So I am trying to implement my IoC that linked my DBContext class as a Dependency Injection as a ServiceProvider.
I am getting this error when it comes to starting my ASP Core app So my question is; What am i doing wrong, i tried googling it but i can't really find a solution that way. I tried asking some of the more elite programmers on my campus but they haven ot specifically worked with ASPnet Core so they don't know if it's because of my casting or because of ASPnet Core
Application startup exception: System.InvalidCastException: Unable to cast object of type 'Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope' to type 'Microsoft.Extensions.DependencyInjection.ServiceProvider'. at Spackk.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider) in F:\Developement\SpackkMVC\Spackk\Spackk\Startup.cs:line 44 --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app) at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder app) at Microsoft.AspNetCore.Hosting.Internal.AutoRequestServicesStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication() crit: Microsoft.AspNetCore.Hosting.Internal.WebHost[6] Application startup exception System.InvalidCastException: Unable to cast object of type 'Microsoft.Extensions.DependencyInjection.ServiceLookup.ServiceProviderEngineScope' to type 'Microsoft.Extensions.DependencyInjection.ServiceProvider'. at Spackk.Startup.Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider) in F:\Developement\SpackkMVC\Spackk\Spackk\Startup.cs:line 44 --- End of stack trace from previous location where exception was thrown --- at Microsoft.AspNetCore.Hosting.ConventionBasedStartup.Configure(IApplicationBuilder app) at Microsoft.AspNetCore.HostFilteringStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder app) at Microsoft.AspNetCore.Hosting.Internal.AutoRequestServicesStartupFilter.<>c__DisplayClass0_0.b__0(IApplicationBuilder builder) at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()
This is how the code looks in Startup
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using System;
namespace Spackk
{
public class Startup
{
private readonly string UserGuid = Guid.NewGuid().ToString();
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)
{
//add ApplicationDbContext to DI
services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer("Server=.;Database=SpackkDB;Trusted_Connection;MultipleActiveResultSets=true"));
services.Configure<CookiePolicyOptions>(options =>
{
// This lambda determines whether user consent for non-essential cookies is needed for a given request.
options.CheckConsentNeeded = context => true;
options.MinimumSameSitePolicy = SameSiteMode.None;
});
services.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
}
// This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
public void Configure(IApplicationBuilder app, IHostingEnvironment env, IServiceProvider serviceProvider)
{
//Store isntance of the DI Service provider so our application can access iot anywhere
IocContainer.Provider = (ServiceProvider)serviceProvider;
if (env.IsDevelopment())
{
app.UseDeveloperExceptionPage();
}
else
{
app.UseExceptionHandler("/Home/Error");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseCookiePolicy();
app.UseMvc(routes =>
{
routes.MapRoute(
name: "default",
template: "{controller=Home}/{action=Index}/{id?}");
});
}
}
}
This is where the the class where the error is happening;
For context i will also provide the IoC/IoCContainer/ApplicationDbContext and the model;
using System.ComponentModel.DataAnnotations;
namespace Spackk.Models
{
public class UserModel
{
[Key]
public string Id { get; set; }
[Required]
[MaxLength(255)]
[Display(Name = "UserName")]
public string Username { get; set; }
[Required]
[MaxLength(255)]
[Display(Name = "DisplayName")]
public string DisplayName { get; set; }
[Required]
[MaxLength(255)]
[DataType(DataType.Password)]
[Display(Name = "Password")]
public string Password { get; set; }
[Required]
[MaxLength(255)]
[DataType(DataType.EmailAddress)]
[Display(Name = "Email")]
public string Email { get; set; }
}
}
ApplicationDbContext
using Microsoft.EntityFrameworkCore;
using Spackk.Models;
using System;
using System.Linq;
namespace Spackk
{
public class ApplicationDbContext : DbContext
{
public string Id { get; set; } = Guid.NewGuid().ToString("N");
public DbSet<UserModel> Users { get; set; }
/// <summary>
///
/// </summary>
/// <param name="options"></param>
public ApplicationDbContext(DbContextOptions<ApplicationDbContext> options) : base(options)
{
}
protected override void OnModelCreating(ModelBuilder mBuilder)
{
base.OnModelCreating(mBuilder);
mBuilder.Entity<UserModel>().HasIndex(a => a.DisplayName);
}
}
}
IoC/IoCContainer
using Microsoft.Extensions.DependencyInjection;
namespace Spackk
{
public class IoC
{
/// <summary>
/// The scoped instance of the <see cref="ApplicationDbContext()"/>
/// </summary>
public static ApplicationDbContext ApplicationDbContext => IocContainer.Provider.GetService<ApplicationDbContext>();
}
/// <summary>
/// the dependenc injection container making use of the built in .Net Core service provider
/// </summary>
public class IocContainer
{
/// <summary>
/// the service provider for the is application
/// </summary>
public static ServiceProvider Provider { get; set; }
}
}
