Question

I am using StructureMap for creating instance of DbEntities per request in ASP.NET.

ObjectFactory.Initialize(x =>
{
    x.For<DbEntities>().HttpContextScoped().Use(CreateNewDbEntities); 
}

I have a bacgkround task running every 5 seconds which is trying to use DbEntities.

timer = new Timer(RunTasks, null, 1000 * 10/*time to wait until the first run*/, 1000 * 5/*time to wait between calls*/);

Now in method RunTasks I get null reference excption when I try to call GetDbEntities

private static void RunTasks(object sender)
{
    var muninService = GetDbEntities(); // Null reference excpetion
}

public static DbEntities GetDbEntities()
{
    return ObjectFactory.GetInstance<DbEntities>();
}

I am guessing this is becauase in a background thread I don’t have access to httpcontextscope. Now I am new to structure map and I don’t know were to start and fix this problem. Any ideas ?

Other methods that I use:

private static DbEntities CreateNewDbEntities()
{
    return new DbEntities();
}

Answer 1

Try:

ObjectFactory.Initialize(x =>
{
    x.For<DbEntities>().HybridHttpOrThreadLocalScoped().Use(CreateNewDbEntities); 
}

This should cache the instance per thread if a HttpContext is not available.