Question

简单来说，我尝试在我的MVC3项目中使用Http Session为Unity框架创建Lifetime管理器。我的终身经理的示例实现是：

    public class UnityPerSessionLifetimeManager : LifetimeManager
    {
        private string sessionKey;
        private HttpContext ctx;

        public UnityPerSessionLifetimeManager(string sessionKey)
        {
            this.sessionKey = sessionKey;
            this.ctx = HttpContext.Current;
        }

        public override object GetValue()
        {
            return this.ctx.Session[this.sessionKey];
        }

        public override void RemoveValue()
        {
            this.ctx.Items.Remove(this.sessionKey);
        }

        public override void SetValue(object newValue)
        {
            this.ctx.Session[this.sessionKey] = newValue;
        }
    }

在我的global.asax.cs中，我用自己的UnityControllerFactory

替换了默认的控制器工厂

    public class UnityControllerFactory : DefaultControllerFactory
    {
        private IUnityContainer container;

        public UnityControllerFactory(IUnityContainer container)
        {
            this.container = container;
            this.RegisterServices();
        }

        protected override IController GetControllerInstance(RequestContext context, Type controllerType)
        {
            if (controllerType != null)
            {
                return this.container.Resolve(controllerType) as IController;
            }

            return null;
        }

        private void RegisterServices()
        {
            this.container.RegisterType<IMyType, MyImpl>(new UnityPerSessionLifetimeManager("SomeKey"));
        }
    }
}

我在UnityPerSessionLifetimeManager类的每个函数上设置了断点，我注意到当控制器工厂尝试解决我的控制器的依赖关系时，HttpContext.Session实际上是null，因此代码无法从会话中检索或保存到会话

知道为什么会话在这个阶段为空？

Answer 1

我的错误，我应该将UnityPerSessionLifetimeManager类的代码更改为

public class UnityPerSessionLifetimeManager : LifetimeManager
{
    private string sessionKey;

    public UnityPerSessionLifetimeManager(string sessionKey)
    {
        this.sessionKey = sessionKey;
    }

    public override object GetValue()
    {
        return HttpContext.Current.Session[this.sessionKey];
    }

    public override void RemoveValue()
    {
        HttpContext.Current.Session.Remove(this.sessionKey);
    }

    public override void SetValue(object newValue)
    {
        HttpContext.Current.Session[this.sessionKey] = newValue;
    }
}

因为当构造函数被调用为注册类型时，会话状态尚未就绪，我已经将该时间的http上下文分配给变量。但在以后的Get / Set函数中，会话状态已准备就绪。

MVC3，Unity Framework和每个会话终身管理器问题

1 个答案: