I’m writing my first application using minimal APIs in a .NET 8 application. I’m following a training exercise I found on Microsoft Learn, and I’m using a database I designed. I ran into this error:

CS0311 The type ‘Show1’ cannot be used as type parameter
‘TImplementation’ in the generic type or method
‘ServiceCollectionServiceExtensions.AddScoped<TService,
TImplementation>(IServiceCollection)’. There is no implicit reference
conversion from ‘Show1’ to ‘BlazorMediaLibrary.API.Interfaces.IShow1’

I searched this error and came up with Why does a generic type constraint result in a no implicit reference conversion error? here on SO. However, I don’t think this fits my situation. Here’s what I got for my Interface, which was generated when I scaffolded the database to create the model classes and DbContext:

public interface IShow1
{
    int ShowId { get; set; }
    int ShowCode { get; set; }
    string EpisodeName { get; set; }
    string? Synopsis { get; set; }
    DateTime? DateLastViewed { get; set; }
    DateTime? OriginalBroadcastDate { get; set; }
    TimeOnly? PlayTime { get; set; }
    double? Rating { get; set; }

    TypeOfShow1 ShowCodeNavigation { get; set; }
    ICollection<Entries2> Entries2s { get; set; }
    ICollection<UserRating> UserRatings { get; set; }
}

and here’s the model class implementation:

public partial class Show1 : IShow1
{
    public int ShowId { get; set; }

    public int ShowCode { get; set; }

    public string EpisodeName { get; set; } = null!;

    public string? Synopsis { get; set; }

    public DateTime? DateLastViewed { get; set; }

    public DateTime? OriginalBroadcastDate { get; set; }

    public TimeOnly? PlayTime { get; set; }

    public double? Rating { get; set; }

    public virtual TypeOfShow1 ShowCodeNavigation { get; set; } = null!;
    public virtual ICollection<Entries2> Entries2s { get; set; } = new List<Entries2>();
    public virtual ICollection<UserRating> UserRatings { get; set; } = new List<UserRating>();
}

In the Program.cs file I defined this record:

internal record Show1(int ShowId, int ShowCode, string EpisodeName, string? Synopsis, DateTime? DateLastViewed, DateTime? OriginalBoardcastDate, TimeOnly? PlayTime, float? Rating);

And here’s the line in Program.cs which is raising the error:

builder.Services.AddScoped<IShow1, Show1>();

I didn’t include ShowCodeNavigation, Entries2, or UserRatings in the record definition in Program.cs. Is that what’s causing my problem?