Question

我使用了WebForms（旧版）+ ASP.NET MVC + SimpleInjector

public abstract class CustomBaseController : Controller
{
    protected User user;
    protected IAppDbContext repo;
    public CustomBaseController(User user, IAppDbContext repo)
    {
        this.user = user;
        this.repo = repo;
    }
}
// my controller
[MyCustomAuthorize]
public class MyCustomController : CustomBaseController
{
    public MyCustomController(User user, IAppDbContext repo) : base(user, repo)
    {
    }

    [HttpPost]
    public ActionResult PostMethod()
    {
        user.Name = "NewUserName"; // throw NullReferenceException that user is null
        // some logic
        // some logger
    }
}
// user entity
public class User
{
    public Guid Id { get; protected set; }
    public string Email { get; protected set; }
    public string DisplayName { get; protected set; }

    public string FirstName { get; protected set; }
    public string LastName { get; protected set; }

    // and other properties
}

// Register DI
private static void InitializeContainer()
{
    var container = new Container();
    container.Register<IUserSessionManagement, UserSessionManagement >(Lifestyle.Scoped);
    container.Register<User>(() => container.GetInstance<UserSessionManagement>().UserSession, Lifestyle.Scoped);
    DependencyResolver.SetResolver(new SimpleInjectorDependencyResolver(container));
}

// Wrapper for User 
public class UserSessionManagement : IUserSessionManagement
{
    public User UserSession { get; }
    public UserSessionManagement(IAppDbContext repo)
    {
        UserSession = (HttpContext.Current.Session[SESSION_AUTHENTICATED_USER] as User) ?? new User(Guid.Empty, null, null);
    }
}

基于cookie的授权。
SimpleInjector解析所有依赖关系和cannot null parameter。如果parameter为null，则在构造函数上将引发异常。

我在user请求中捕获了NullReferenceException（/PostMethod为空）。我一直在寻找可以删除参考资料的任何地方。没有。参考无法重写。看来GC已清除所有链接。

注意：我无法在调试中重现此内容。我从日志中知道了这个问题。

注意1：MyCustomController创建成功（user不为空）。发布请求以期望用户为空。

Answer 1

看看这个答案Here

我们必须查看您的CustomBaseController才能查看更多。

public MyCustomController() : base()
{
}

您可能只需要一个无参数的构造函数。

从构造函数NRE ASP.NET

1 个答案: