-1
例外:未将对象引用设置为对象的实例。在UserManager.GetRoles(Convert.ToInt32(userid))上获取空例外
{System.NullReferenceException: Object reference not set to an instance of an object.
at System.Web.HttpContextExtensions.GetOwinEnvironment(HttpContext context)
at System.Web.HttpContextExtensions.GetOwinContext(HttpContext context)