Switching DbSet by name

Question

I've been searching for an answer for hours. I've read many similar posts but still cannot get to the point. In geolocating an ASPNET MVC website I need to switch between 'n' tables depending on user ip. All tables have been named 'GeoData_' plus a convenient countryCode suffix (IT, FR, US...). Moreover, as they all contain the same fields, they inherit from the same 'GeoData' interface.

I know I can get needed dbset in the controller this way:

string countryTable = "GeoData_" + Server.HtmlEncode(Request.Cookies["_country"].Value.ToUpper());

        var type = Assembly.GetExecutingAssembly()
                .GetTypes()
                .FirstOrDefault(t => t.Name == countryTable);

        DbSet GeoContext = db.Set(type);

Now, I simply cannot pass this DbSet as I was used before, that is

var searchResult = GeoContext
                    .Where(c => c.PlaceName.ToUpper().Contains(term.ToUpper()))
                    .Select(c => new
                    {
                        PlaceName = c.PlaceName,
                        PostalCode = c.PostalCode,
                        GeoDataID = c.ID,
                        Latitude = c.Latitude,
                        Longitude = c.Longitude
                    }
                    )
                    .Distinct()
                    .OrderBy(c => (c.PlaceName.ToUpper().IndexOf(term.ToUpper())))
                    .ToList();

because model's fields (c.Placename etc...) can no more be referenced to GeoContext.

I suppose one way could be using System.Linq.Dynamic and changing the entire query consequently. Is there a way to take advantage of all tables inheriting from same interface to get a better workaround?

Answer 1

try defining the DbSet class explicitly like

DbSet<Class> GeoContext = db.Set<Class>(type);

i`m guessing you have this Class defined somewhere in your code