceLevel (log type) refers to Info, Warning, Error, Trance, Off.

2. Create a log type

/// <summary>
    /// 日志类型
    /// </summary>
    public enum LogType 
    { 
        /// <summary>
        /// 信息
        /// </summary>
        Info, 
        /// <summary>
        /// 警告
        /// </summary>
        Warning,
        /// <summary>
        /// 错误
        /// </summary>
        Error, 
        /// <summary>
        /// 跟踪
        /// </summary>
        Trace, 
        /// <summary>
        /// 不记录日志
        /// </summary>
        Off 
    }

2. How to write a log

  /// <summary>
    /// 写日志
    /// </summary>
    /// <param name="traceLevel">日志类型（Info,Warning,Error,Trance,Off）</param>
    /// <param name="user">用户</param>
    /// <param name="module">模块</param>
    /// <param name="function">功能</param>
    /// <param name="message">消息</param>
    public static void WriteLog(LogType logType,string user, string module, string function, string message)
    {
        try
        {
            // 类型为 LogType.Off 的 不记录日志
            if (logType == LogType.Off)
                return;

JobLogDataSet.JobLogDataTable t = new JobLogDataSet .JobLogDataTable();

// 每天一个日志文件(.XML 文件)，日志的文件名称为：JobLog yyyy-MM-dd.xml
            string jobLogFile = AppDomain.CurrentDomain.BaseDirectory + "JobLog " + 
                DateTime.Today.ToString("yyyy-MM-dd") + ".xml";
            if (!File.Exists(jobLogFile))
                t.WriteXml(jobLogFile);

// 从 .XML 文件中读取日志
            t.ReadXml(jobLogFile);

  // 添加一条日志
            JobLogDataSet.JobLogRow r = t.NewJobLogRow();
            r.TraceLevel = logType.ToString();
            r.User = user;
            r.Datetime = DateTime.Now;
            r.Module = module;
            r.Function = function;
            r.Message = message;
            t.AddJobLogRow(r);

           // 保存到日志到 XML 文件
            t.WriteXml(jobLogFile);
        }
        catch (Exception)
        {}
    }

3. How to read the log

  /// <summary>
    /// 读日志
    /// </summary>
    /// <returns>返回读取日志的 DataTable</returns>
    public static JobLogDataSet.JobLogDataTable ReadLog()
    {
        JobLogDataSet.JobLogDataTable jobLogDataTable = new JobLogDataSet.JobLogDataTable();
        try
        {
            // 从应用程序文件夹中，获得所有日志文件 JobLog*.xml
            string[] jobLogFiles = Directory.GetFiles(
                AppDomain.CurrentDomain.BaseDirectory, "JobLog*.xml", SearchOption.TopDirectoryOnly);

// 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. Where you need to write a log, just call the WriteLog method directly.

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