Why is my DbContext being disposed? How can I stop it or work around it?

Question

I am getting an ObjectDisposedException on my dbContext object on the last line of this unit test:

public class InvoiceRepository_Tests : AppTestBase
{
    [Fact]
    public async Task Test_InsertAndQuery()
    {
        var invoiceRepository = Resolve<IRepository<InvoiceHistory, long>>();
        var invoice = new InvoiceHistory() { Reference = "1", Payments = new List<Payment> { new Payment() } };
        var ihId = await invoiceRepository.InsertAndGetIdAsync(invoice);
        var readInvoice = await invoiceRepository
            .Query(q => q.Where(ih => ih.Id == ihId))
            .Include(ih => ih.Payments)
            .FirstOrDefaultAsync();
    }
}

If I replace the last line with:

        var readInvoice = invoiceRepository.Get(ihId);

I don't get the error (and do get my parent record), but then I seem to have no option to populate my Payments collection.

I'm not disposing the DbContext anywhere on purpose. In fact, as far as I can tell the only place I've touched it is to add the DbSet's for these two tables and establish the HasMany relationship in OnModelCreating().

I've tried adding [UnitOfWork] to the test, which is the only suggestion I could find elsewhere, but it didn't change the behaviour.

For starters, you shouldn't be Resolving service references that way, you should be using constructor injection. Second, You probably have the dependency injection lifestyle to transient or scoped/request. — Erik Funkenbusch, Jan 08 '18 at 23:31

score 1 · Accepted Answer · answered Jan 09 '18 at 00:04

You can Begin the UnitOfWork explicitly:

[Fact]
public async Task Test_InsertAndQuery()
{
    var invoiceRepository = Resolve<IRepository<InvoiceHistory, long>>();
    var unitOfWorkManager = Resolve<IUnitOfWorkManager>();

    using (var uow = unitOfWorkManager.Begin())
    {
        var invoice = new InvoiceHistory() { Reference = "1", Payments = new List<Payment> { new Payment() } };
        var ihId = await invoiceRepository.InsertAndGetIdAsync(invoice);
        var readInvoice = await invoiceRepository
            .Query(q => q.Where(ih => ih.Id == ihId))
            .Include(ih => ih.Payments)
            .FirstOrDefaultAsync();

        // ...

        await uow.CompleteAsync();
    }
}

[UnitOfWork] attribute is not used on Test methods as the Test class may not be injected.

Why is my DbContext being disposed? How can I stop it or work around it?

1 Answers1