如何在ASP.NET Webforms中使用Autofac注入NLog

Question

I have an ASP.NET Webforms project that I've been recently converting to use Dependency Injection via Autofac. 我有一个ASP.NET Webforms项目，最近我将其转换为通过Autofac使用依赖注入。 It has all been going well, that is until I tried to inject my NLog instances. 一切都进行得很好，直到我尝试注入NLog实例为止。 I can't work out how to perform the equivalent of the static GetCurrentClassLogger() method calls with the property injected Logger object. 我不知道如何通过注入的属性Logger对象执行与静态GetCurrentClassLogger（）方法调用等效的操作。

Here is my sample code illustrating the problem: 这是说明问题的示例代码：

Global.asax.cs 的Global.asax.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

using Autofac;
using Autofac.Integration.Web;

public class Global : HttpApplication, IContainerProviderAccessor
{
  private static IContainerProvider containerProvider;

  public IContainerProvider ContainerProvider
  {
    get { return containerProvider; }
  }

  void Application_Start(object sender, EventArgs e)
  {
    var builder = new ContainerBuilder();
    Bootstrapper.RegisterInstances(builder);
    containerProvider = new ContainerProvider(builder.Build());
  }
}

Bootstrapper.cs Bootstrapper.cs

using Autofac;

public static class Bootstrapper
{
  public static void RegisterInstances(ContainerBuilder builder)
  {
    builder.RegisterType<Logger>().As<ILogger>().InstancePerRequest();
    builder.RegisterType<MyTestModule>().As<IMyTestModule>().InstancePerRequest();
  }
}

MyTestModule.cs MyTestModule.cs

using System;

public class MyTestModule : IMyTestModule
{
   // was previously: protected static readonly ILogger Logger = LogManager.GetCurrentClassLogger();

  private ILogger _logger;

  public MyTestModule(ILogger logger)
  {
    _logger = logger;
  }

  public void DoSomethingBad()
  {
    try
    {
        int z = 5 / 0;
    }
    catch (Exception ex)
    {
        _logger.Error("Error!", ex);
    }
  }
}

public interface IMyTestModule
{
  void DoSomethingBad();
}

PageBase.cs PageBase.cs

public abstract class PageBase : Page
{
  // was previously: protected static readonly ILogger Logger = LogManager.GetCurrentClassLogger();

  public ILogger Logger { get; set; }

  public IMyTestModule MyTestModuleInstance { get; set; }
}

Default.aspx Default.aspx的

<%@ Page Title="Home" Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="_Default" %>

<html>
  <head></head>
  <body></body>
</html>

Default.aspx.cs Default.aspx.cs

using System;

public partial class _Default : PageBase
{
  protected void Page_Load(object sender, EventArgs e)
  {
    MyTestModuleInstance.DoSomethingBad();
  }
}

You can see in PageBase.cs and MyTestModule.cs I have commented out the previous static calls to create the NLog instance: 您可以在PageBase.cs和MyTestModule.cs中看到我已经注释掉了以前创建NLog实例的静态调用：

protected static readonly ILogger Logger = LogManager.GetCurrentClassLogger();

They are now simply replaced with the Autofac dependency injected property like this: 现在，将它们简单地替换为Autofac依赖项注入属性，如下所示：

public ILogger Logger { get; set; }

This works in so much that the Logger object gets initialised to an instance of the logger. 这样做的工作量很大，以至于Logger对象被初始化为logger的实例。

How do I perform the equivalent of LogManager.GetCurrentClassLogger() ? 如何执行与LogManager.GetCurrentClassLogger（）等效的功能？

Is there something I need to do with NLog modules to achieve this? 我需要使用NLog模块来实现此目的吗？ If there is I've not been able to find any specific examples. 如果没有的话，我还找不到任何具体的例子。 Any help would be much appreciated! 任何帮助将非常感激！

Answer 1

Override the AttachTocomponentRegistaration of your Module: 覆盖模块的AttachTocomponentRegistaration ：

public class AutofacLogInjectionModule : Module
{
    protected override void AttachToComponentRegistration(IComponentRegistry registry, IComponentRegistration registration)
    {
        registration.Preparing += OnComponentPreparing;
    }

    static void OnComponentPreparing(object sender, PreparingEventArgs e)
    {
        e.Parameters = e.Parameters.Union(new[]
    {
        new ResolvedParameter((p, i) => p.ParameterType == typeof(ILogger), (p, i) => LogManager.GetCurrentClassLogger())
    });
    }

}

And Register this module in your bootstrap: 并在您的引导程序中注册此模块：

builder.RegisterModule(new AutofacLogInjectionModule());

如何在ASP.NET Webforms中使用Autofac注入NLog

问题描述

1 个解决方案

解决方案1
3 已采纳 2015-02-23 17:18:50

如何在ASP.NET Webforms中使用Autofac注入NLog

问题描述

1 个解决方案

解决方案1 3 已采纳 2015-02-23 17:18:50

解决方案1
3 已采纳 2015-02-23 17:18:50