调试EF源代码环境配置

1. 下载EF6的源代码，运行build编译，Nuget会自动下载所需的DLL.
2. 打开EF的工程，可以在EF解决方案下直接新建调试用的项目代码
3. 添加EF引用时选择解决方案中的Entity Framework项目和SQLServer项目
4. 修改配置文件
   1. 需要指定System.Data.SqlClient所在的Provide程序集，也就是在EntityFramework.SqlServer项目中

   2. 需要添加entityFramework Section定义

   3. 数据库配置信息

   4.  1 <configuration>
       2   <configSections>
       3     <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=64024bf7194bbc38" requirePermission="false" />
       4   </configSections>
       5   <startup>
       6     <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5" />
       7   </startup>
       8   <connectionStrings>
       9     <add name="db" connectionString="Data Source=(localdb)\v11.0;Initial Catalog=School;Integrated Security=True;Connect Timeout=15;Encrypt=False;TrustServerCertificate=False" providerName="System.Data.SqlClient" />
      10   </connectionStrings>
      11   <entityFramework>
      12     <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
      13       <parameters>
      14         <parameter value="v11.0" />
      15       </parameters>
      16     </defaultConnectionFactory>
      17     <providers>
      18       <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
      19     </providers>
      20   </entityFramework>
      21 </configuration>

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