.net动态刷新app.config

你可以刷新 你自己的 你说的方式是:

ConfigurationManager.RefreshSection("yoursection/subsection");

只需将日志记录真/假移到一个部分,您就可以了。

尽管可以将log4net配置设置添加到项目中 app.config 或 web.config FileSystemWatcher 对象,以便在配置文件更改和动态更新其设置时进行监视。

要使用单独的配置文件,请将名为Log4Net.config的文件添加到项目中,并将以下属性添加到AssemblyInfo.cs文件中:

[assembly: log4net.Config.XmlConfigurator(ConfigFile="Log4Net.config", Watch = true)]

注意:对于web应用程序,这假定 Log4Net.config 驻留在web根目录中。确保 log4net.config 文件被标记为复制到输出->总是在属性中复制。

您只需在修改模式下保存配置文件,然后刷新,这将使应用程序从磁盘重新读取该文件。

ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None).Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");

请注意,在WinForms中,您可以在应用程序加载之前(之前)对app.config进行编程更改 Application.Start(new Form1()) ),只要你使用 System.Xml 而不是 System.Configuration.ConfigurationManager

string configFile = Application.ExecutablePath + ".config";  //c:\path\exename.exe.config
XmlDocument xdoc = new XmlDocument();
xdoc.Load(configFile);
XmlNode node = xdoc.SelectSingleNode("/configuration/appSettings/add[@key='nodeToChange']/@value");
node.Value = "new value";
File.WriteAllText(setFile, xdoc.InnerXml);

我编写这个实现是为了在运行时更改日志级别,并将新的treshold持久化回app.config(实际上是Application.exe.config)。

界面:

internal interface ILoggingConfiguration
{
  void SetLogLevel(string level);

  string GetLogLevel();
}

实施:

internal sealed class LoggingConfigurationImpl : ILoggingConfiguration
{
  #region Members

  private static readonly ILog _logger = 
    ObjectManager.Common.Logger.GetLogger();
  private const string DEFAULT_NAME_SPACE = "Default.Name.Space";

  #endregion

  #region Implementation of ILoggingConfiguration

  public void SetLogLevel(string level)
  {
    Level threshold = Log4NetUtils.ConvertToLevel(level);
    ILoggerRepository[] repositories = LogManager.GetAllRepositories();

    foreach (ILoggerRepository repository in repositories)
    {
      try
      {
        SetLogLevelOnRepository(repository, threshold);
      }
      catch (Exception ex)
      {
        _logger.ErrorFormat("Exception while changing log-level: {0}", ex);
      }
    }
    PersistLogLevel(level);
  }

  public string GetLogLevel()
  {
    ILoggerRepository repository = LogManager.GetRepository();
    Hierarchy hierarchy = (Hierarchy) repository;
    ILogger logger = hierarchy.GetLogger(DEFAULT_NAME_SPACE);
    return ((Logger) logger).Level.DisplayName;
  }

  private void SetLogLevelOnRepository(ILoggerRepository repository,
                                       Level threshold)
  {
    repository.Threshold = threshold;
    Hierarchy hierarchy = (Hierarchy)repository;
    ILogger[] loggers = hierarchy.GetCurrentLoggers();
    foreach (ILogger logger in loggers)
    {
      try
      {
        SetLogLevelOnLogger(threshold, logger);
      }
      catch (Exception ex)
      {
        _logger.ErrorFormat("Exception while changing log-level for 
            logger: {0}{1}{2}", logger, Environment.NewLine, ex);
      }
    }
  }

  private void SetLogLevelOnLogger(Level threshold, ILogger logger)
  {
    ((Logger)logger).Level = threshold;
  }

  private void PersistLogLevel(string level)
  {
    XmlDocument config = new XmlDocument();
    config.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);
    string xpath =
      String.Format("configuration/log4net/logger[@name='{0}']/level",
        DEFAULT_NAME_SPACE);
    XmlNode rootLoggerNode = config.SelectSingleNode(xpath);

    try
    {
      rootLoggerNode.Attributes["value"].Value = level;
      config.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

      ConfigurationManager.RefreshSection("log4net");
    }
    catch(Exception ex)
    {
      _logger.ErrorFormat("error while persisting new log-level: {0}", ex);
    }
  }

  #endregion
}

帮助器类Log4NetUtils:

public sealed class Log4NetUtils
{
  private static readonly ILoggerRepository _loggerRepository =
     LoggerManager.GetAllRepositories().First();

  public static Level ConvertToLevel(string level)
  {
    return _loggerRepository.LevelMap[level];
  }
}

XAML代码:

<ComboBox Name="cbxLogLevel" Text="{Binding LogLevel}">
  <ComboBoxItem Content="DEBUG" />
  <ComboBoxItem Content="INFO" />
  <ComboBoxItem Content="WARN" />
  <ComboBoxItem Content="ERROR" />
</ComboBox>
<Button Name="btnChangeLogLevel" 
        Command="{Binding SetLogLevelCommand}"
        CommandParameter="{Binding ElementName=cbxLogLevel, Path=Text}" >
            Change log level
</Button>

我认为没有任何方法可以做到这一点,除非您使用XML编写自己的配置文件读取器。为什么不在应用程序开始时根据配置文件设置打开或关闭日志记录,然后在程序运行时动态打开或关闭它呢?

我想我在log4net文档中读到这是不可能的。

http://logging.apache.org/log4net/release/manual/configuration.html#.config%20Files

无法在运行时重新加载app.config。

我建议使用另一个XML文件,而不是app.config。您甚至可以监视文件的更改,并在更改时自动重新加载它。

实际使用:

Application.restart();

对我来说效果不错。

当做

乔治

我已尝试使用RefreshSection方法,并使用以下代码示例使其正常工作:

class Program
    {
        static void Main(string[] args)
        {
            string value = string.Empty, key = "mySetting";
            Program program = new Program();

            program.GetValue(program, key);
            Console.WriteLine("--------------------------------------------------------------");
            Console.WriteLine("Press any key to exit...");
            Console.ReadLine();
        }

        /// <summary>
        /// Gets the value of the specified key from app.config file.
        /// </summary>
        /// <param name="program">The instance of the program.</param>
        /// <param name="key">The key.</param>
        private void GetValue(Program program, string key)
        {
            string value;
            if (ConfigurationManager.AppSettings.AllKeys.Contains(key))
            {
                Console.WriteLine("--------------------------------------------------------------");
                Console.WriteLine("Key found, evaluating value...");
                value = ConfigurationManager.AppSettings[key];
                Console.WriteLine("Value read from app.confg for Key = {0} is {1}", key, value);
                Console.WriteLine("--------------------------------------------------------------");

                //// Update the value
                program.UpdateAppSettings(key, "newValue");
                //// Re-read from config file
                value = ConfigurationManager.AppSettings[key];
                Console.WriteLine("New Value read from app.confg for Key = {0} is {1}", key, value);
            }
            else
            {
                Console.WriteLine("Specified key not found in app.config");
            }
        }

        /// <summary>
        /// Updates the app settings.
        /// </summary>
        /// <param name="key">The key.</param>
        /// <param name="value">The value.</param>
        public void UpdateAppSettings(string key, string value)
        {
            Configuration configuration = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);

            if (configuration.AppSettings.Settings.AllKeys.Contains(key))
            {
                configuration.AppSettings.Settings[key].Value = value;
            }

            configuration.Save(ConfigurationSaveMode.Modified);
            ConfigurationManager.RefreshSection("appSettings");
        }