StructureMap is not disposing data context when using HttpContextScoped()

问题

My goal is to have one data context (MainDbContext) per HTTP request in ASP.NET MVC and dispose the data context when the request ends.

I'm using the following StructureMap configuration:

public static class ContainerConfigurer
{
    public static void Configure()
    {
        ObjectFactory.Initialize(x =>
        {
            x.For<MainDbContext>().HttpContextScoped();
        });
    }
}

Whenever I need a MainDbContext, I'm using this code:

var dbContext = ObjectFactory.GetInstance<MainDbContext>();

This is working as expected: only one data context is being created per HTTP request. The problem is, MainDbContext is not being disposed at the end of the request.

How can I configure my ObjectFactory to dispose the data context when the HTTP request finishes? Or is this just something I need to do manually using Application_EndRequest() in Global.asax.

Update

I just tried adding the following code to Global.asax:

protected virtual void Application_EndRequest()
{
    ObjectFactory.GetInstance<MainDbContext>().Dispose();
}

As expected, this solves the problem. I'm still wondering if there's any way to do this automatically with StructureMap, however.

回答1:

Instead of:

x.For<MainDbContext>().HttpContextScoped();

Try:

x.For<MainDbContext>().HttpContextScoped().Use(() => new MainDbContext());

Also normally it's repository classes that need a db context. So instead of ObjectFactory.GetInstance<MainDbContext>(); have your repositories take some interface db context and configure StructureMap to inject the MainDbContext into them. Then make StructureMap inject repositories into controllers, ...

In Application_EndRequest:

protected void Application_EndRequest()
{
    ObjectFactory.ReleaseAndDisposeAllHttpScopedObjects();
}

回答2:

Using a nested container is the only way to get Structure Map to automatically dispose objects. If you're not using that technique the only way is to dispose the objects yourself using either the way the OP described (pulling the object from the container and disposing it; see this NHibernate example for one way to do it) or to scope the object to HttpRequest and call ReleaseAndDisposeAllHttpScopedObjects as Darin described.

来源：https://stackoverflow.com/questions/6390608/structuremap-is-not-disposing-data-context-when-using-httpcontextscoped