1

我目前正在使用 MVC 开发自己的简单 CMS，以熟悉 MVC 和 EF。

目前我只有可以包含多个段落的页面。在数据库中，我有 1 页（主页）和 1 段。

在 home 的索引视图中，我调用控制器的 GetParagraph 操作来根据占位符值获取段落。占位符值被正确发送到控制器和查询。但是当查询尝试访问数据库以检索记录时，我遇到了异常。

例外

{"Invalid column name 'ParagraphId'.\r\nInvalid column name 'PageId'.\r\nInvalid column name 'LinkUrl'.\r\nInvalid column name 'LinkText'.\r\nInvalid column name 'LinkTarget'.\r\nInvalid column name 'ImageUrl'.\r\nInvalid column name 'ImageLink'.\r\nInvalid column name 'ImageLinkTarget'.\r\nInvalid column name 'ImageAlt'."}

楷模

    public class Page
        {
            [Key]
            public int PageId { get; set; }
            [DisplayName("Parent")]
            public int? ParentId { get; set; }
            [Required]
            public string Title { get; set; }
            [Required]
            [DisplayName("View name")]
            public string ViewName { get; set; }        
            [DataType(DataType.Date)]
            public DateTime Created = DateTime.Now;
            [Required]
            public bool Published { get; set; }

            public virtual ICollection<Paragraph> Paragraphs { get; set; }

        }
public class Paragraph
    {
        [Key]
        public int ParagraphId { get; set; }

        public int PageId { get; set; }
        public virtual Page Page { get; set; }
        public string Placeholder { get; set; }
        public string Title { get; set; }
        [AllowHtml]
        [DataType(DataType.MultilineText)]
        public string Text { get; set; } 
        public string LinkUrl { get; set; }
        public string LinkText { get; set; }
        public string LinkTarget { get; set; }
        public string ImageUrl { get; set; }
        public string ImageLink { get; set; }
        public string ImageLinkTarget { get; set; }
        public string ImageAlt { get; set; }        

        [DataType(DataType.Date)]
        public DateTime Created = DateTime.Now;

        [Required]
        public bool Published { get; set; }
    }

控制器

public class PzzlController : Controller
    {        
        PzzlDB _db = new PzzlDB();
        public ActionResult GetParagraph(string placeholder)
        {
            var viewModel = _db.Paragraphs.GetParagraphByPlaceholder(placeholder);
            if (viewModel != null)
            {
                return PartialView("~/Views/Shared/Pzzl/_Paragraph.cshtml", viewModel);
            }
            else
            {
                return null;
            }
        }

    }

询问

public static Paragraph GetParagraphByPlaceholder(
          this IQueryable<Paragraph> Paragraph, string placeholder)
        {
            try
            {

                return Paragraph.Single(p => p.Placeholder == placeholder);
            }
            catch (Exception)
            {
                return null;
            }
        }

段落变量的内容

Local = 'System.Linq.IQueryable<Pzzl.Models.Pzzl.Paragraph>' does not contain a definition for 'Local' and no extension method 'Local' accepting a first argument of type 'System.Linq.IQueryable<Pzzl.Models.Pzzl.Paragraph>' could be found (are you missing a using di...

堆栈跟踪

[SqlException (0x80131904): Invalid column name 'ParagraphId'.
Invalid column name 'PageId'.
Invalid column name 'LinkUrl'.
Invalid column name 'LinkText'.
Invalid column name 'LinkTarget'.
Invalid column name 'ImageUrl'.
Invalid column name 'ImageLink'.
Invalid column name 'ImageLinkTarget'.
Invalid column name 'ImageAlt'.]
   System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +1753986
   System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5296058
   System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +558
   System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +1682
   System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +59
   System.Data.SqlClient.SqlDataReader.get_MetaData() +90
   System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +365
   System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite) +1379
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +175
   System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53
   System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +134
   System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41
   System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10
   System.Data.Entity.Infrastructure.Interception.<>c__DisplayClassb.<Reader>b__8() +69
   System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(Func`1 operation, TInterceptionContext interceptionContext, Action`1 executing, Action`1 executed) +93
   System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +320
   System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) +240
   System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +10
   System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +104

