DbContext Custom Connection String about dbcontextscope HOT 4 OPEN

 var dbContext = _dbContextFactory != null 
   ? _dbContextFactory.CreateDbContext<TDbContext>()
   : Activator.CreateInstance<TDbContext>();

public async Task<Foo> GetFooAsync(Guid id)
{
    using (var dbContextScope = _dbContextScopeFactory.CreateReadOnly())
    {
        return await dbContextScope.DbContexts.Get<FooDbContext>()
            .Foo
            .FirstOrDefaultAsync(q => q.Id == id);
    }
}

container.Register<IDbContextScopeFactory>(() => new DbContextScopeFactory(new SimpleInjectorDbContextFactory(container)), Lifestyle.Scoped);

internal class SimpleInjectorDbContextFactory : IDbContextFactory
{
    readonly Container _container;

    public SimpleInjectorDbContextFactory(Container container)
    {
        _container = container;
    }

    public TDbContext CreateDbContext<TDbContext>() where TDbContext : DbContext
    {
        return _container.GetInstance<TDbContext>();
    }
}

public class TaskManagementDbContext : DbContext
{
    public TaskManagementDbContext(IConnectionStringResolver csr) :
        base(csr.GetConnectionString("Default"))
    {
    }
}

public class TaskRepository : ITaskRepository
{
    private readonly IAmbientDbContextLocator _ambientDbContextLocator;

    private TaskManagementDbContext DbContext
    {
        get
        {
            // MissingMethodException thrown "No parameterless constructor defined for this object"
            var dbContext = _ambientDbContextLocator.Get<TaskManagementDbContext>();
            ...
        }
    }