ADO.NET EF how to set FK with Code First - constraints

Question

I have these classes that describes my DB model:
public class Blog
{
public int BlogId { get; set; }
public string Name { get; set; }
public string Url { get; set; }
public virtual List<Post> Posts { get; set; }
}
public class Post
{
public int PostId { get; set; }
public string Title { get; set; }
public string Content { get; set; }
public int BlogId { get; set; }
public virtual Blog Blog { get; set; }
}
public class User
{
public int UserId { get; set; }
public string Username { get; set; }
public string DisplayName { get; set; }
}
public class BloggingContext : DbContext
{
public DbSet<Blog> Blogs { get; set; }
public DbSet<Post> Posts { get; set; }
public DbSet<User> Users { get; set; }
}
It's working fine, but when I try to add FK constraint in App.Config like this:
<entityFramework>
<defaultConnectionFactory type="System.Data.Entity.Infrastructure.SqlConnectionFactory, EntityFramework">
<parameters>
<parameter value="System.Data.SqlClient" />
</parameters>
</defaultConnectionFactory>
<Association Name="UserBlogs">
<End Type="CodeFirstNewDatabaseSample.BloggingContext.User" Role="User" Multiplicity="1" >
<OnDelete Action="Cascade" />
</End>
<End Type="CodeFirstNewDatabaseSample.BloggingContext.Blog" Role="Blog" Multiplicity="*" />
<ReferentialConstraint>
<Principal Role="User">
<PropertyRef Name="UserId" />
</Principal>
<Dependent Role="Blog">
<PropertyRef Name="UserId" />
</Dependent>
</ReferentialConstraint>
</Association>
</entityFramework>
I get an error that App.Config has threw an error. How can I add FKeys using this code as a sample and is App.Config the right place to do that?

Answer 1

The modelbuilder is my preferred method of configuring FKs with Entity Framework
Check out my blog post which goes into the details of how to do this here: http://blog.staticvoid.co.nz/2012/7/17/entity_framework-navigation_property_basics_with_code_first