Unit of Work with StructureMap 3

Question

I'm new with using structuremap and I'm not sure if I configured IoC.cs properly. I have an ASP.Net Project and used Unit Of Work. this is how my IoC.cs file looks like:

IoC.cs

namespace Portal.Web.DependencyResolution {
    using Portal.Data.Context;
    using Portal.Service;
    using Portal.Service.Interface;
    using StructureMap;
    using StructureMap.Pipeline;

    public static class IoC {
        public static IContainer Initialize() {
            return new Container(c => { 
                c.AddRegistry<DefaultRegistry>();
                c.For<IUnitOfWork>().LifecycleIs(Lifecycles.Singleton).Use<PortalDbContext>();
                c.For<IAccount>().Use<AccountService>();
                c.For<IStandard>().Use<StandardService>();
            });
        }
    }
}

with this configuration this error occures some times

System.Data.SqlClient.SqlException: New transaction is not allowed because there are other threads running in the session.

I already have read many other SO questions with same topic as error above and they all suggest to use .toList() and enumerate but I guess that is not my problem.
so for summarize I'd like to use Unit Of Work + Structure Map 3 DI in ASP MVC5, how I configure my IoC.cs

Answer 1

It is very bad idea to use singleton for dbcontext in web application. You should consider to change this to PerHttpRequest lifecycle (if it exists in structuremap) or PerResolve lifecycle:

Per HttpRequest:

For<IUnitOfWork>().LifecycleIs(new HttpContextLifecycle()).Use<PortalDbContext>();

Update: in this case, you should not use your IUnitOfWork in using statement and lay responsibility of disposing it on your DI container.

Per Resolve:

For<IUnitOfWork>().Use<PortalDbContext>();