DbContext.set() cannot create a DbSet for entity because this type is not included in the model for the context - asp.net-core

Question

I am using EF Core. I am using DbContext.Set() method but it is giving me the error - "Cannot create a DbSet for 'MediaDate' because this type is not included in the model for the context.'"
Below is my code:
var context = new GoldentaurusContext();
DbSet<MediaDate> set = context.Set<MediaDate>();
mediaDateList = set.FromSql("[dbo].[sp_GetMediaDate]")
.Select(x => new SelectListItem { Text = x.DateText, Value = x.DateValue })
.ToList();
The MediaDate class:
public class MediaDate
{
public string DateText { get; set; }
public string DateValue { get; set; }
}
Why it is requiring me to add the MediaDate class to the DbContext class?
Please help what I am doing wrong?

Answer 1

Your DB Context class should be like below.
public partial class DatabaseContext : DbContext
{
public DatabaseContext (string ConnectionString) : base(new DbContextOptionsBuilder().UseSqlServer(ConnectionString).Options)
{
}
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Query<MediaData>();
}
Add your models in the DatabaseContext using model builder.
This is how I have resolved this isssue

Answer 2

For EF in DotNet Core 3.1+ make sure you add your non-table entity to the OnModelCreating override on your DbContext and call .HasNoKey() on the fluent API. This will allow you to call a stored procedure using DataContext.Set<MediaData>().FromSqlRaw("dbo.MyStoredProc") and return your entity list.
protected override void OnModelCreating(ModelBuilder modelBuilder)
{
base.OnModelCreating(modelBuilder);
modelBuilder.Entity<MediaData>().HasNoKey();
}

Answer 3

A simple DatabaseContext would look like this:
using YourProject.Model;
using System.Data.Entity;
namespace YourProject.Data
{
public class DatabaseContext : DbContext
{
public DatabaseContext() :
base("name=YourDatabase")
{
}
public DbSet<MediaData> MediaDates{ get; set; }
}
}
You always need to include your models in the DatabaseContext to create the DbSets. Make sure you've declared the right namespaces and imported the right ones.

Answer 4

First, you should introduce your model (MediaDate) to DbContext.
add a DbSet<MediaDate> property to your context:
public class ApplicationDbContext : DbContext
{
public ApplicationDbContext()
: base("DefaultConnection")
{
}
public DbSet<MediaDate> MediaDates { get; set; }
}