Singleton .NET Core - Main Transient

MainTransient.cs

var serviceProvider = new ServiceCollection()
    .AddTransient<ImageStore>((ctx) =>
    {
        var imageStore = new ImageStore();
        for (int i = 0; i < 10; i++) imageStore.AddImage($"image_{i}", File.ReadAllBytes("potato.png"));
        return imageStore;
    })
    .BuildServiceProvider();