If I got this list
PersonPhone
------------------------------------------------------------
| **PersonId** |**Name** | **PhoneId** | **PhoneNumber** |
------------------------------------------------------------
| 1 | John Doe | 1 | 111-55-5855 |
------------------------------------------------------------
| 1 | John Doe | 2 | 111-55-5521 |
------------------------------------------------------------
| 2 | Mary Jane| 3 | 254-565-855 |
------------------------------------------------------------
| 3 | J. Watson| NULL| NULL|
------------------------------------------------------------
I need to mapping to this object:
public class PersonContactInfo {
public int Id { get; set; }
public string Name { get; set; }
public List<string> Phones { get; set; }
}
With LINQ, how can I get one row for each person, with his phones in a List and paging?
I already have a query which result is like the PersonPhone result set, but I don't know how to grouping by PersonId and then join all the PhoneNumbers to List, and paging. For example, if I want a page size of three, how to make a sql query to get John Doe, Mary Jane and J. Watson with their phones, if the actual query returns 4 rows?
Note: I'm not (and can't) using Entity Framework, what I'm doing is and sql query that populate a list of PersonPhone , just like EF does.
Applying a group by
:
var query= PersonPhoneSet
.GroupBy(p=>new {p.PersonId, p.Name})
.Select(g=> new PersonContactInfo
{
Id=g.Key.PersonId,
Name=g.Key.Name,
Phones= g.Select(p=>p.PhoneNumber).ToList()
}
);
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