[D�butant] Code First: InvalidOperationException: Unable to resolve service

Bonjour,

Je d�bute 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 cr�� des mod�les 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 g�n�r� des vues et un contr�leur via mon mod�le "client" en utilisant les fonctionnalit� 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();
            }
            else
            {
                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�acc�der au lien: https://localhost:44353/Clients j'ai l'erreur suivante:

Citation:

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)