Cast an object to an array of string?

Question

I have this code:

Strutture = from Ricettivito s in Strutture
            where s.ServiziAttivi.Cast<string>().Intersect(IDSServizi).Count() == IDSServizi.Count()
            select s;

I need to:

Cast ServiziAttivi (which is a list of MyService) into a list of string (which must contains MyService.UniqueID)
Than, check if this list contains each elements of IDSServizi (which is a list of string).

But seems I cannot doint that conversion?

Only you can tell us why you can't do that conversion - what's the error message? — J. Steen
– J. Steen, Commented Apr 17, 2013 at 14:20
Unable to cast object of type 'Ricettivita.MyService' to type 'System.String'. — markzzz
– markzzz, Commented Apr 17, 2013 at 14:20
I need to extract Ricettivito which ServiziAttivi that contains each values inside IDSServizi — markzzz
– markzzz, Commented Apr 17, 2013 at 14:22
Rather than casting, try .Select-ing the UniqueID from the ServiziAttivi-list. — J. Steen
– J. Steen, Commented Apr 17, 2013 at 14:22

I4V · Accepted Answer · 2013-04-17 14:27:41Z

4

First cast to .Cast<Ricettivita.MyService>() then select a string property.

    where s.ServiziAttivi
             .Cast<Ricettivita.MyService>()
             .Select(x=>x.UniqueID).Intersect(IDSServizi).Count()

answered Apr 17, 2013 at 14:27

I4V

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1 Comment

J. Steen Over a year ago

If OP did a .ToList() would they need a cast, first? Assuming OPs custom collection class inherits from Enumerable in some way.

MarcinJuraszek · Accepted Answer · 2013-04-17 14:22:42Z

1

I think you should use Select instead of Cast:

Strutture = from Ricettivito s in Strutture
            where s.ServiziAttivi.Select(x => (string)x.UniqueID).Intersect(IDSServizi).Count() == IDSServizi.Count()
            select s;

answered Apr 17, 2013 at 14:22

MarcinJuraszek

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1 Comment

markzzz Over a year ago

I can't. Check the answer to @Michael Perrenoud

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