NLog实现归档日志且只保留一段时间的日志（比如一个星期）

最近越来越发现NLog的好，我是用程序的方法来配置， 而不是用XML配置文件。

以下是代码，虽然麻烦了点，但是得到了我想要的功能。

using System;
using System.IO;
using System.Text;
using NLog;
using NLog.Config;
using NLog.Layouts;
using NLog.Targets;

namespace ConsoleApplication1
{
    public class LogHelper
    {
        private static string logPath = string.Empty;

        private static Logger loggerDebug = null;
        private static Logger loggerTrace = null;

        public static void Debug(string log)
        {
            loggerDebug.Debug(log);
        }

        public static void Trace(string log)
        {
            loggerTrace.Trace(log);
        }



        public static bool Ready { get; set; }


        static LogHelper() //静态构造方法，程序加载会执行一次
        {
            LogHelper.Ready = false;

            logPath = Path.Combine(new ConfigHelper().GetDesktopConfigPath(), "Log");
            const string simpleLayout = @"${date:format=HH\:mm\:ss} | ${message} ${newline} | ${stacktrace} | ${newline} ${exception}";
            //const string shortLayout = @"${date:format=HH\:mm\:ss} | ${message}";

            FileTarget fileTargetDebug = new FileTarget
                {
                    Name = "DebugFile",
                    MaxArchiveFiles = 7,
                    ArchiveFileName = logPath + @"/archives/{###}_Debug.txt",
                    ArchiveNumbering = ArchiveNumberingMode.Rolling,
                    ArchiveEvery = FileArchivePeriod.Day,
                    Layout = simpleLayout,
                    AutoFlush = true,
                    DeleteOldFileOnStartup = false,
                    FileName = logPath + @"/Debug.txt",
                    CreateDirs = true,
                };

            FileTarget fileTargetTrace = new FileTarget
            {
                Name = "TraceFile",
                MaxArchiveFiles = 7,
                ArchiveFileName = logPath + @"/{###}_Trace.txt",
                ArchiveNumbering = ArchiveNumberingMode.Rolling,
                ArchiveEvery = FileArchivePeriod.Day,
                Layout = simpleLayout,
                AutoFlush = true,
                DeleteOldFileOnStartup = false,
                FileName = logPath + @"/Trace.txt",
                CreateDirs = true,
            };

            //RichTextBoxTarget richTextBoxTarget = new RichTextBoxTarget();
            //richTextBoxTarget.FormName = "FrmMain";
            //richTextBoxTarget.ControlName = "DisplayBox";
            //richTextBoxTarget.UseDefaultRowColoringRules = true;
            //richTextBoxTarget.Layout = shortLayout;

            LoggingConfiguration loggingConfiguration = new LoggingConfiguration();
            loggingConfiguration.AddTarget("filedebug", fileTargetDebug);
            loggingConfiguration.AddTarget("filetrace",fileTargetTrace);
            //loggingConfiguration.AddTarget("richText", richTextBoxTarget);


            //终于成功，日志只保留一个星期每天自动归档，且有大小限制。
            LoggingRule ruleDebug = new LoggingRule("*", fileTargetDebug);
            ruleDebug.EnableLoggingForLevel(LogLevel.Debug);

            LoggingRule ruleTrace = new LoggingRule("*", fileTargetTrace);
            ruleTrace.EnableLoggingForLevel(LogLevel.Trace);

            loggingConfiguration.LoggingRules.Add(ruleDebug);
            loggingConfiguration.LoggingRules.Add(ruleTrace);

            LogManager.Configuration = loggingConfiguration;
            loggerDebug = LogManager.GetLogger("DebugFile");
            loggerTrace = LogManager.GetLogger("TraceFile");


            LogHelper.Ready = true;

        }

    }
}

该死，由于我用了ConfigHelper来取系统各种特殊目录，因此一起把代码贴出来，希望有所帮助，测试一般用桌面目录，用户日志一般正式发布的时候写到%AppData%下面， %ProgramData%这个目录慎用，一般用户没有写入权限的。

using System;
using System.Globalization;
using System.IO;

namespace ConsoleApplication1
{
    public class ConfigHelper
    {
        private readonly string desktopTemp = Environment.GetFolderPath(Environment.SpecialFolder.Desktop);
        private readonly string programdataTemp = Environment.GetFolderPath(Environment.SpecialFolder.CommonApplicationData);
        private readonly string applicationdataTemp = Environment.GetFolderPath(Environment.SpecialFolder.ApplicationData);

        public string GetFullPath(string basePath)
        {
            string temp = string.Empty;
            temp = basePath + Path.DirectorySeparatorChar.ToString(CultureInfo.InvariantCulture);
            temp += Path.GetFileNameWithoutExtension(System.Windows.Forms.Application.ExecutablePath);
            temp += Path.DirectorySeparatorChar.ToString(CultureInfo.InvariantCulture);
            return temp;
        }

        public string GetDesktopConfigPath()
        {
            return GetFullPath(desktopTemp);
        }

        public string GetAppDataConfigPath()
        {
            return GetFullPath(applicationdataTemp);
        }

        public string GetProgramDataConfigPath()
        {
            return GetFullPath(programdataTemp);
        }

    }
}

下面是调用的代码

  class Program
    {
        static void Main(string[] args)
        {
            while (!LogHelper.Ready) ;

            //Create a thread write log continuously
            ThreadPool.QueueUserWorkItem(new WaitCallback(state =>
                {
                    while (true)
                    {
                        LogHelper.Debug("this is a Test Debug! ");
                        LogHelper.Trace("this is a Test Trace ! ");
                        Thread.Sleep(20);
                    }
                }));
            Console.Read();



        }
    }