Bonjour,
Je débute avec ASP NET CORE MVC, j'ai choisi l'approche code first pour mon projet et j'ai suivis un tutoriel.
J'ai une classe BddContext.cs:
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Madera.Models;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using MySQL.Data.EntityFrameworkCore;
namespace Madera.Context
    public class BddContext : DbContext
        public static string ConnectionString { get; set; }
        public static IConfigurationRoot Configuration { get; set; }
        public DbSet<Person> Persons { get; set; }
        public DbSet<Employee> Employees { get; set; }
        public DbSet<Client> Clients { get; set; }
        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
            optionsBuilder.UseMySQL(@ConnectionString);
J'ai créé des modèles pour l'exemple : 

	
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namespace Madera.Models
    public class Person
        public int ID { get; set; }
        public string LastName { get; set; }
        public string FirstName { get; set; }
        public string Email { get; set; }
        public string Address { get; set; }
        public string PostalCode { get; set; }
        public string City { get; set; }
        public string Country { get; set; }
        public string Phone { get; set; }
    public class Client : Person
        public int ID { get; set; }
        public int ClientNumber { get; set; }
    public class Employee : Person
        public int ID { get; set; }
        public string WorkPlace { get; set; }
        public string Function { get; set; }
        public string SocialSecurityNumber { get; set; }
    public class User
        public User(Employee pEmployee)
            this.Employee = pEmployee;
        public int ID { get; set; }
        public string Login { get; set; }
        public string Password { get; set; }
        public Employee Employee { get; set; }
J'ai par la suite généré des vues et un contrôleur via mon modèle "client" en utilisant les fonctionnalité de l'IDE Visual Studio.

Statup.cs :

	
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Madera.Context;
using Madera.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.EntityFrameworkCore;
using MySQL.Data.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
namespace Madera
    public class Startup
        public Startup(IConfiguration configuration)
            Configuration = configuration;
        public IConfiguration Configuration { get; }
        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
            services.AddMvc();
            BddContext.ConnectionString = Configuration.GetConnectionString("MaderaBDD");
        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
            if (env.IsDevelopment())
                app.UseDeveloperExceptionPage();
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseRouting();
            app.UseAuthorization();
            app.UseEndpoints(endpoints =>
                endpoints.MapControllerRoute(
                    name: "default",
                    pattern: "{controller=Home}/{action=Index}/{id?}");
            });
Program.cs :

	
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Madera.Context;
using Madera.Models;
using Microsoft.AspNetCore.Hosting;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.Hosting;
using Microsoft.Extensions.Logging;
namespace Madera
    public class Program
        public static void Main(string[] args)
            CreateHostBuilder(args).Build().Run();
        public static IHostBuilder CreateHostBuilder(string[] args) =>
            Host.CreateDefaultBuilder(args)
                .ConfigureWebHostDefaults(webBuilder =>
                    webBuilder.UseStartup<Startup>();
                });
Mais quand j'essaie d’accéder au lien: https://localhost:44353/Clients j'ai l'erreur suivante:

				System.InvalidOperationException: Unable to resolve service for type 'Madera.Context.BddContext' while attempting to activate 'Madera.Controllers.ClientsController'.

   at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)

   at lambda_method(Closure , IServiceProvider , Object[] )

   at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.<CreateActivator>b__0(ControllerContext controllerContext)

   at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.<CreateControllerFactory>g__CreateController|0(ControllerContext controllerContext)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeNextResourceFilter>g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()

--- End of stack trace from previous location where exception was thrown ---

   at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.<InvokeAsync>g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)

   at Microsoft.AspNetCore.Routing.EndpointMiddleware.<Invoke>g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)

   at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)

   at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)
		
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