Entity Framework Core Lazy

 - installer le package Microsoft.EntityFrameworkCore.Proxies

- dans le dbcontext

private readonly string _connexionString;

        public SqlServerContext(string connexionString)

        {

            _connexionString = connexionString;

        }

- dans le dbcontext.OnConfiguring

string myConnectionString = "data source=(LocalDB)\\MSSQLLocalDB;attachdbfilename=C:\\ADI\\DEV_LORO\\CSHARP\\SLN_FACTURE2018\\DATABASE\\FACTURE.MDF;integrated security=True;connect timeout=30;";

            optionsBuilder

        .UseLazyLoadingProxies()

        .UseSqlServer(myConnectionString);

et commenter le reste

https://docs.microsoft.com/en-us/ef/core/querying/related-data/lazy