HttpContext.GetOwinContext().GetUserManager<AppRoleManager>() return null
问题 I've used ASP.NET Identity 2 for creating role but the result of HttpContext.GetOwinContext().GetUserManager<AppRoleManager>() was null. Then I couldn't create the role. How can I solve this problem? public class MVCController : Controller { public MVCController() { } public AppRoleManager RoleManager // returns null ?! { get { return HttpContext.GetOwinContext().GetUserManager<AppRoleManager>(); } } public User CurrentUser { get { string currentUserId = User.Identity.GetUserId(); User