MVC5 Controller构造方法获取User为空解决方法

用如下方法获取UserId报空引用异常

1 2 3 4 5 6 7 8 9

public class BaseController : Controller {     protected SiteContext db = new SiteContext();     protected Guid userId;     public BaseController()     {         userId = Guid.Parse(User.Identity.GetUserId());     } }

由于Controller未初始化完成，User为空，重写初始化方法，在初始化(base.Initialize(requestContext);)完成的时候再去获取User即可

解决方法：

1 2 3 4 5 6 7 8 9 10 11 12 13

public class BaseController : Controller {     protected SiteContext db = new SiteContext();     protected Guid userId;     protected override void Initialize(System.Web.Routing.RequestContext requestContext)     {         base.Initialize(requestContext);         if (User.Identity.IsAuthenticated)         {              userId =Guid.Parse(User.Identity.GetUserId());         }     } }