asp.net-mvc – 在Asp.Net MVC应用程序中使用Structuremap将ISes

另一种选择(并不总是最好,但易于使用)是：

实现ISession和ISessionFactory接口(SessionProxy和SessionFactoryProxy).

public class SessionAggregator : ISession {
    protected ISession session;

    public SessionAggregator(ISessionFactory theFactory) {
        if (theFactory == null)
            throw new ArgumentNullException("theFactory","theFactory is null.");
        Initialise(theFactory);
    }

    protected virtual void Initialise(ISessionFactory factory) {
        session = factory.OpenSession();
    }
    // the ISession implementation - proxy calls to the underlying session  
 }

public class SessionFactoryAggregator : ISessionFactory {
    protected static ISessionFactory factory;
    private static locker = new object();
    public SessionFactoryAggregator() {
            if (factory == null) {
              lock(locker) {
                if (factory == null)
                  factory = BuildFactory();
              }
            }
    }

    // Implement the ISessionFactory and proxy calls to the factory                
}

这样您就可以注册ISession(由SessionAggregator实现)和ISessionFactory(SessionFactoryAggreagator),任何DI框架都可以轻松解析ISession.

如果您的DI不支持工厂方法(我不知道结构图是否支持),这很好.

我已将这些实现添加到我的Commons程序集中,所以我不应该每次都重新实现它.

编辑：现在,在Web应用程序中使用ISession：

>在结构图中注册SessionFactoryAggregator(生命周期可以是单例).
>在Snstrucure映射中注册SessionAggregator并将其生命周期设置为InstanceScope.Hybrid.
>在每个请求结束时,您需要通过调用HttpContextBuildPolicy.DisposeAndClearAll()来处置会话

代码可能如下所示：

// The Registry in StructureMap
ForRequestedType<ISessionFactory>()
        .CacheBy(InstanceScope.Singleton)
        .TheDefaultIsConcreteType<SessionFactoryAggregator>();

ForRequestedType<ISession>()
        .CacheBy(InstanceScope.Hybryd)
        .TheDefaultIsConcreteType<SessionAggregator>();

// Then in EndRequest call
HttpContextBuildPolicy.DisposeAndClearAll()