Question

我使用MySQL实体框架连接器连接到我的MySQL数据库。

是否与任何功能订单兼容？每当我从下面的代码中删除.OrderBy()时，它都可以正常工作，但有了它我会收到错误。

using Microsoft.AspNet.Identity;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using uQuiz.Domain;
using uQuiz.Domain.Abstract;

namespace uQuiz.WebUI.Controllers
{
    [Authorize]
    public class DashboardController : Controller
    {
        private QuizEntities Context;

        public DashboardController(QuizEntities context)
        {
            this.Context = context;
        }

        /// <summary>
        /// The quiz dashboard
        /// </summary>
        /// <returns></returns>
        public ActionResult Index()
        {
            // Get the logged in user ID
            int userId = Convert.ToInt32(User.Identity.GetUserId());

            IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).OrderBy(d => d.CreatedTime).ToList();

            return View();
        }
    }
}

类型的例外   ＆＃39; System.Data.Entity.Core.EntityCommandExecutionException＆＃39;发生在   EntityFramework.dll但未在用户代码中处理

附加信息：执行命令时发生错误   定义。有关详细信息，请参阅内部异常。

内部异常消息：未知列＆＃39; Project1.C1＆＃39;在＆＃39;字段列表＆＃39;

此作品

IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).ToList();

这不是

IEnumerable<Quiz> usersQuizzes = this.Context.Quizzes.Where(x => x.UserId == userId && x.Deleted == false).OrderBy(d => d.CreatedTime).ToList();

以下是与我的EDMX自动生成的Quiz相关的Quizzes课程：

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace uQuiz.Domain
{
    using System;
    using System.Collections.Generic;

    public partial class Quiz
    {
        public Quiz()
        {
            this.Answers = new HashSet<Answer>();
            this.FeaturedQuizzes = new HashSet<FeaturedQuiz>();
            this.PersonalityOutcomes = new HashSet<PersonalityOutcome>();
            this.PossibleAnswers = new HashSet<PossibleAnswer>();
            this.Questions = new HashSet<Question>();
            this.QuizLinks = new HashSet<QuizLink>();
            this.QuizPasswords = new HashSet<QuizPassword>();
            this.QuizSubmissons = new HashSet<QuizSubmission>();
            this.QuizVersions = new HashSet<QuizVersion>();
            this.ResultDescriptions = new HashSet<ResultDescriptions>();
            this.Takers = new HashSet<Taker>();
        }

        public long Id { get; set; }
        public int UserId { get; set; }
        public long QuizVersionId { get; set; }
        public string IPAddress { get; set; }
        public int IsPublic { get; set; }
        public string QuizType { get; set; }
        public long CreatedTime { get; set; }
        public Nullable<long> BackgroundId { get; set; }
        public string UrlId { get; set; }
        public long PasswordsDisabled { get; set; }
        public long SharedFacebook { get; set; }
        public long SharedTwitter { get; set; }
        public Nullable<bool> Deleted { get; set; }
        public long ShowCorrections { get; set; }
        public long ShowBreakdown { get; set; }
        public string Thumbnail { get; set; }
        public string ShareImage { get; set; }
        public Nullable<long> LinkId { get; set; }
        public long ForceShareImage { get; set; }
        public long ShareCount { get; set; }
        public string BackgroundAlign { get; set; }
        public string BackgroundColour { get; set; }
        public string TextColour { get; set; }

        public virtual ICollection<Answer> Answers { get; set; }
        public virtual ICollection<FeaturedQuiz> FeaturedQuizzes { get; set; }
        public virtual ICollection<PersonalityOutcome> PersonalityOutcomes { get; set; }
        public virtual ICollection<PossibleAnswer> PossibleAnswers { get; set; }
        public virtual ICollection<Question> Questions { get; set; }
        public virtual QuizBackground QuizBackgrounds { get; set; }
        public virtual ICollection<QuizLink> QuizLinks { get; set; }
        public virtual ICollection<QuizPassword> QuizPasswords { get; set; }
        public virtual ICollection<QuizSubmission> QuizSubmissons { get; set; }
        public virtual ICollection<QuizVersion> QuizVersions { get; set; }
        public virtual User Users { get; set; }
        public virtual ICollection<ResultDescriptions> ResultDescriptions { get; set; }
        public virtual ICollection<Taker> Takers { get; set; }
        public virtual QuizVersion QuizVersion { get; set; }
    }
}

