正文

值不能为 null。参数名: source

玲珑旅游攻略 V管理员 /1 阅读
“/”应用程序中的服务器错误。 值不能为 null。参数名: source 说明: 执行当前 Web 请求期间，出现未经处理的异常。请检查堆栈跟踪信息，以了解有关该错误以及代码中导致错误的出处的详细信息。

异常详细信息: System.ArgumentNullException: 值不能为 null。参数名: source

源错误:

行 30: if (parameter.toId > 0)行 31: {行 32: var city = hotCity.FirstOrDefault(c => c.Item1 == parameter.toId);行 33: if (city != null) { toCity = city.Item3; }行 34: if (string.IsNullOrEmpty(toCity)) 源文件: d:\alltrip\alltrip\Views\Line\LineList.cshtml    行: 32

堆栈跟踪:

[ArgumentNullException: 值不能为 null。参数名: source]System.Linq.Enumerable.FirstOrDefault(IEnumerable`1 source, Func`2 predicate) +297ASP._Page_Views_Line_LineList_cshtml.Execute() in d:\alltrip\alltrip\Views\Line\LineList.cshtml:32System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +252System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +148System.Web.WebPages.StartPage.ExecutePageHierarchy() +86System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +107System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +375System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +88System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilterRecursive(IList`1 filters, Int32 filterIndex, ResultExecutingContext preContext, ControllerContext controllerContext, ActionResult actionResult) +775System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +81System.Web.Mvc.Async.c__DisplayClass3_1.b__1(IAsyncResult asyncResult) +188System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +38System.Web.Mvc.c.b__152_1(IAsyncResult asyncResult, ExecuteCoreState innerState) +26System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +52System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +39System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +38System.Web.Mvc.c.b__20_1(IAsyncResult asyncResult, ProcessRequestState innerState) +40System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +68System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +38System.Web.CallHandlerExecutionStep.InvokeEndHandler(IAsyncResult ar) +212System.Web.CallHandlerExecutionStep.OnAsyncHandlerCompletion(IAsyncResult ar) +166 版本信息: Microsoft .NET Framework 版本:4.0.30319; ASP.NET 版本:4.7.3930.0