Question

I’m building an MVC3 application with form authentication and a single hierarchical entity. The entity has a Region object as the “root” with several other objects. It looks something like:

Region->Language->objectA->objectB
Region->Application->….

Each user (other than administrators) is associated with single region. I’d like to limit the data loaded to the entity based on the user’s region. I’m not too familiar with EF. Is this appropriate or is there a better approach? How would I implement the best approach

Answer 1

You can certainly filter the data returned via Entity Framework. The code would look something like this:

using (MyContext ctx = new MyContext())
{
    var filtered = (from r in ctx.Regions where SOME_CONDITIONS select r);
    // Do stuff with filtered (which is an IEnumerable<Region>)
}

Note that you may need to use Include to load related objects, e.g.

ctx.Regions.Include("Language").Include("Application")

see http://msdn.microsoft.com/en-us/library/bb896272.aspx