使用StructureMap NLOG GetCurrentClassLogger（）的NullReferenceException（完全信任） [英] NLog GetCurrentClassLogger() NullReferenceException using StructureMap (Full Trust)

问题描述

好像NLOG不能使用反射对 GetCurrentClassLogger（），即使我的MVC 3应用程序部署在完全信任环境IIS7上。我使用StructureMap 2.6.1和问题似乎部署之间出现零星。我想不通为什么，但我不认为StructureMap导致它做的。

引导程序类：

 公共静态类引导程序
{
    公共静态无效ConfigureStructureMap（）
    {
        ObjectFactory.Initialize（初始化）;
    }    私有静态无效初始化（IInitializationEx pression X）
    {
        x.AddRegistry（新DBServiceRegistry（））;
        x.AddRegistry（新MyRegistry（））;
    }
}
 

注册表类：

 公共类MyRegistry：注册表
{
    公共MyRegistry（）// HttpContext的背景下）
    {
        对于与所述; ILogger＆GT;（）使用＆lt;。NLogLogger＆GT;（）;
        对于与所述; IUserRepository＆GT;（）使用＆lt;。SqlUserRepository＆GT;（）;
    }
}
 

一切的伟大工程的我的机器上的。为什么我得到一个 System.NullReferenceException：部署时未将对象引用设置到对象错误的实例

  [NullReferenceException异常：未将对象引用设置到对象的实例]
   NLog.LogManager.GetCurrentClassLogger（）+84
   lambda_method（封闭，IArguments）+ 40
   StructureMap.Construction＆LT;＆GT; c__DisplayClass2＆LT; CreateBuilder＆GT; b__0（IArguments参数）+22
   StructureMap.Construction.InstanceBuilder.BuildInstance（IArguments参数）+12
   StructureMap.Pipeline.ConstructorInstance.Build（类型pluginType，BuildSession会议，IInstanceBuilder建设者）+88[StructureMapException：StructureMap异常code：207
内部异常，同时创造PluginType Todo.Data.ILogger的实例38000383-149d-45c2-a8f3-7442316da725。详细信息请参考内部异常。]
   StructureMap.Pipeline.ConstructorInstance.Build（类型pluginType，BuildSession会议，IInstanceBuilder建设者）+276
   StructureMap.Pipeline.ConstructorInstance.build（类型pluginType，BuildSession会话）+41
   StructureMap.Pipeline.SmartInstance_1.build（类型pluginType，BuildSession会话）+43
   StructureMap.Pipeline.Instance.createRawObject（类型pluginType，BuildSession会话）+45
   StructureMap.Pipeline.Instance.Build（类型pluginType，BuildSession会话）+36
   StructureMap.Pipeline.ObjectBuilder.Resolve（类型pluginType，实例的实例，BuildSession会话）+103
   StructureMap.BuildSession.CreateInstance（类型pluginType，实例实例）+49
   StructureMap＆LT;方式＆gt;＆c__DisplayClass3 LT; .ctor＆GT; b__1（）+22
   StructureMap.BuildSession.CreateInstance（类型pluginType）+24
   ...等...剪断
 

解决方案

原来这不是一个信任问题，而是一个IoC问题。由于采用了<一个href=\"http://stackoverflow.com/questions/3438162/asp-net-mvc2-ninject-nlog-shared-hosting-nullreferenceexception/6487008#6487008\">NInject解决方案获取转向我在正确的方向。

解决方案

有关日志记录的包装，使用接受一个字符串参数的构造函数：

 公共类NLogLogger：ILogger
{
    私人记录仪_logger;    公共NLogLogger（字符串currentClassName）
    {
        _logger = LogManager.GetLogger（currentClassName）;
    }
    ...
}
 

NLOG StructureMap配置：

 对少于ILogger＆GT;（）使用＆lt;＆NLogLogger GT;（）
    .Ctor＆LT;串GT（currentClassName）
    。是（X =＆GT; x.BuildStack.Root.RequestedType.FullName）;
 

It seems like NLog can't use reflection for GetCurrentClassLogger(), even though my MVC 3 app is deployed in a Full Trust environment on IIS7. I'm using StructureMap 2.6.1 and the problem seems to appear sporadically between deploys. I can't figure out why, though I don't think StructureMap is causing it.

Bootstrapper class:

public static class Bootstrapper
{
    public static void ConfigureStructureMap()
    {
        ObjectFactory.Initialize(Init);
    }

    private static void Init(IInitializationExpression x)
    {
        x.AddRegistry(new DBServiceRegistry());
        x.AddRegistry(new MyRegistry());
    }
}

Registry class:

public class MyRegistry : Registry
{
    public MyRegistry()//HttpContext context)
    {
        For<ILogger>().Use<NLogLogger>();
        For<IUserRepository>().Use<SqlUserRepository>();
    }
}

Everything works great on my machine. Why am I getting a System.NullReferenceException: Object reference not set to an instance of an object error when deploying?

[NullReferenceException: Object reference not set to an instance of an object.]
   NLog.LogManager.GetCurrentClassLogger() +84
   lambda_method(Closure , IArguments ) +40
   StructureMap.Construction.<>c__DisplayClass2.<CreateBuilder>b__0(IArguments args) +22
   StructureMap.Construction.InstanceBuilder.BuildInstance(IArguments args) +12
   StructureMap.Pipeline.ConstructorInstance.Build(Type pluginType, BuildSession session, IInstanceBuilder builder) +88

[StructureMapException: StructureMap Exception Code:  207
Internal exception while creating Instance '38000383-149d-45c2-a8f3-7442316da725' of PluginType Todo.Data.ILogger.  Check the inner exception for more details.]
   StructureMap.Pipeline.ConstructorInstance.Build(Type pluginType, BuildSession session, IInstanceBuilder builder) +276
   StructureMap.Pipeline.ConstructorInstance.build(Type pluginType, BuildSession session) +41
   StructureMap.Pipeline.SmartInstance_1.build(Type pluginType, BuildSession session) +43
   StructureMap.Pipeline.Instance.createRawObject(Type pluginType, BuildSession session) +45
   StructureMap.Pipeline.Instance.Build(Type pluginType, BuildSession session) +36
   StructureMap.Pipeline.ObjectBuilder.Resolve(Type pluginType, Instance instance, BuildSession session) +103
   StructureMap.BuildSession.CreateInstance(Type pluginType, Instance instance) +49
   StructureMap.<>c__DisplayClass3.<.ctor>b__1() +22
   StructureMap.BuildSession.CreateInstance(Type pluginType) +24
   ...etc...snipped

解决方案

Turns out it's not a trust issue, but an IoC issue. Thanks to an NInject solution for steering me in the right direction.

Solution

For your logging wrapper, use a constructor that accepts a string parameter:

public class NLogLogger : ILogger
{
    private Logger _logger;

    public NLogLogger(string currentClassName)
    {
        _logger = LogManager.GetLogger(currentClassName);
    }
    ...
}

NLog StructureMap Config:

For<ILogger>().Use<NLogLogger>()
    .Ctor<string>("currentClassName")
    .Is(x => x.BuildStack.Root.RequestedType.FullName);

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