您可以在App.config文件（EF5 Code first migrations and SQL Server CE 4.0 ）：

You could try this in your App.config file (EF5 Code first migrations and SQL Server CE 4.0):

<connectionStrings>
    <add name="DefaultConnection"
         providerName="System.Data.SqlServerCe.4.0"
         connectionString="Data Source=|DataDirectory|\Data\ProjectDb.sdf"/>
</connectionStrings>

在你 ProjectDb class： p>

And in you ProjectDb class:

class ProjectDb : DbContext
{
    public ProjectDb()
        : base("DefaultConnection")
    {

    }
}

工作就像一个魅力。

您可以在这里找到更多信息： http://blogs.msdn.com/b/adonet/archive /2011/01/27/using-dbcontext-in-ef-feature-ctp5-part-2-connections-and-models.aspx

You can find more information here: http://blogs.msdn.com/b/adonet/archive/2011/01/27/using-dbcontext-in-ef-feature-ctp5-part-2-connections-and-models.aspx