'System.Data.Entity.Migrations.DbMigrationsConfiguration`1'的类型初始值设定项引发了异常 [英] The type initializer for 'System.Data.Entity.Migrations.DbMigrationsConfiguration`1' threw an exception

问题描述

我有ASP.Net MVC个站点.

技术堆栈

• ASP.Net 4.6
• C#.Net
• EF 6
• MySQL-数据库

当我尝试使用Nuget命令生成数据库时:-

While I am trying to generate the database using Nuget command:-

Enable-Migrations -force

我收到以下异常

"System.Data.Entity.Migrations.DbMigrationsConfiguration`1"的类型初始值设定项引发了异常.

The type initializer for 'System.Data.Entity.Migrations.DbMigrationsConfiguration`1' threw an exception.

以下内容已经经过交叉检查和检查；我尝试过:-

• 类型"System.Data.Entity.Internal.AppConfig"的初始化程序在子网站上引发了异常

类型"System.Data.Entity.Internal.AppConfig"的初始化程序引发了异常

代码优先"无法启用迁移

我的App.Config:-

My App.Config:-

 <connectionStrings>
<add name="mydbContext" providerName="MySql.Data.MySqlClient" connectionString="Server=localhost;port=8080;database=mydb;uid=root;password=" />
</connectionStrings>



<entityFramework>
<defaultConnectionFactory type="MySql.Data.Entity.MySqlConnectionFactory,   MySql.Data.Entity.EF6" />
<providers>
  <provider invariantName="MySql.Data.MySqlClient" type="MySql.Data.MySqlClient.MySqlProviderServices, MySql.Data.Entity.EF6, Version=6.8.8.0, Culture=neutral, PublicKeyToken=c5687fc88969c44d"></provider>
</providers>

推荐答案

在Entity Framework中，The type initializer错误最有可能是由于Web.config文件格式错误，例如具有两个或多个连接字符串部分，或者在连接字符串本身，例如无效的提供程序.

In Entity Framework The type initializer error is most likely due to malformed Web.config files, like having two or more sections of connection string, or having problem in the connection string itself, such as invalid provider.

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