Receive Dictionary<int, string> from linq to entity? - entity-framework

Question

continuation of the issue How get array in linq to entity?
but now is not array => Dictionary
City type is Dictionary
var sites = (from country in db.Countries
select new
{
Country = country.Title,
Cities = country.Cities.Select(m => m.Title)
})
.AsEnumerable()
.Select(country => new SitiesViewByUser()
{
Country = country.Country,
City = country.Cities.ToArray()
});
update:
public class SitiesViewByUser
{
public string Country { get; set; }
public Dictionary<int, string> City { get; set; }
}

Answer 1

You can use ToDictionary to create a dictionary from a LINQ sequence.
The first part is the key, and the second the value, E.g.
.Select(country => new SitiesViewByUser()
{
Country = country.Country,
City = country.Cities.ToDictionary(c => c, c => c);
});
This assumes that City on SitiesViewByUser is defined as Dictionary<string, string>
Your LINQ is quite confusing though. You are creating an anonymous type, asssumed to shape a Country, but which has a Country property on it, which is infact the Title of the country (is that the name of the country?).
You also have a collection of just the city Titles, so I'm not sure what value you are going to use in your City dictionary on your SitiesViewByUser type.
Also, what is a Sitie? :\
Update
You could do something like this:
var countries = (from country in db.Countries
select new
{
Title = country.Title,
CityIds = country.Cities.Select(c => c.Id),
CityTitles = country.Cities.Select(c => c.Title)
}).AsEnumerable();
// You have a collection of anonymous types at this point,
// each type representing a country
// You could use a foreach loop to generate a collection
// of SitiesViewByUser, or you could use LINQ:
var sitiesViewByUsers = countries.Select(c => new SitiesViewByUser
{
Country = c.Title,
City = c.CityIds.Zip(c.CityTitles, (k, v) => new { Key = k, Value = v })
.ToDictionary(x => x.Key, x => x.Value)
};
Alternatively, why don't you change the SitiesViewByUser type to be:
public class SitiesViewByUser
{
public string Country { get; set; }
public IEnumerable<City> Cities { get; set; }
}
Then you can do (using fluent syntax):
var sitiesViewByUsers = db.Countries.Select(c => new SitiesViewByUser
{
Country = c.Title,
Cities = c.Cities
});