[英]How to create nlog loggers for various controllers and asp net mvc filters?
[英]How to get named loggers for LogManager (NLog) with Unity
這將是一個漫長的問題,但是請忍受我。 我正在嘗試為我們的應用程序創建一個日志記錄組件,該組件可以擴展為插入新的日志記錄框架(NLog,Log4Net ec)。 現在我知道我們已經有了Ben Foster編寫的Common.Logging門面,但是我想嘗試一些更定制的東西。 在我們的案例中,主要要求之一是,我們需要一種使用日志記錄框架(在這種情況下為NLog)將自定義參數/值記錄到數據庫的自定義機制。 所以我有一個簡單的日志記錄界面:
/// <summary>
/// Interface for implementing a Logger Provider.
/// </summary>
public interface ILogger
{
/// <summary>
/// Logs an Info level diagnostics message.
/// </summary>
/// <param name="logInfo">The Log Info object.</param>
void Info(LogInfo logInfo);
/// <summary>
/// Logs a Warn level diagnostics message.
/// </summary>
/// <param name="logInfo">The Log Info object.</param>
void Warn(LogInfo logInfo);
/// <summary>
/// Logs a Debug level diagnostics message.
/// </summary>
/// <param name="logInfo">The Log Info object.</param>
void Debug(LogInfo logInfo);
/// <summary>
/// Logs an Error level diagnostics message.
/// </summary>
/// <param name="logInfo">The Log Info object.</param>
void Error(LogInfo logInfo);
/// <summary>
/// Logs an Fatal level diagnostics message.
/// </summary>
/// <param name="logInfo">The Log Info object.</param>
void Fatal(LogInfo logInfo);
}
LogInfo對象包含所有必需的日志記錄信息。 我有一個實現該接口的抽象類:
public abstract class NLogLoggerBase : ILogger
{
....
}
歸類為:
public class NLogDatabaseLogger : NLogLoggerBase
{
public NLogDatabaseLogger(ILogUtility logUtility)
: base(logUtility)
{
//Make sure the custom target is registered for use BEFORE using it.
ConfigurationItemFactory.Default.Targets.RegisterDefinition("DatabaseLog", typeof(DatabaseLogTarget));
//initialize the _logger
_logger = LogManager.GetLogger("DatabaseLogger");
}
}
和
public class NLogFileLogger : NLogLoggerBase
{
....
}
數據庫記錄器使用自定義DatabaseTarget(從NLog中的TargetWithLayout繼承)登錄數據庫,並使用File Logger進行同名操作。 NLog的基本設置連接在App.Config中:
<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<configSections>
<section name="nlog" type="NLog.Config.ConfigSectionHandler, NLog" />
</configSections>
<nlog xmlns="http://www.nlog-project.org/schemas/NLog.xsd" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
autoReload="true" throwExceptions="false" internalLogFile="C:\Temp\nlog.txt" internalLogLevel="Info"
internalLogToConsole="false">
<targets async="true">
<target name="CustomDatabaseLog" xsi:type="DatabaseLog" />
<target name="CustomFileLog" xsi:type="File" />
</targets>
<rules>
<logger name="DatabaseLogger" minlevel="Info" writeTo="CustomDatabaseLog" />
<logger name="FileLogger" minlevel="Info" writeTo="CustomFileLog" />
</rules>
</nlog>
</configuration>
到現在為止還挺好。 對於每個記錄器,我都有一些測試,它們可以很好地記錄到各自的目標。
然后,我編寫了一個Logger工廠,它將根據記錄器類型返回ILogger接口的正確實現:
/// <summary>
/// Provides an interface for a factory which returns a logger component.
/// </summary>
public interface ILoggerFactory
{
/// <summary>
/// Creates an instance of logger component based on dependency registration key.
/// </summary>
/// <param name="loggerName">The dependency registration key.</param>
/// <returns>An Instance of logger component.</returns>
ILogger CreateLogger(string loggerName);
}
和實現:
/// <summary>
/// Implementation of ILoggerFactory interface.
/// </summary>
public class NLogLoggerFactory : ILoggerFactory
{
private readonly ILogger _nlogDatabaseLogger;
private readonly ILogger _nlogFileLogger;
public NLogLoggerFactory(ILogger nlogDatabaseLogger, ILogger nlogFileLogger)
{
if (nlogDatabaseLogger == null)
throw new ArgumentNullException("nlogDatabaseLogger");
if (nlogFileLogger == null)
throw new ArgumentNullException("nlogFileLogger");
_nlogDatabaseLogger = nlogDatabaseLogger;
_nlogFileLogger = nlogFileLogger;
}
/// <summary>
/// Creates an instance of logger component based on dependency registration key.
/// </summary>
/// <param name="loggerKey">The dependency registration key.</param>
/// <returns>An Instance of logger component.</returns>
public ILogger CreateLogger(string loggerKey)
{
if (loggerKey.Equals(DependencyRegistrationKeys.NLogDatabaseLoggerKey))
return _nlogDatabaseLogger;
if (loggerKey.Equals(DependencyRegistrationKeys.NLogFileLoggerKey))
return _nlogFileLogger;
throw new ArgumentException("Invalid loggerKey");
}
因此,我將使用Unity進行所有連接。 這是我提出的快速測試案例(我知道它需要重構,但這只是出於說明目的):
[Test]
public void Test_if_logger_factory_returns_correct_implementation()
{
var container = new UnityContainer();
container.RegisterType<ILogUtility, NLogUtility>();
container.RegisterType<ILogger, NLogDatabaseLogger>(DependencyRegistrationKeys.NLogDatabaseLoggerKey);
container.RegisterType<ILogger, NLogFileLogger>(DependencyRegistrationKeys.NLogFileLoggerKey);
container.RegisterType<ILoggerFactory, NLogLoggerFactory>(
new InjectionConstructor(
new ResolvedParameter<ILogger>(DependencyRegistrationKeys.NLogDatabaseLoggerKey),
new ResolvedParameter<ILogger>(DependencyRegistrationKeys.NLogFileLoggerKey)));
var loggerFactory = container.Resolve<ILoggerFactory>();
Assert.IsAssignableFrom<NLogLoggerFactory>(loggerFactory);
var logger = loggerFactory.CreateLogger(DependencyRegistrationKeys.NLogDatabaseLoggerKey);
Assert.IsNotNull(logger);
Assert.IsAssignableFrom<NLogDatabaseLogger>(logger);
}
一切順利,直到我下線:
var loggerFactory = container.Resolve<ILoggerFactory>();
這似乎像預期的那樣擊中了NLogDatabaseLogger的構造函數,並在此行中發生了異常:
//initialize the _logger
_logger = LogManager.GetLogger("DatabaseLogger");
例外:
Required parameter 'FileName' on 'File Target[CustomFileLog_wrapped]' was not specified.
我的猜測是Unity正在努力獲取NLog來獲取命名記錄器實例。 有人遇到過嗎? 有沒有辦法解決? 我整個上午都在為此事而,但沒有骰子。 任何幫助將非常感激!
看看這個問題和我的答案。
問題是關於使用unity解決命名的log4net記錄器,但是我認為您應該能夠對NLog和unity應用相同的過程。
該問題的操作人員撰寫了一篇不錯的博客文章,描述了他為使此功能生效所經過的確切過程。 在他的博客文章中,這些是必需的步驟(假設有一些統一的知識):
在Unity中實現此過程需要三個步驟。
祝好運!
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