更新1

我在同一个项目QuizEntities2内的同一个数据库中生成了一个新的EDMX，这个工作正常，唯一的区别是我没有通过并更改了映射的名称。这是我控制器中的代码。一个是有效的，另一个没有出现错误。

using (QuizEntities context1 = new QuizEntities())
{
    // ERROR: Unknown column 'Project1.C1' in 'field list'
    var quizzes1 = context1.Quizzes.Where(x => x.UserId == 1 && x.Deleted == false).OrderByDescending(x => x.CreatedTime).Skip(5).Take(5).ToList();
}

using (QuizEntities2 context2 = new QuizEntities2())
{
    // Works completely fine
    var quizzes = context2.quizzes.Where(x => x.user_id == 1 && x.deleted == false).OrderByDescending(x => x.created_time).Skip(5).Take(5).ToList();
}

的Web.config

<?xml version="1.0" encoding="utf-8"?>
<!--
  For more information on how to configure your ASP.NET application, please visit
  http://go.microsoft.com/fwlink/?LinkId=169433
  -->
<configuration>
  <configSections>
    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
  </configSections>
  <connectionStrings>
    <add name="QuizEntities" connectionString="metadata=res://*/QuizModel.csdl|res://*/QuizModel.ssdl|res://*/QuizModel.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=localhost;user id=root;database=uquiznew&quot;" providerName="System.Data.EntityClient" />
    <add name="QuizEntities2" connectionString="metadata=res://*/ModelModel.Model1.csdl|res://*/ModelModel.Model1.ssdl|res://*/ModelModel.Model1.msl;provider=MySql.Data.MySqlClient;provider connection string=&quot;server=localhost;user id=root;database=uquiznew2&quot;" providerName="System.Data.EntityClient" />
  </connectionStrings>
  <entityFramework>
    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework" />
    <providers>
      <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6" />
    </providers>
  </entityFramework>
  <appSettings>
    <add key="webpages:Version" value="3.0.0.0" />
    <add key="webpages:Enabled" value="false" />
    <add key="PreserveLoginUrl" value="true" />
    <add key="ClientValidationEnabled" value="true" />
    <add key="UnobtrusiveJavaScriptEnabled" value="true" />
    <add key="owin:AppStartup" value="uQuiz.OwinStart" />
  </appSettings>
  <system.web>
    <compilation debug="true" targetFramework="4.5" />
    <httpRuntime targetFramework="4.5" />
    <pages>
      <namespaces>
        <add namespace="System.Web.Helpers" />
        <add namespace="System.Web.Mvc" />
        <add namespace="System.Web.Mvc.Ajax" />
        <add namespace="System.Web.Mvc.Html" />
        <add namespace="System.Web.Routing" />
        <add namespace="System.Web.WebPages" />
      </namespaces>
    </pages>
  </system.web>
  <system.webServer>
    <validation validateIntegratedModeConfiguration="false" />
    <handlers>
      <remove name="ExtensionlessUrlHandler-Integrated-4.0" />
      <remove name="OPTIONSVerbHandler" />
      <remove name="TRACEVerbHandler" />
      <add name="ExtensionlessUrlHandler-Integrated-4.0" path="*." verb="*" type="System.Web.Handlers.TransferRequestHandler" preCondition="integratedMode,runtimeVersionv4.0" />
    </handlers>
  </system.webServer>
  <runtime>
    <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
      <dependentAssembly>
        <assemblyIdentity name="Newtonsoft.Json" culture="neutral" publicKeyToken="30ad4fe6b2a6aeed" />
        <bindingRedirect oldVersion="0.0.0.0-6.0.0.0" newVersion="6.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Helpers" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-5.2.0.0" newVersion="5.2.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.Optimization" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-1.1.0.0" newVersion="1.1.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="System.Web.WebPages" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="1.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="WebGrease" publicKeyToken="31bf3856ad364e35" />
        <bindingRedirect oldVersion="0.0.0.0-1.5.2.14234" newVersion="1.5.2.14234" />
      </dependentAssembly>
      <dependentAssembly>
        <assemblyIdentity name="Microsoft.Owin" publicKeyToken="31bf3856ad364e35" culture="neutral" />
        <bindingRedirect oldVersion="0.0.0.0-3.0.0.0" newVersion="3.0.0.0" />
      </dependentAssembly>
    </assemblyBinding>
  </runtime>
</configuration>

工作DbContext的等效测验类

自动复制器已经删除了名称并将其命名为Quizze但我还没有改变它，因为我刚刚测试了一个新的EDMX ......

