[NullReferenceException: 未将对象引用设置到对象的实例。]
CourseOnline.Search.Controllers.CartController.AddClass(String ClassSN) +562
lambda_method(Closure , ControllerBase , Object[] ) +138
System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +259
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +34
System.Web.Mvc.<>c__DisplayClassd.<InvokeActionMethodWithFilters>b__a() +79
System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +452
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +662
System.Web.Mvc.Controller.ExecuteCore() +143
System.Web.Mvc.<>c__DisplayClass8.<BeginProcessRequest>b__4() +53
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +22
System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +607
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +134
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