Converting SQL query result to Linq result with an new field that is not in the Model - sql

Question

I have an SQL query,
SELECT
c.AssignedTo ,c.CampaignID, c.Name, c.Venue,c.StartedOn,
c.CompletedOn, c.IsOpen, COUNT(C.Name) AS Leads
FROM
Campaign AS c
RIGHT JOIN
Leads AS l ON l.CampaignID = c.CampaignID
GROUP BY
c.AssignedTo, c.CampaignID, c.Name,c.Venue,c.StartedOn, c.CompletedOn, c.IsOpen
ORDER BY
c.AssignedTo
These are my two tables in that query, CAMPAIGNS:
[Table("Campaigns")]
public class Campaigns
{
[Key]
public int CampaignID { get; set; }
[MaxLength(30)]
public string Name { get; set; }
[MaxLength(200)]
public string Venue { get; set; }
[ForeignKey("UsersReference")]
public int AssignedTo { get; set; }
public DateTime StartedOn { get; set; }
public DateTime? CompletedOn { get; set; }
public bool IsOpen { get; set; }
// To Reference Users table using FK
public Users UsersReference { get; set; }
}
and Leads:
[Table("Leads")]
public class Leads
{
[Key]
public int LeadID { get; set; }
[ForeignKey("CampaignsReference")]
public int CampaignID { get; set; }
[MaxLength(30)]
public string ConsumerName { get; set; }
[MaxLength(30)]
public string EmailAddress { get; set; }
[MaxLength(10)]
public string PhoneNo { get; set; }
public string PreferredMoC { get; set; }
public DateTime DateApproached { get; set; }
[ForeignKey("ProductsReference")]
public int ProductID { get; set; }
public string Status { get; set; }
// To access Campaign and Product table through FK
public Campaigns CampaignsReference { get; set; }
public Products ProductsReference { get; set; }
}
My query returns a result likes this in SQL:
The Leads column is just the COUNT() of the columns matching with my CampaignID. I've used context.Campaigns.FromSqlRaw() but since my Campaigns doesn't have another column specifically for the count.
Is there a way to display my new field Count() using EF Core and Linq?

Answer 1

Use LINQ Query for such task.
var query =
from l in ctx.Leads
let c = l.CampaignsReference
group c by new { c.AssignedTo, c.CampaignID, c.Name, c.Venue, c.StartedOn, c.CompletedOn, c.IsOpen } into g
select new
{
g.Key.AssignedTo,
g.Key.CampaignID,
g.Key.Name,
g.Key.Venue,
g.Key.StartedOn,
g.Key.CompletedOn,
g.Key.IsOpen,
Leads = g.Sum(x => x.Name != null ? 1 : 0)
};
var query = query.OrderBy(x => x.AssignedTo);