如何使用Entity Framework 6解决System.TypeInitializationException [英] How to solve System.TypeInitializationException with Entity Framework 6

问题描述

我开始在笔记本电脑上开发MVC应用程序，该应用程序运行VS2013和SQL Server 2008 R2。我将这个项目复制到运行Visual Studio 2013，SQL Server 2012 Developer Edition的桌面计算机上。



当我从桌面运行这个MVC应用程序时，我得到以下内容我设置初始化程序的行上的错误，如下所示：

  public   class  MvcApplication：System.Web.HttpApplication 
 {
  protected   void  Application_Start（）
 {
 Database.SetInitializer< LiquorContext>（ new  LiquorContextInitializer（））;  //  此处发生异常 
 AreaRegistration.RegisterAllAreas（）; 
 FilterConfig.RegisterGlobalFilters（GlobalFilters.Filters）; 
 RouteConfig.RegisterRoutes（RouteTable.Routes）; 
 BundleConfig.RegisterBundles（BundleTable.Bundles）; 
} 
} 

这是我得到的例外：

附加信息：'System.Data.Entity.DropCreateDatabaseAlways`1'的类型初始值设定项引发异常。



我用Nuget控制台更新我的软件包如下：

Update-Package -reinstall EntityFramework

Update-Package -reinstall Microsoft.AspNet.Identity.EntityFramework

Update-Package -reinstall Microsoft.Owin.Host.SystemWeb

Update-Package -reinstall Microsoft.Owin .Security.Cookies



到目前为止我的尝试都没有，我无法弄清楚需要改变什么才能解决这个问题。



任何帮助都将不胜感激。



注意：我注意到实体框架版本已从版本6.1.2更改到6.1.3，但我在更新实体框架包之前收到了这个错误。

解决方案

我在项目中使用Moq。所以我安装了它然后安装了它的依赖项。

有可能你是一些依赖。

I started developing an MVC app on my laptop, which was running VS2013, and SQL server 2008 R2. I copied this project over to my desktop computer running Visual Studio 2013, SQL server 2012 Developer Edition.

When I run this MVC app from my Desktop, I get the following error on the line where I set the Initializer, as can be seen below:

public class MvcApplication : System.Web.HttpApplication
    {
        protected void Application_Start()
        {
            Database.SetInitializer<LiquorContext>(new LiquorContextInitializer()); //Exception happens here
            AreaRegistration.RegisterAllAreas();
            FilterConfig.RegisterGlobalFilters(GlobalFilters.Filters);
            RouteConfig.RegisterRoutes(RouteTable.Routes);
            BundleConfig.RegisterBundles(BundleTable.Bundles);
        }
    }

This is the exception I get:
Additional information: The type initializer for 'System.Data.Entity.DropCreateDatabaseAlways`1' threw an exception.

I have used Nuget console to update my packages, as follow:
Update-Package -reinstall EntityFramework
Update-Package -reinstall Microsoft.AspNet.Identity.EntityFramework
Update-Package -reinstall Microsoft.Owin.Host.SystemWeb
Update-Package -reinstall Microsoft.Owin.Security.Cookies

None of my attempts have worked so far, and I cannot figure out what needs to change to fix this.

Any help would be appreciated.

NB: I have noticed the Entity Framework version has changed from version 6.1.2 to 6.1.3, but I was receiving this error before I updated Entity Framework Package.

解决方案

I was using Moq with my project. So I installed it and then installed its dependencies.
There is a chance that you are some dependencies.

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