[英]Invalid Column Name C#
我对C#和Visual Studio MVC还是很陌生,并且正在从事一个简单的项目,在该项目中,我需要实现可以通过表单发布的评论页面(我尚未实现)。 这是我的问题,我不断收到“无效列ID”错误。 我一直在网上查找所有答案,但没有找到能解决我问题的任何方法。 我来自Java,因此某些概念对我而言并不真正明显,特别是自从昨天开始以来。
这是我的上下文:
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);
}
}
}
这是我的控制器:
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", "Jacky@gmail.com", "Bonjour je m'apelle Jacky et j'aime le C#");
Commentaire com2 = new Commentaire("Bobby", "Bobby@gmail.com", "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);
}
}
模型:
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;
}
}
}
在我看来,我只希望能够看到以下消息:
@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>
抱歉,代码混乱,我已经把它弄乱了,答案可能很愚蠢。 收到错误后,我将重定向到该行的视图页面:
@foreach (var com in Model.Liste)
错误“无效的列名称ID”。
堆栈跟踪:
[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
谢谢你的帮助
您应该直接在View DbContext
类用作模型。 您的控制器操作应负责使用DbContext
从数据库获取数据并将其传递给View。 您所做的方式不会提供Model View Controller模式的好处,而是您正在滥用MVC模式。 视图只应该知道它将从控制器接收什么类型的模型,现在在您看来,数据获取代码不是正确的方法。
您做错了几件事,首先在View中声明的模型声明应该是List<MonLivredor.Models.Commentaire>
,因此List<MonLivredor.Models.Commentaire>
更改为:
@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>
}
然后在您的操作中有很多问题,您需要从数据库中查询结果,如果没有结果,那么在添加了两个项目之后,您可以再次从数据库中查询结果:
public ActionResult Commentaire()
{
IQueryable<Commentaire> result = context.Liste;
if (!result.Any())
{
context.Liste.Add(new Commentaire("Jacky", "Jacky@gmail.com", "Bonjour je m'apelle Jacky et j'aime le C#"));
context.Liste.Add(new Commentaire("Bobby", "Bobby@gmail.com", "Bonjour je m'apelle Bobby et je deteste le Java"));
context.SaveChanges();
}
return View(result.ToList());
}
您还需要将模型构造函数更改为:
public Commentaire(int id,String nom, String mail, String message)
{
date = DateTime.Now;
this.Nom = nom;
this.Mail = mail;
this.Message = message;
ID = id;
}
并通过控制器或其他更好的选择传递ID值,更好的方法是使数据库自动生成ID
列值,这可以使用@bilpor答案来完成,但是在更新模型之后,您将必须运行迁移来更新表有了新的变化。
在模型的[key]
下添加以下内容。
[DatabaseGenerated(DatabaseGeneratedOption.Identity)]
并删除您要设置它的行。 这应该解决问题
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