将数据从 ASP .NET MVC 应用程序传递到 NHibernate 事件侦听器

Question

我已经向 orm 添加了一些审计（IPostUpdateEventListener、IPostInsertEventListener、IPostDeleteEventListener）。很好用。问题是我想记录用户名和 ip 地址，从那里完成了对数据库的请求以及其他一些额外信息。

我有 3 个模块：Web、ORM 和 Shared。网络 -> 共享 <- ORM。 Web 通过位于 Shared 上的接口访问 ORM。我怎样才能在请求中添加更多信息？（或者准确地说是 nhibernate 会话）所以我可以从事件监听器代码中调用它。

谢谢:)

Answer 1

找到了解决办法。事件侦听器如下所示：

public class AuditUpdateListener : IPostUpdateEventListener
{

    public void OnPostUpdate(PostUpdateEvent @event)
    {
      // logging code
    }
}

我发现这个 "magic" 对象叫做 CallContext.HostContext https://msdn.microsoft.com/en-us/library/system.runtime.remoting.messaging.callcontext.hostcontext(v=vs.110).aspx

到目前为止没有什么特别的，但是你将它转换为 HttpContext 并且你可以获得所有需要的信息

public class AuditUpdateListener : IPostUpdateEventListener
{

    public void OnPostUpdate(PostUpdateEvent @event)
    {
      var httpContext = CallContext.HostContext as HttpContext;
      var ipAddress = httpContext.Request.UserHostAddress;
      var username = httpContext.User.Identity.Name;
      // some code to get values from httpContext.Request.Cookies
    }
}

Answer 2

这是我的一位听众的例子。它与 NHibernate Cookbook 中的布局几乎相同。请注意，我只有一个方法可以从 HttpContext 或 WindowsIdentity 中获取用户名。如果您知道您总是要通过网络拨打电话，那么您应该始终定义 HttpContext.Current。只需从那里获取任何想要的信息。它应该允许您访问他的请求。

public class EventListener : IPreInsertEventListener, IPreUpdateEventListener
{
    private readonly IStamper _stamper;

    public EventListener() : this(new Stamper()) { }

    public EventListener(IStamper stamper)
    {
        _stamper = stamper;
    }

    #region IPreInsertEventListener Members

    public bool OnPreInsert(PreInsertEvent @event)
    {
        _stamper.Insert(@event.Entity as IStampedEntity, @event.State, @event.Persister);
        return false;
    }

    #endregion

    #region IPreUpdateEventListener Members

    public bool OnPreUpdate(PreUpdateEvent @event)
    {
        _stamper.Update(@event.Entity as IStampedEntity, @event.OldState, @event.State, @event.Persister);
        return false;
    }

    #endregion
}

public interface IStamper
{
    void Insert(IStampedEntity entity, object[] state, IEntityPersister persister);
    void Update(IStampedEntity entity, object[] oldState,  object[] state, IEntityPersister persister);
}

public class Stamper : IStamper
{
    private const String CreateUser = "CreateUser";
    private const String CreateDate = "CreateDate";
    private const String LastUpdateUser = "LastUpdateUser";
    private const String LastUpdateDate = "LastUpdateDate";

    public void Insert(IStampedEntity entity, object[] state, IEntityPersister persister)
    {
        if (entity == null)
            return;

        SetCreate(entity, state, persister);
        SetChange(entity, state, persister);
    }

    public void Update(IStampedEntity entity, object[] oldState, object[] state, IEntityPersister persister)
    {
        if (entity == null)
            return;

        SetChange(entity, state, persister);
    }

    private void SetCreate(IStampedEntity entity, object[] state, IEntityPersister persister)
    {
        entity.CreateUser = GetUserName();
        SetState(persister, state, CreateUser, entity.CreateUser);
        entity.CreateDate = DateTime.UtcNow;
        SetState(persister, state, CreateDate, entity.CreateDate);            
    }

    private void SetChange(IStampedEntity entity, object[] state, IEntityPersister persister)
    {
        entity.LastUpdateUser = GetUserName();
        SetState(persister, state, LastUpdateUser, entity.LastUpdateUser);
        entity.LastUpdateDate = DateTime.UtcNow;
        SetState(persister, state, LastUpdateDate, entity.LastUpdateDate);
    }

    private void SetState(IEntityPersister persister, IList<object> state, String propertyName, object value)
    {
        var index = GetIndex(persister, propertyName);
        if (index == -1)
            return;
        state[index] = value;
    }

    private Int32 GetIndex(IEntityPersister persister, String propertyName)
    {
        return Array.IndexOf(persister.PropertyNames, propertyName);
    }

    private String GetUserName()
    {
        if (HttpContext.Current != null)
            return HttpContext.Current.User.Identity.Name;

        var windowsIdentity = WindowsIdentity.GetCurrent();
        return windowsIdentity != null ? windowsIdentity.Name : String.Empty;
    }
}

将数据从 ASP .NET MVC 应用程序传递到 NHibernate 事件侦听器

passing data from ASP .NET MVC application into NHibernate Event listener

c#

nhibernate

asp.net-mvc

orm