2017-02-02 58 views
1

我對C#和Visual Studio MVC相當陌生,並且正在處理一個簡單的項目,我需要實現一個可以通過表單發佈的評論頁面(我還沒有實現) 。這是我的問題,我不斷收到'無效的列ID'錯誤。我一直在網上查找所有的答案,但沒有發現任何改變我的問題。我來自Java,所以有些概念對我來說並不是很明顯,特別是從昨天開始。無效的列名C#

這裏是我的背景:

namespace MonLivredor.Models { 
public class CommentaireContext: DbContext { 
    public CommentaireContext() {} 
    public IDbSet <Commentaire> Liste { 
     get; 
     set; 
    } 
    protected override void OnModelCreating(DbModelBuilder modelBuilder) { 
     Database.SetInitializer <CommentaireContext> (null); 
     base.OnModelCreating(modelBuilder); 
     } 
    } 
} 

,這裏是我的控制器:

using MonLivredor.Models; 
using System; 
using System.Collections.Generic; 
using System.Data.Entity; 
using System.Linq; 
using System.Web; 
using System.Web.Mvc; 

namespace MonLivredor.Controllers 
{ 
public class CommentaireController : Controller 
{ 
    private CommentaireContext context = new CommentaireContext(); 
    // GET: Commentaire 
    public ActionResult Commentaire() 
    { 

     Commentaire com1 = new Commentaire("Jacky", "[email protected]", "Bonjour je m'apelle Jacky et j'aime le C#"); 
     Commentaire com2 = new Commentaire("Bobby", "[email protected]", "Bonjour je m'apelle Bobby et je deteste le Java"); 

     if (context.Liste.Count() == 0) 
     { 
      context.Liste.Add(com1); 
      context.Liste.Add(com2); 
      context.SaveChanges(); 
      return View(context); 
     } 
     else 
     { 
      return View(context); 
     } 
    } 

型號:

namespace MonLivredor.Models 
{ 
[Table("Commentaires")] 
public class Commentaire 
{ 
    [Key] 
    public int ID { get; set; } 
    [Required] 
    public String Nom { get; set; } 
    public String Mail { get; set; } 
    public String Message { get; set; } 
    public DateTime date; 
    public int i = 0; 

    public Commentaire(String nom, String mail, String message) 
    { 
     date = DateTime.Now; 
     this.Nom = nom; 
     this.Mail = mail; 
     this.Message = message; 
     ID = i; 
     i++; 
    } 

    public Commentaire() 
    { 
     date = DateTime.Now; 
    } 


} 
} 

在我看來,我只是希望能夠看到的消息:

@model MonLivredor.Models.CommentaireContext 
<h1>Commentaires</h1> 

<tr> 
@foreach (var com in Model.Liste) 
{ 
    <td> 
     <a href="mailto:com.Mail">@com.Nom @com.date</a> 
     <p>@com.Message</p> 
    </td> 

} 
</tr> 

對不起,亂碼,我一直在用這個撕掉我的頭髮,答案可能是愚蠢的。當我得到錯誤時,我被重定向到視圖頁面上:

@foreach (var com in Model.Liste) 

錯誤'無效的列名ID'。

堆棧跟蹤:

[SqlException (0x80131904): Invalid column name 'ID'.] 
    System.Data.SqlClient.SqlConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +2442126 
    System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection, Action`1 wrapCloseInAction) +5736904 
    System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj, Boolean callerHasConnectionLock, Boolean asyncClose) +628 
    System.Data.SqlClient.TdsParser.TryRun(RunBehavior runBehavior, SqlCommand cmdHandler, SqlDataReader dataStream, BulkCopySimpleResultSet bulkCopyHandler, TdsParserStateObject stateObj, Boolean& dataReady) +3731 
    System.Data.SqlClient.SqlDataReader.TryConsumeMetaData() +58 
    System.Data.SqlClient.SqlDataReader.get_MetaData() +89 
    System.Data.SqlClient.SqlCommand.FinishExecuteReader(SqlDataReader ds, RunBehavior runBehavior, String resetOptionsString) +379 
    System.Data.SqlClient.SqlCommand.RunExecuteReaderTds(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, Boolean async, Int32 timeout, Task& task, Boolean asyncWrite, SqlDataReader ds, Boolean describeParameterEncryptionRequest) +2026 
    System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method, TaskCompletionSource`1 completion, Int32 timeout, Task& task, Boolean asyncWrite) +375 
    System.Data.SqlClient.SqlCommand.RunExecuteReader(CommandBehavior cmdBehavior, RunBehavior runBehavior, Boolean returnStream, String method) +53 
    System.Data.SqlClient.SqlCommand.ExecuteReader(CommandBehavior behavior, String method) +240 
    System.Data.SqlClient.SqlCommand.ExecuteDbDataReader(CommandBehavior behavior) +41 
    System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +12 
    System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.<Reader>b__c(DbCommand t, DbCommandInterceptionContext`1 c) +9 
    System.Data.Entity.Infrastructure.Interception.InternalDispatcher`1.Dispatch(TTarget target, Func`3 operation, TInterceptionContext interceptionContext, Action`3 executing, Action`3 executed) +72 
    System.Data.Entity.Infrastructure.Interception.DbCommandDispatcher.Reader(DbCommand command, DbCommandInterceptionContext interceptionContext) +356 
    System.Data.Entity.Internal.InterceptableDbCommand.ExecuteDbDataReader(CommandBehavior behavior) +166 
    System.Data.Common.DbCommand.ExecuteReader(CommandBehavior behavior) +12 
    System.Data.Entity.Core.EntityClient.Internal.EntityCommandDefinition.ExecuteStoreCommands(EntityCommand entityCommand, CommandBehavior behavior) +37 

