为什么我的温莎城堡控制器工厂的GetControllerInstance()被调用用null值? [英] Why is my Castle Windsor controller factory's GetControllerInstance() being called with a null value?

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问题描述

我使用温莎城堡管理控制器实例(除其他事项外)。我的控制器工厂看起来是这样的:

 公共类WindsorControllerFactory:DefaultControllerFactory
    {
        私人WindsorContainer _container;        公共WindsorControllerFactory()
        {
            _container =新WindsorContainer(新XmlInter preTER());            VAR controllerTypes从t =在Assembly.GetExecutingAssembly()。GetTypes()
                                  其中,typeof运算(控制器).IsAssignableFrom(T)
                                  选择吨;            的foreach(在controllerTypes T型)
            {
                _container.AddComponentLifeStyle(t.FullName,T,LifestyleType.Transient);
            }
        }        保护覆盖一个IController GetControllerInstance(类型controllerType)
        {
            回报(一个IController)_container.Resolve(controllerType); // ArgumentNullException在这里抛出
        }

当我开始了我的ASP.Net MVC应用程序,并尝试去/(或其他路径),我得到一个ArgumentNullException。我把一个破发点上GetControllerInstance的条目,并发现它与我的HomeController中,再进行第二次的时间与空(也就是当抛出异常)调用一次。为什么它被再次调用?

我应该改变的方法是这样的:

 保护覆盖一个IController GetControllerInstance(类型controllerType)
{
    如果(controllerType == NULL)
        返回null;    回报(一个IController)_container.Resolve(controllerType);
}


解决方案

原来,第二个请求是MVC框架试图找到一个脚本我列入的Site.Master。该路径并不存在,所以我想它试图解决一个控制器(匹配/Scripts/sitescripts.js)。我改变了方法如下:

 保护覆盖一个IController GetControllerInstance(类型controllerType)
{
    如果(controllerType!= NULL)
    {
       回报(一个IController)_container.Resolve(controllerType);
    }
    其他
    {
       返回base.GetControllerInstance(controllerType);
    }
}

和带有一个可以理解的消息抛出异常。

I am using Castle Windsor to manage controller instances (among other things). My controller factory looks like this:

public class WindsorControllerFactory : DefaultControllerFactory
    {
        private WindsorContainer _container;

        public WindsorControllerFactory()
        {
            _container = new WindsorContainer(new XmlInterpreter());

            var controllerTypes = from t in Assembly.GetExecutingAssembly().GetTypes()
                                  where typeof(Controller).IsAssignableFrom(t)
                                  select t;

            foreach (Type t in controllerTypes)
            {
                _container.AddComponentLifeStyle(t.FullName, t, LifestyleType.Transient);
            }
        }

        protected override IController GetControllerInstance(Type controllerType)
        {
            return (IController)_container.Resolve(controllerType); // ArgumentNullException is thrown here
        }

When I start up my ASP.Net MVC application and try to go to "/" (or another path), I get an ArgumentNullException. I put a break point on entry of the GetControllerInstance and found that it's called once with my HomeController, then a second time with null (which is when the exception is thrown). Why is it being called again?

Should I change the method to something like this:

protected override IController GetControllerInstance(Type controllerType)
{
    if (controllerType == null)
        return null;

    return (IController)_container.Resolve(controllerType);
}

解决方案

It turns out that the second request was the MVC framework trying to find a script I included in the Site.Master. The path did not exist, so I guess it tried to resolve a controller (that matched /Scripts/sitescripts.js). I changed the method to this:

protected override IController GetControllerInstance(Type controllerType)
{
    if (controllerType != null)
    {
       return (IController)_container.Resolve(controllerType);
    }
    else
    {
       return base.GetControllerInstance(controllerType);
    }
}

And an exception with an understandable message was thrown.

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