[EntityCommandExecutionException: An error occurred while executing the command definition. See the inner exception for details.]
   System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +188
   System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute(ObjectContext context, ObjectParameterCollection parameterValues) +1283
   System.Data.Entity.Core.Objects.<>c__DisplayClass3.<GetResults>b__2() +185
   System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +499
   System.Data.Entity.Core.Objects.<>c__DisplayClass3.<GetResults>b__1() +271
   System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +251
   System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +600
   System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() +89
   System.Lazy`1.CreateValue() +416
   System.Lazy`1.LazyInitValue() +152
   System.Lazy`1.get_Value() +75
   System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() +40
   System.Linq.Enumerable.SingleOrDefault(IEnumerable`1 source) +4078797
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.<GetElementFunction>b__2(IEnumerable`1 sequence) +83
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.ExecuteSingle(IEnumerable`1 query, Expression queryRoot) +107
   System.Data.Entity.Core.Objects.ELinq.ObjectQueryProvider.System.Linq.IQueryProvider.Execute(Expression expression) +197
   System.Data.Entity.Internal.Linq.DbQueryProvider.Execute(Expression expression) +149
   System.Linq.Queryable.SingleOrDefault(IQueryable`1 source, Expression`1 predicate) +287
   Pzzl.Queries.Pzzl.ParagraphQueries.GetParagraphByPlaceholder(IQueryable`1 Paragraph, String placeholder) in C:\Projects\Speeltuin\MVCWebsite\Portfolio\Pzzl\Queries\Pzzl\ParagraphQueries.cs:43
   Portfolio.Controllers.PzzlController.GetParagraphTitle(String placeholder) in C:\Projects\Speeltuin\MVCWebsite\Portfolio\Portfolio\Controllers\PzzlController.cs:17
   lambda_method(Closure , ControllerBase , Object[] ) +180
   System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14
   System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +214
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27
   Castle.Proxies.ControllerActionInvokerProxy.InvokeActionMethod_callback(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +47
   Castle.Proxies.Invocations.ControllerActionInvoker_InvokeActionMethod.InvokeMethodOnTarget() +226
   Castle.DynamicProxy.AbstractInvocation.Proceed() +117
   Glimpse.Core.Extensibility.CastleInvocationToAlternateMethodContextAdapter.Proceed() +48
   Glimpse.Core.Extensibility.ExecutionTimer.Time(Action action) +195
   Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +198
   Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +45
   Glimpse.Core.Extensibility.AlternateTypeToCastleInterceptorAdapter.Intercept(IInvocation invocation) +183
   Castle.DynamicProxy.AbstractInvocation.Proceed() +483
   Castle.Proxies.ControllerActionInvokerProxy.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +235
   System.Web.Mvc.<>c__DisplayClass15.<InvokeActionMethodWithFilters>b__12() +55
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodFilter(IActionFilter filter, ActionExecutingContext preContext, Func`1 continuation) +253
   System.Web.Mvc.<>c__DisplayClass17.<InvokeActionMethodWithFilters>b__14() +21
   System.Web.Mvc.ControllerActionInvoker.InvokeActionMethodWithFilters(ControllerContext controllerContext, IList`1 filters, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +191
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +324
   System.Web.Mvc.Controller.ExecuteCore() +106
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +34
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +19
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +48
   System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
   System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.Mvc.<>c__DisplayClassa.<EndProcessRequest>b__9() +22
   System.Web.Mvc.<>c__DisplayClass4.<Wrap>b__3() +10
   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Func`1 func) +27
   System.Web.Mvc.ServerExecuteHttpHandlerWrapper.Wrap(Action action) +65
   System.Web.Mvc.ServerExecuteHttpHandlerAsyncWrapper.EndProcessRequest(IAsyncResult result) +71
   System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +1097

