将 SQL Server Compact 4.0.0.1 与 Entity Framework 4.3 一起使用

Question

错误：

Could not load System.Data.SqlServerCe.Entity.dll. Reinstall SQL Server Compact.

内部异常：

{"Could not load file or assembly 'System.Data.SqlServerCe.Entity, Version=4.0.0.1, Culture=neutral, PublicKeyToken=89845dcd8080cc91' or one of its dependencies. The located assembly's manifest definition does not match the assembly reference. (Exception from HRESULT: 0x80131040)":"System.Data.SqlServerCe.Entity, Version=4.0.0.1, Culture=neutral, PublicKeyToken=89845dcd8080cc91"}

复制步骤：

1. 创建新的 MVC3 应用程序

2. 添加 Nuget 包EntityFramework.SqlServerCompact

   <package id="EntityFramework.SqlServerCompact" version="4.1.8482.2" />

3. 创建模型

   public class TaskItem
   {
       [Key]
       public int Id { get; set; }
       public string Description { get; set; }
   }
   

4. 创建数据库上下文

   public class TestContext : DbContext
   {
       public DbSet<TaskItem> TaskItems { get; set; }
   }
   

5. 家庭控制器

   public ActionResult Index()
   {
       var db = new TestContext();
       // breakpoint on Add() below
       db.TaskItems.Add(new TaskItem { Description = "Get shit done."});
       return View();
   }
   

6. Web.config 连接字符串和运行时和 System.Data

   <add name="ApplicationServices" connectionString="Data Source=|DataDirectory|Test.sdf" providerName="System.Data.SqlServerCe.4.0" />

   <runtime>
       <assemblyBinding xmlns="urn:schemas-microsoft-com:asm.v1">
         <dependentAssembly>
           <assemblyIdentity name="System.Web.Mvc" publicKeyToken="31bf3856ad364e35" />
           <bindingRedirect oldVersion="1.0.0.0-2.0.0.0" newVersion="3.0.0.0" />
         </dependentAssembly>
         <dependentAssembly>
           <assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845dcd8080cc91" culture="neutral" />
           <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
         </dependentAssembly>
       </assemblyBinding>
     </runtime>
     <system.data>
       <DbProviderFactories>
         <remove invariant="System.Data.SqlServerCe.4.0" />
         <add name="Microsoft SQL Server Compact Data Provider 4.0" invariant="System.Data.SqlServerCe.4.0" description=".NET Framework Data Provider for Microsoft SQL Server Compact" type="System.Data.SqlServerCe.SqlCeProviderFactory, System.Data.SqlServerCe, Version=4.0.0.0, Culture=neutral, PublicKeyToken=89845dcd8080cc91" />
       </DbProviderFactories>
     </system.data>
   

问题：

Web.config 都是默认的...这里没有什么时髦的...所有的 DLL 都是在本地复制并在 bin 中...我错过了什么？这一定是非常简单的事情。

---

更新：

从 web.config 中删除 Dependent Assembly 部分解决了问题，但我仍然需要解释原因才能关闭答案。

Answer 1

从您的 web.config 中删除依赖程序集绑定

  <dependentAssembly>
    <assemblyIdentity name="System.Data.SqlServerCe" publicKeyToken="89845dcd8080cc91" culture="neutral" />
    <bindingRedirect oldVersion="0.0.0.0-4.0.0.1" newVersion="4.0.0.1" />
  </dependentAssembly>

Answer 2

检查此代码是否在您的项目中创建

EntityFramework.SqlServerCompact.cs under the App_Start folder

using System.Data.Entity;
using System.Data.Entity.Infrastructure;

[assembly: WebActivator.PreApplicationStartMethod(typeof(MyStory.Tests.App_Start.EntityFramework_SqlServerCompact), "Start")]

namespace MyStory.Tests.App_Start {
    public static class EntityFramework_SqlServerCompact {
        public static void Start() {
            Database.DefaultConnectionFactory = new SqlCeConnectionFactory("System.Data.SqlServerCe.4.0");
        }
    }
}