[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) +112 
    System.Data.Entity.Core.Objects.Internal.ObjectQueryExecutionPlan.Execute(ObjectContext context, ObjectParameterCollection parameterValues) +744 
    System.Data.Entity.Core.Objects.<>c__DisplayClass7.<GetResults>b__6() +97 
    System.Data.Entity.Core.Objects.ObjectContext.ExecuteInTransaction(Func`1 func, IDbExecutionStrategy executionStrategy, Boolean startLocalTransaction, Boolean releaseConnectionOnSuccess) +288 
    System.Data.Entity.Core.Objects.<>c__DisplayClass7.<GetResults>b__5() +154 
    System.Data.Entity.SqlServer.DefaultSqlExecutionStrategy.Execute(Func`1 operation) +189 
    System.Data.Entity.Core.Objects.ObjectQuery`1.GetResults(Nullable`1 forMergeOption) +279 
    System.Data.Entity.Core.Objects.ObjectQuery`1.<System.Collections.Generic.IEnumerable<T>.GetEnumerator>b__0() +11 
    System.Data.Entity.Internal.LazyEnumerator`1.MoveNext() +45 
    System.Collections.Generic.List`1..ctor(IEnumerable`1 collection) +381 
    System.Linq.Enumerable.ToList(IEnumerable`1 source) +58 
    MonLivredor.Controllers.CommentaireController.Commentaire() in C:\Users\Bob\documents\visual studio 2015\Projects\MonLivredor\MonLivredor\Controllers\CommentaireController.cs:26 
    lambda_method(Closure , ControllerBase , Object[]) +62 
    System.Web.Mvc.ActionMethodDispatcher.Execute(ControllerBase controller, Object[] parameters) +14 
    System.Web.Mvc.ReflectedActionDescriptor.Execute(ControllerContext controllerContext, IDictionary`2 parameters) +157 
    System.Web.Mvc.ControllerActionInvoker.InvokeActionMethod(ControllerContext controllerContext, ActionDescriptor actionDescriptor, IDictionary`2 parameters) +27 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.<BeginInvokeSynchronousActionMethod>b__39(IAsyncResult asyncResult, ActionInvocation innerInvokeState) +22 
    System.Web.Mvc.Async.WrappedAsyncResult`2.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethod(IAsyncResult asyncResult) +32 
    System.Web.Mvc.Async.AsyncInvocationWithFilters.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3d() +50 
    System.Web.Mvc.Async.<>c__DisplayClass46.<InvokeActionMethodFilterAsynchronouslyRecursive>b__3f() +225 
    System.Web.Mvc.Async.<>c__DisplayClass33.<BeginInvokeActionMethodWithFilters>b__32(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeActionMethodWithFilters(IAsyncResult asyncResult) +34 
    System.Web.Mvc.Async.<>c__DisplayClass2b.<BeginInvokeAction>b__1c() +26 
    System.Web.Mvc.Async.<>c__DisplayClass21.<BeginInvokeAction>b__1e(IAsyncResult asyncResult) +100 
    System.Web.Mvc.Async.WrappedAsyncResult`1.CallEndDelegate(IAsyncResult asyncResult) +10 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Async.AsyncControllerActionInvoker.EndInvokeAction(IAsyncResult asyncResult) +27 
    System.Web.Mvc.Controller.<BeginExecuteCore>b__1d(IAsyncResult asyncResult, ExecuteCoreState innerState) +13 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecuteCore(IAsyncResult asyncResult) +36 
    System.Web.Mvc.Controller.<BeginExecute>b__15(IAsyncResult asyncResult, Controller controller) +12 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +22 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.Controller.EndExecute(IAsyncResult asyncResult) +26 
    System.Web.Mvc.Controller.System.Web.Mvc.Async.IAsyncController.EndExecute(IAsyncResult asyncResult) +10 
    System.Web.Mvc.MvcHandler.<BeginProcessRequest>b__5(IAsyncResult asyncResult, ProcessRequestState innerState) +21 
    System.Web.Mvc.Async.WrappedAsyncVoid`1.CallEndDelegate(IAsyncResult asyncResult) +29 
    System.Web.Mvc.Async.WrappedAsyncResultBase`1.End() +49 
    System.Web.Mvc.MvcHandler.EndProcessRequest(IAsyncResult asyncResult) +28 
    System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.EndProcessRequest(IAsyncResult result) +9 
    System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +9744373 
    System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 