//------------------------------------------------------------------------------
// <auto-generated>
//     This code was generated from a template.
//
//     Manual changes to this file may cause unexpected behavior in your application.
//     Manual changes to this file will be overwritten if the code is regenerated.
// </auto-generated>
//------------------------------------------------------------------------------

namespace uQuiz.Domain.ModelModel
{
    using System;
    using System.Collections.Generic;

    public partial class quizze
    {
        public quizze()
        {
            this.answers = new HashSet<answer>();
            this.featured_quizzes = new HashSet<featured_quizzes>();
            this.personality_outcomes = new HashSet<personality_outcomes>();
            this.possible_answers = new HashSet<possible_answers>();
            this.questions = new HashSet<question>();
            this.quiz_links = new HashSet<quiz_links>();
            this.quiz_passwords = new HashSet<quiz_passwords>();
            this.quiz_submissions = new HashSet<quiz_submissions>();
            this.quiz_versions = new HashSet<quiz_versions>();
            this.result_descriptions = new HashSet<result_descriptions>();
            this.takers = new HashSet<taker>();
        }

        public long quiz_ID { get; set; }
        public long user_id { get; set; }
        public long quiz_version_id { get; set; }
        public string ip_address { get; set; }
        public int @public { get; set; }
        public string quiz_type { get; set; }
        public long created_time { get; set; }
        public Nullable<long> background_id { get; set; }
        public string url_id { get; set; }
        public long passwords_disabled { get; set; }
        public long shared_facebook { get; set; }
        public long shared_twitter { get; set; }
        public Nullable<bool> deleted { get; set; }
        public long show_corrections { get; set; }
        public long show_breakdown { get; set; }
        public string thumbnail { get; set; }
        public string share_image { get; set; }
        public Nullable<long> link_id { get; set; }
        public long force_share_image { get; set; }
        public long share_count { get; set; }
        public string background_align { get; set; }
        public string background_colour { get; set; }
        public string text_colour { get; set; }

        public virtual ICollection<answer> answers { get; set; }
        public virtual ICollection<featured_quizzes> featured_quizzes { get; set; }
        public virtual ICollection<personality_outcomes> personality_outcomes { get; set; }
        public virtual ICollection<possible_answers> possible_answers { get; set; }
        public virtual ICollection<question> questions { get; set; }
        public virtual quiz_backgrounds quiz_backgrounds { get; set; }
        public virtual ICollection<quiz_links> quiz_links { get; set; }
        public virtual quiz_links quiz_links1 { get; set; }
        public virtual ICollection<quiz_passwords> quiz_passwords { get; set; }
        public virtual ICollection<quiz_submissions> quiz_submissions { get; set; }
        public virtual ICollection<quiz_versions> quiz_versions { get; set; }
        public virtual quiz_versions quiz_versions1 { get; set; }
        public virtual user user { get; set; }
        public virtual ICollection<result_descriptions> result_descriptions { get; set; }
        public virtual ICollection<taker> takers { get; set; }
    }
}

Answer 1

除了。在d..CreatedTime中出现两次，（但可能没有解决它） CreatedTime也必须是字段属性，而不是方法。（我怀疑它可能是一种方法）。 Linq尝试将您的命令转换为SQL，SQL知道字段，但不知道您的C＃方法。

此外，按时间戳排序是可疑的，因为值可能都是唯一的，并且不会添加排序。

否则，我们必须检查您的类定义并将其与sql表定义进行比较。

Answer 2

我已经解决了问题所在。我已将Users表上的主键Id的类型更改为Int32，以便我可以将其与Identity Framework一起使用。

当我第一次生成EDMX文件时，它会将其生成为Int64。

我将数据类型更改回原来生成的Int64，然后再次运行。

Answer 3

我也遇到了这个错误，从数据库更新实体模型解决了这个问题。

MySQL实体框架连接器是否与OrderBy（）不兼容？

更新1

3 个答案: