Question

I am trying to create completely Singleton applications (Web and Console). But the Entity DbContext should be used PerWebRequest on web.

How should I register it on container to support this? I understand once the class has been initialized as a singleton, I will be running on a single instance on Memory with all injected classes as a Singleton too.

The following code is my Container Initialization for all web applications and console applications. - How should I register when it is running in Console? - When running on Web and Owin calls startup things, sometimes I need to resolve objects to use on Authentication, but Owin runs on "no context" environment. How to detect and use it?

    private static IContainer Initialize(IContainer container)
    {
        if (container == null)
            container = new Container(
                rules => rules
                    .WithDefaultReuseInsteadOfTransient(Reuse.InWebRequest)
                    .WithFactorySelector(Rules.SelectLastRegisteredFactory())
                    .With(FactoryMethod.ConstructorWithResolvableArguments)
                    .WithoutThrowOnRegisteringDisposableTransient(),
                scopeContext: new AsyncExecutionFlowScopeContext()
            );

        string prefix = GetPrefix();

        var implementingClasses =
            AppDomain.CurrentDomain.GetAssemblies().ToList()
                .Where(x => x.FullName.StartsWith(prefix))
                .SelectMany(x => x.GetTypes())
                .Where(type =>
                    (type.Namespace != null && type.Namespace.StartsWith(prefix)) &&
                    type.IsPublic &&                    // get public types 
                    !type.IsAbstract &&                 // which are not interfaces nor abstract
                    type.GetInterfaces().Length != 0);  // which implementing some interface(s)

        Parallel.ForEach(implementingClasses, implementingClass =>
        {
            container.RegisterMany(new[] { implementingClass }, Reuse.Singleton, serviceTypeCondition: type => type.IsInterface);
        });

        return container;
    }

Answer 1

当您使用环境范围上下文时，您可以在单身中使用/注入DbContext为Func<DbContext>。然后，每当调用Func时，它将返回绑定到当前环境范围/请求的值。

DryIoc with all classes Singleton and DbContext as WebRequest

1 个答案: