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什么也不说先贴代码
<?xml version="1.0" encoding="utf-8"?>
<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=4.4.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
</configuration>
<?xml version="1.0" encoding="utf-8"?>
<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=4.4.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<connectionStrings>
<add name="EntityContextEntities" connectionString="metadata=res://*/Model1.csdl|res://*/Model1.ssdl|res://*/Model1.msl;provider=System.Data.SqlClient;provider
connection string="data source=.;initial catalog=EntityContext;integrated security=True;MultipleActiveResultSets=True;App=EntityFramework""
providerName="System.Data.EntityClient" />
</connectionStrings>
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0" />
<!--<parameter value="Data Source=.;Integrated Security=True" />-->
</parameters>
</defaultConnectionFactory>
</entityFramework>
</configuration>
以上是我在配置是出的问题，我当时采用的是默认数据库连接测试
在EF中我大致看到了三种数据库连接的Factory，我用到了LocalDbConnectionFactory和SqlConnectionFactory，这两个在配置上有一定的差异，而且默认配置不能指定数据库名
<?xml version="1.0" encoding="utf-8"?>
<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=4.4.0.0, Culture=neutral,
PublicKeyToken=b77a5c561934e089" requirePermission="false" />
</configSections>
<entityFramework>
<!--<defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
<parameters>
<parameter value="v11.0"/>
<parameter value="Data Source=.;Initial Catalog=EntityContext;User ID=sa; Password=123456;MultipleActiveResultSets=True" />
</parameters>
</defaultConnectionFactory>-->
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<!--<parameter value="v11.0"/>-->
<parameter value="Data Source=.;Initial Catalog=EntityContext;User ID=sa; Password=123456;MultipleActiveResultSets=True" />
</parameters>
</defaultConnectionFactory>
</entityFramework>
<connectionStrings>
<add name="EntityContext" connectionString="Data Source=.; Database=EntityContext; User ID=sa; Password=123456;" providerName="System.Data.SqlClient"/>
</connectionStrings>
</configuration>
经过反复测试，（Model frist和DB frist的数据库连接信息是放在connectionStrings标签内，code frist则放在entityFramework的parameter中，且连接字符串需要加上
MultipleActiveResultSets=True）
还有就是更换System.Data.Entity.Infrastructure.SqlConnectionFactory数据库工厂类，
如果使用MSSQL，要用SqlConnectionFactory这个链接库和自己命名的数据库名，并在<connectionStrings>标签下写链接配置，代码中确定连接的名字。
public EntityContext()
: base("name=EntityContext")//此处不是数据库名，是链接字符串的名字
{
}
EntityFramework数据库配置（code frist）
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原文地址：http://www.cnblogs.com/RainbowInTheSky/p/4461053.html
