[NullReferenceException: 未将对象引用设置到对象的实例。]
ASP.<>c__DisplayClass20.<Execute>b__1d(Manufacturer c) +53
System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source, Func`2 predicate) +178
ASP._Page_Views_Main_RomList_cshtml.Execute() +5724
System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +251
System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +137
System.Web.WebPages.StartPage.ExecutePageHierarchy() +85
System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +106
System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +377
System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +30
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +448
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +448
System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +448
System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +659
System.Web.Mvc.Controller.ExecuteCore() +146
System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91
System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +60
System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +25
System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +36
System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +431
System.Web.HttpApplication.ExecuteStepImpl(IExecutionStep step) +75
System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +158
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