感謝您的幫助

+0

Commentaires數據庫表是什麼樣子的? 「ID」專欄預計將在那裏出現。 –

+0

我還沒有創建一個,所以也許這就是問題所在......我們的老師引導我們完成了一些步驟,而沒有進行任何數據庫創建,並且我的一些伴侶在沒有創建數據庫的情況下使其工作。 –

+0

它看起來像你試圖手動實現身份/自動編號列。不要那麼做(如果這就是你想用'i'做的) –

回答

5

你應該n要使用的DbContext類直接您的模型視圖。您的控制器操作應負責使用DbContext從數據庫獲取數據並將其傳遞給View。你正在做的方式不會提供模型視圖控制器模式的好處,而是你濫用MVC模式。視圖應該只知道它將從控制器接收什麼類型的模型,現在數據獲取代碼在您的視圖中是不正確的方法。

您已在視圖做兩件事情錯了,首先你所有的模型申報的應List<MonLivredor.Models.Commentaire>,所以它改成:

@model List<MonLivredor.Models.Commentaire> 
<h1>Commentaires</h1> 

<tr> 
@foreach (var com in Model) 
{ 
    <td> 
     <a href="mailto:com.Mail">@com.Nom @com.date</a> 
     <p>@com.Message</p> 
    </td> 

} 

,然後在你的行動有許多問題,您需要查詢結果表格數據庫,如果沒有結果,則在2個項目之後,您可以再次從數據庫查詢結果:

public ActionResult Commentaire() 
{ 
    IQueryable<Commentaire> result = context.Liste; 
    if (!result.Any()) 
    { 

     context.Liste.Add(new Commentaire("Jacky", "[email protected]", "Bonjour je m'apelle Jacky et j'aime le C#")); 
     context.Liste.Add(new Commentaire("Bobby", "[email protected]", "Bonjour je m'apelle Bobby et je deteste le Java")); 
     context.SaveChanges(); 

    } 

    return View(result.ToList()); 
} 

您還需要更改模型的構造是:

public Commentaire(int id,String nom, String mail, String message) 
{ 
    date = DateTime.Now; 
    this.Nom = nom; 
    this.Mail = mail; 
    this.Message = message; 
    ID = id; 
} 

,並從控制器或另一種選擇是越多越好是使通過數據庫自動生成的ID列值可以用做傳遞ID值@bilpor答案,但在更新模型後,您必須運行遷移以使用新更改更新表格。

+0

好吧,剛剛做到了,我仍然得到無效的列ID,但現在指向返回View(result.ToList()); –

+0

你可以添加錯誤的詳細信息,它看起來像插入行時出現的錯誤 –

+0

woops似乎我在錯誤的部分添加... –

0

根據您的模型[key]添加以下內容。

[DatabaseGenerated(DatabaseGeneratedOption.Identity)]

,並刪除你在哪裏試圖設置它的行。這應該可以解決問題

+0

好的,謝謝,我做到了,但仍然有問題。我在流浪,如果我的表評論是不是在以下問題: [表('備註']] –

+0

這不應該是一個問題,但bilpor指向正確的方向,你不是在創建'Commentaire'時自己分配ID對象,你想插入,所以它會失敗,因爲你沒有在模型中提到它會自動生成,所以它會失敗 –

+0

「public int i = 0;」的聲明需要被刪除,並且你在聲明日期的那一行需要添加一個'{get; set;}'。這將在DB中創建表,並且需要被允許寫入。 – bilpor