LINQ select on a SQL View gets wrong answer

Question

I have a SQL View that produces a response with 8 columns. Its a rather complicated so I won\'t list it here and it won\'t add much to the issue I\'m trying to understand.

Answer 1

Your problem is similar to this: Using a view with no primary key with Entity

Specify keys that makes your row unique. You can specify those keys on your entity mapping via attributes:

public class YearlySalesOnEachCountry
{        
    [Key, Column(Order=0)] public int CountryId { get; set; }
    public string CountryName { get; set; }
    [Key, Column(Order=1)] public int OrYear { get; set; }

    public long SalesCount { get; set; }      
    public decimal TotalSales { get; set; }
}

Or you can do it via code approach:

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    base.OnModelCreating(modelBuilder);    
    modelBuilder.Entity()
           .HasKey(x => new { x.CountryId, x.OrYear });     
}