问题描述
注意:更新了建议的改进,接近但仍然不完全!
Note: Updated with suggested improvements, closer but still not quite there!
类似于这个问题 - 使用 Autofac 传入 NLog 的声明类的类型 - 我试图将 NLog 实例注入到我的存储库类中.
Similar to this question - Passing in the type of the declaring class for NLog using Autofac - I am trying to inject NLog instances into my repository classes.
界面:
public interface ILogger<T>
where T: class
{
...
}
实施:
public class NLogger<T> : ILogger<T>
where T: class
{
private readonly Logger _logger;
public NLogger()
{
_logger = LogManager.GetLogger(typeof(T).FullName);
}
public void Debug(string message)
{
_logger.Debug(message);
}
...
}
在 Autofac 注册为:
Registered with Autofac as:
builder.RegisterGeneric(typeof (NLogger<>)).As(typeof (ILogger<>));
使用断点,我看到 Autofac 正在为我的所有各种存储库创建一堆具有正确类型的 ILogger/NLogger,但结果日志显示调用站点为NLog.LoggerImpl.Write".
Using breakpoints, I see that Autofac is creating a bunch of ILogger/NLogger's with the correct types for all of my various repositories, but the resulting logs show up with callsite being "NLog.LoggerImpl.Write".
感谢您的帮助!
使用泛型的工作解决方案:
Working solution with generics:
public class NLogger<T> : ILogger<T>
where T: class
{
private readonly Logger _logger;
public NLogger()
{
_logger = LogManager.GetLogger(typeof(T).FullName);
}
public void Debug(string message)
{
_logger.Log(typeof(T), new LogEventInfo(LogLevel.Debug, _logger.Name, message));
}
推荐答案
Logger 包装器需要调用 .Log() 并传递附加信息以使 callsite 工作.例如:
Logger wrappers need to call .Log() and pass additional info for callsite to work. For example:
_logger.Log(typeof (NLogger<T>), new LogEventInfo(LogLevel.Debug, _logger.Name, null, format, args));
由于您仍然遇到问题,因此我是这样做的,而且我知道它的行为是正确的:
Since you're still having trouble, here's how I do it, and I know it's behaving correctly:
public interface ILog
{
[StringFormatMethodAttribute("format")]
void Debug(string format, params object[] args);
[StringFormatMethodAttribute("format")]
void Info(string format, params object[] args);
[StringFormatMethodAttribute("format")]
void Warn(string format, params object[] args);
[StringFormatMethodAttribute("format")]
void Error(string format, params object[] args);
void Error(Exception ex);
[StringFormatMethodAttribute("format")]
void Error(Exception ex, string format, params object[] args);
[StringFormatMethodAttribute("format")]
void Fatal(Exception ex, string format, params object[] args);
}
public class NLogLogger : ILog
{
private readonly Logger _log;
public NLogLogger(Type type)
{
_log = LogManager.GetLogger(type.FullName);
}
public void Debug(string format, params object[] args)
{
Log(LogLevel.Debug, format, args);
}
public void Info(string format, params object[] args)
{
Log(LogLevel.Info, format, args);
}
public void Warn(string format, params object[] args)
{
Log(LogLevel.Warn, format, args);
}
public void Error(string format, params object[] args)
{
Log(LogLevel.Error, format, args);
}
public void Error(Exception ex)
{
Log(LogLevel.Error, null, null, ex);
}
public void Error(Exception ex, string format, params object[] args)
{
Log(LogLevel.Error, format, args, ex);
}
public void Fatal(Exception ex, string format, params object[] args)
{
Log(LogLevel.Fatal, format, args, ex);
}
private void Log(LogLevel level, string format, object[] args)
{
_log.Log(typeof (NLogLogger), new LogEventInfo(level, _log.Name, null, format, args));
}
private void Log(LogLevel level, string format, object[] args, Exception ex)
{
_log.Log(typeof (NLogLogger), new LogEventInfo(level, _log.Name, null, format, args, ex));
}
}
public class LoggingModule : Module
{
protected override void Load(ContainerBuilder builder)
{
builder
.Register((c, p) => new NLogLogger(p.TypedAs<Type>()))
.AsImplementedInterfaces();
}
protected override void AttachToComponentRegistration(IComponentRegistry componentRegistry, IComponentRegistration registration)
{
registration.Preparing +=
(sender, args) =>
{
var forType = args.Component.Activator.LimitType;
var logParameter = new ResolvedParameter(
(p, c) => p.ParameterType == typeof(ILog),
(p, c) => c.Resolve<ILog>(TypedParameter.From(forType)));
args.Parameters = args.Parameters.Union(new[] { logParameter });
};
}
}
这篇关于使用 Autofac 的 RegisterGeneric 注入 NLog的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!