Castle Windsor 不会在属性中注入 Logger！

Question

我尝试在我的服务类的 ILogger 属性中注入 log4net，但该属性始终为 NULL！

我看过这个话题，但对我没有帮助！

How can I get Castle Windsor to automatically inject a property?

这是 Program.cs

 CastleContainer.Instance
        .Install(
          new RepositoriesInstaller(),
          new PersistenceInstaller(),
          new LoggerInstaller(),
          new FormInstaller(),
          new ServiceInstaller()

          );

        FrmStart form1 = CastleContainer.Resolve<FrmStart>(new {Id="666" });

我使用 log4net.config 外部文件，这是我的安装程序：

public class LoggerInstaller : IWindsorInstaller
{
    #region IWindsorInstaller Members

    public void Install(IWindsorContainer container, IConfigurationStore store)
    {
         container.AddFacility("logging", new LoggingFacility(LoggerImplementation.Log4net, "log4net.config"));
    }

    #endregion
}

这是包含我希望 Windsor 注入的属性的类：

public partial class FrmStart : Form
{
    private EventService EventService;

    private ILogger logger = NullLogger.Instance;
    public ILogger Logger
    {
        get { return logger; }
        set { logger = value; }
    }

    public FrmStart(EventService eventService, string Id)
        : this()
    {

        Logger.Debug("xxx");

        this.EventService = eventService;
        this.id = Id;
    }

请注意，构造函数中的“eventService”和“Id”是正确注入的！ 如果我尝试在构造函数中注入 Logger，它会起作用，并且我有 Logger 对象： {log4net.Repository.Hierarchy.DefaultLoggerFactory+LoggerImpl}！ :-(

我尝试为 EventService 创建一个公共属性，Windsor 可以正确注入它！所以我认为问题只与 ILogger 接口有关。

我在这里准备了一个简单的完整代码示例：

using Castle.Core.Logging;
using Castle.Facilities.Logging;
using Castle.MicroKernel.Registration;
using Castle.MicroKernel.SubSystems.Configuration;
using Castle.Windsor;

namespace IocTest
{


public class LoggerInstaller : IWindsorInstaller
{
    public void Install(IWindsorContainer container, IConfigurationStore store)
    {
         container.AddFacility("logger", new LoggingFacility(LoggerImplementation.Log4net, "log4net.config"));
    }
}
public class LogicInstaller : IWindsorInstaller
{
     public void Install(IWindsorContainer container, IConfigurationStore store)
    {
        container.Register(AllTypes.FromThisAssembly()
                            .Pick()
                            .If(t => t.Name.StartsWith("Logic"))
                            .Configure((c => c.LifeStyle.Transient)));
    }
}

class Program
{
    static void Main(string[] args)
    {
        IWindsorContainer container = new WindsorContainer();

        container.Install(
        new LoggerInstaller(),
          new LogicInstaller()
          );


        LogicClass1 logic1 = container.Resolve<LogicClass1>();
        LogicClass2 logic2 = container.Resolve<LogicClass2>();
    }
}

public class LogicClass1
{
    private ILogger logger = NullLogger.Instance;
    public ILogger Logger
    {
        get { return logger; }
        set { logger = value; }
    }

    public LogicClass1()
    {
        logger.Debug("Here logger is NullLogger!");
    }
}

public class LogicClass2
{
    public LogicClass2(ILogger logger)
    {
        logger.Debug("Here logger is properly injected!");
    }
}
}

怎么了？

Answer 1

问题出在你检查的地方：

 public ILogger Logger
    {
        get { return logger; }
        set { logger = value; }
    }

    public LogicClass1()
    {
        logger.Debug("Here logger is NullLogger!");
    }

在构造函数运行之后之后才会发生属性注入，因此检查构造函数中的属性值永远不会显示您期望的值

Answer 2

我遇到了同样的问题。一直是null。

我设法通过在构造函数中注入记录器来解决这个问题：

public ILogger logger;

public MyController(ILogger logger)
{
    this.logger = logger;

    logger.Info("Something");
}

Answer 3

您还可以使用以下方法初始化您的 Logger：

public ILogger Logger { get; set; }

public MyController()
{
     Logger = NullLogger.Instance;
}