从字符串创建强类型的log4net级别

Question

我注意到log4net有一个强类型的Level类.有没有人知道是否有办法通过解析日志级别字符串来创建一个Level对象？

例如:

我想将错误级别字符串"ERROR"解析为等效的log4net.Core.Level.Error对象,对于其他日志记录级别也是如此.

我写了自己的(天真)方法来做到这一点(见下文),但我希望log4net内部有一些东西能为我做这件事.

谢谢!

    public static Level ParseLevel(string level)
    {
        switch (level.ToUpperInvariant())
        {
            case "ALERT":
                return log4net.Core.Level.Alert;
            case "ALL":
                return log4net.Core.Level.All;
            case "CRITICAL":
                return log4net.Core.Level.Critical;
            case "DEBUG":
                return log4net.Core.Level.Debug;
            case "EMERGENCY":
                return log4net.Core.Level.Emergency;
            case "ERROR":
                return log4net.Core.Level.Error;
            case "FATAL":
                return log4net.Core.Level.Fatal;
            case "FINE":
                return log4net.Core.Level.Fine;
            case "FINER":
                return log4net.Core.Level.Finer;
            case "FINEST":
                return log4net.Core.Level.Finest;
            case "INFO":
                return log4net.Core.Level.Info;
            case "NOTICE":
                return log4net.Core.Level.Notice;
            case "OFF":
                return log4net.Core.Level.Off;
            case "SEVERE":
                return log4net.Core.Level.Severe;
            case "TRACE":
                return log4net.Core.Level.Trace;
            case "VERBOSE":
                return log4net.Core.Level.Verbose;
            case "WARN":
                return log4net.Core.Level.Warn;
            default:
                throw new Exception("Invalid logging level specified");
        }
    }

编辑:根据Wily博士的Apprentice的推荐,这是我最终使用LevelMap想出的:

    using System;
    using System.Linq;

    public static Level ParseLevel(string level)
    {
        var loggerRepository = LoggerManager.GetAllRepositories().FirstOrDefault();

        if (loggerRepository == null)
        {
            throw new Exception("No logging repositories defined");
        }

        var stronglyTypedLevel = loggerRepository.LevelMap[level];

        if (stronglyTypedLevel == null)
        {
            throw new Exception("Invalid logging level specified");
        }

        return stronglyTypedLevel;
    }

Answer 1

看起来这就是LevelMap班级的目的.

https://logging.apache.org/log4net/log4net-1.2.11/release/sdk/log4net.Core.LevelMap.html

编辑:你可以得到一个LevelMap从该LevelMap财产的ILoggerRepository,如果你有一个访问.

Answer 2

您可以使用反射来获取日志级别列表，并使用此列表来填充 LevelMap。

using System.Reflection;
using log4net.Core;

namespace MyUtils
{
    /// <summary>
    /// for getting the log level that belongs to a string
    /// </summary>
    public static class LogLevelMap
    {
        static LevelMap levelMap = new LevelMap();

        static LogLevelMap()
        {
            foreach (FieldInfo fieldInfo in typeof(Level).GetFields(BindingFlags.Public | BindingFlags.Static))
            {
                if (fieldInfo.FieldType == typeof(Level))
                {
                    levelMap.Add((Level)fieldInfo.GetValue(null));
                }
            }
        }

        public static Level GetLogLevel(string logLevel)
        {
            if (string.IsNullOrWhiteSpace(logLevel))
            {
                return null;
            }
            else 
            {
                return levelMap[logLevel]; 
            }
        }
    }
}