[HttpException (0x80004005): Fout bij uitvoeren van onderliggende aanvraagelement voor handler 'System.Web.Mvc.HttpHandlerUtil+ServerExecuteHttpHandlerAsyncWrapper'.]
   System.Web.HttpServerUtility.ExecuteInternal(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage, VirtualPath path, VirtualPath filePath, String physPath, Exception error, String queryStringOverride) +3122411
   System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm, Boolean setPreviousPage) +76
   System.Web.HttpServerUtility.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +28
   System.Web.HttpServerUtilityWrapper.Execute(IHttpHandler handler, TextWriter writer, Boolean preserveForm) +19
   System.Web.Mvc.Html.ChildActionExtensions.ActionHelper(HtmlHelper htmlHelper, String actionName, String controllerName, RouteValueDictionary routeValues, TextWriter textWriter) +483
   System.Web.Mvc.Html.ChildActionExtensions.RenderAction(HtmlHelper htmlHelper, String actionName, String controllerName, Object routeValues) +58
   ASP._Page_Views_Home_Index_cshtml.Execute() in c:\Projects\Speeltuin\MVCWebsite\Portfolio\Portfolio\Views\Home\Index.cshtml:10
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy() +197
   System.Web.Mvc.WebViewPage.ExecutePageHierarchy() +81
   System.Web.WebPages.StartPage.RunPage() +17
   System.Web.WebPages.StartPage.ExecutePageHierarchy() +62
   System.Web.WebPages.WebPageBase.ExecutePageHierarchy(WebPageContext pageContext, TextWriter writer, WebPageRenderingBase startPage) +76
   System.Web.Mvc.RazorView.RenderView(ViewContext viewContext, TextWriter writer, Object instance) +222
   System.Web.Mvc.BuildManagerCompiledView.Render(ViewContext viewContext, TextWriter writer) +115
   Castle.Proxies.Invocations.IView_Render.InvokeMethodOnTarget() +188
   Castle.DynamicProxy.AbstractInvocation.Proceed() +117
   Glimpse.Core.Extensibility.CastleInvocationToAlternateMethodContextAdapter.Proceed() +48
   Glimpse.Core.Extensibility.ExecutionTimer.Time(Action action) +195
   Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +198
   Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +45
   Glimpse.Core.Extensibility.AlternateTypeToCastleInterceptorAdapter.Intercept(IInvocation invocation) +183
   Castle.DynamicProxy.AbstractInvocation.Proceed() +483
   Castle.Proxies.IViewProxy.Render(ViewContext viewContext, TextWriter writer) +202
   System.Web.Mvc.ViewResultBase.ExecuteResult(ControllerContext context) +295
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +13
   Castle.Proxies.ControllerActionInvokerProxy.InvokeActionResult_callback(ControllerContext controllerContext, ActionResult actionResult) +39
   Castle.Proxies.Invocations.ControllerActionInvoker_InvokeActionResult.InvokeMethodOnTarget() +182
   Castle.DynamicProxy.AbstractInvocation.Proceed() +117
   Glimpse.Core.Extensibility.CastleInvocationToAlternateMethodContextAdapter.Proceed() +48
   Glimpse.Core.Extensibility.ExecutionTimer.Time(Action action) +195
   Glimpse.Core.Extensions.AlternateMethodContextExtensions.TryProceedWithTimer(IAlternateMethodContext context, TimerResult& timerResult) +198
   Glimpse.Core.Extensibility.AlternateMethod.NewImplementation(IAlternateMethodContext context) +45
   Glimpse.Core.Extensibility.AlternateTypeToCastleInterceptorAdapter.Intercept(IInvocation invocation) +183
   Castle.DynamicProxy.AbstractInvocation.Proceed() +483
   Castle.Proxies.ControllerActionInvokerProxy.InvokeActionResult(ControllerContext controllerContext, ActionResult actionResult) +219
   System.Web.Mvc.<>c__DisplayClass1c.<InvokeActionResultWithFilters>b__19() +23
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultFilter(IResultFilter filter, ResultExecutingContext preContext, Func`1 continuation) +242
   System.Web.Mvc.<>c__DisplayClass1e.<InvokeActionResultWithFilters>b__1b() +21
   System.Web.Mvc.ControllerActionInvoker.InvokeActionResultWithFilters(ControllerContext controllerContext, IList`1 filters, ActionResult actionResult) +177
   System.Web.Mvc.ControllerActionInvoker.InvokeAction(ControllerContext controllerContext, String actionName) +324
   System.Web.Mvc.Controller.ExecuteCore() +106
   System.Web.Mvc.ControllerBase.Execute(RequestContext requestContext) +91
   System.Web.Mvc.ControllerBase.System.Web.Mvc.IController.Execute(RequestContext requestContext) +10
   System.Web.Mvc.<>c__DisplayClassb.<BeginProcessRequest>b__5() +34
   System.Web.Mvc.Async.<>c__DisplayClass1.<MakeVoidDelegate>b__0() +19
   System.Web.Mvc.Async.<>c__DisplayClass8`1.<BeginSynchronous>b__7(IAsyncResult _) +10
   System.Web.Mvc.Async.WrappedAsyncResult`1.End() +62
   System.Web.Mvc.<>c__DisplayClasse.<EndProcessRequest>b__d() +48
   System.Web.Mvc.SecurityUtil.<GetCallInAppTrustThunk>b__0(Action f) +7
   System.Web.Mvc.SecurityUtil.ProcessInApplicationTrust(Action action) +22
   System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +60
   System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9
   System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9628972
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
4

2 回答 2

1

您是否检查了诸如连接字符串之类的明显内容？如果您有多个连接字符串，可能值得检查一下，它不是指本地 MSSQL-express 数据库，而是指另一个（可能是在线）数据库。

看起来您使用的是 EF 代码优先原则。因此，这可能与您的数据库不是最新的有关，或者至少您的模型认为它不是最新的。您可以为此使用迁移，请参阅此链接了解更多信息。

尽管在最后一种情况下，我当然会期待不同的错误消息。

希望这可以帮助..

于 2013-11-28T20:09:51.317 回答
0

我还没有弄清楚是什么导致了我的问题，所以我从一开始就重新开始使用迁移。到目前为止，我还没有再次遇到这个问题。

于 2013-11-29T14:28:54.120 回答