如何注入命名记录器通用ILogger< T>作为ILogger使用IServiceCollection和NLog进入构造函数

问题描述：

我想将 ILogger< MyClass> 的通用实现注入到 MyClass 的构造函数中，而无需使用其通用参数.

I want to inject the generic implementation of ILogger<MyClass> into the constructor of MyClass without its generic parameters.

示例:

public class MyClass
{
  private readonly ILogger _logger;

  // Inject ILogger<MyClass> as type ILogger
  public MyClass(ILogger logger) 
  {
    _logger = logger;
  }
}

我基本上不想每次都写它的泛型，而是想自动解决它.使用autofac，尽管有一些限制，但我无法使用autofac.

I basically dont want to write its generic type everytime and would want to have it automagically resolved. Using autofac I've been able to resolve this though due to some constraints its not possible to use autofac.

     services.AddLogging(configure =>
     {
       configure.ClearProviders();
       configure.SetMinimumLevel(LogLevel.Trace);
       configure.AddNLog();
     });

答

ILogger 来自依赖项注入系统，它使用通用类型为logger对象注入正确的Logger名称(通用类型为NameSpace.ClassName).

The ILogger comes from the dependency-injection-system, and it uses the generic-type to imbue the logger-object with the correct Logger-name (NameSpace.ClassName from the generic-type).

您可以执行以下操作:

public class MyClass
{
  private readonly ILogger _logger;   // Notice no generic

  public MyClass(ILogger<MyClass> logger) 
  {
    _logger = logger;
    _logger.LogInformation("Hello");
  }
}

或者您可以这样做:

public class MyClass
{
  private readonly ILogger _logger;   // Notice no generic

  public MyClass(ILoggerFactory loggerFactory) 
  {
    _logger = loggerFactory.CreateLogger(GetType().ToString());  // Performance hit
    _logger.LogInformation("Hello");
  }
}

如果您不喜欢MEL-ILogger，则可以直接使用NLog-Logger:

If you don't like MEL-ILogger, then you can just use NLog-Logger directly:

public class MyClass
{
  private static readonly NLog.Logger Logger = NLog.LogManager.GetCurrentClassLogger();

  public MyClass() 
  {
    Logger.Info("Hello");
  }
}

如何注入命名记录器通用ILogger< T>作为ILogger使用IServiceCollection和NLog进入构造函数

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