I am working on an mvc .net application. When I run dotnet build the solution is built normally with no errors. However, when I run the solution to display the api using swagger, it throws a system aggregated exception and the run fails. The exception is being thrown at a certain part in my Program.cs file.
The Program.cs file looks something like this:
using Example.Api.Data;
using Example.Services;
using Example.Services.Interfaces;
using Example.Core;
using Example.Core.Interfaces;
using Example.Core.Repositories;
using Microsoft.AspNetCore.Identity;
using Microsoft.EntityFrameworkCore;
using Microsoft.OpenApi.Models;
using Swashbuckle.AspNetCore.Swagger;
using Swashbuckle.AspNetCore.SwaggerUI;
var builder = WebApplication.CreateBuilder(args);
// Add services to the container.
var connectionString = builder.Configuration.GetConnectionString("DefaultConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
options.UseSqlServer(connectionString));
builder.Services.AddDatabaseDeveloperPageExceptionFilter();
builder.Services.AddDefaultIdentity<IdentityUser>(options => options.SignIn.RequireConfirmedAccount = true)
.AddEntityFrameworkStores<ApplicationDbContext>();
builder.Services.AddAutoMapper(typeof(StartupBase));
builder.Services.AddControllersWithViews();
builder.Services.AddScoped<IUnitOfWork, UnitOfWork>();
builder.Services.AddTransient<IApplicantService, ApplicantService>();
builder.Services.AddTransient<IApplicantSurveyChoicesService, ApplicantSurveyChoicesService>();
builder.Services.AddTransient<IApplicantSurveyService, ApplicantSurveyService>();
builder.Services.AddTransient<IChoiceService,ChoiceService>();
//I basically did add transient for everyone of my services
builder.Services.AddSwaggerGen();
var app = builder.Build(); //this is where the exception is being thrown
// Configure the HTTP request pipeline.
if (app.Environment.IsDevelopment())
{
app.UseMigrationsEndPoint();
/*app.UseSwagger();
app.UseSwaggerUI();*/
}
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.UseSwagger();
app.UseSwaggerUI(options =>
{
options.SwaggerEndpoint("/swagger/v1/swagger.json", "v1");
options.RoutePrefix = string.Empty;
});
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.MapControllerRoute(
name: "default",
pattern: "{controller=Home}/{action=Index}/{id?}");
app.MapRazorPages();
app.Run();
It throws the following exception: 'System.AggregateException' in Microsoft.Extensions.DependencyInjection.dll
Message=Some services are not able to be constructed (Error while validating the service descriptor 'ServiceType: Example.Services.Interfaces.IApplicantService Lifetime: Transient ImplementationType: Example.Services.ApplicantService': Unable to resolve service for type 'Example.Core.Interfaces.IUnitOfWork' while attempting to activate 'Example.Services.ApplicantService'.)
and the error appears for every single time I call AddTransient
I am fairly new to the dotnet framework and I am still a beginner and would appreciate your help!
The IUnitOfWork file consists of the following:
public interface IUnitOfWork : IDisposable
{
IApplicantRepository Applicants { get; }
IApplicantSurveyChoicesRepository ApplicantSurveyChoices { get; }
IApplicantSurveyRepository ApplicantSurveys { get; }
IChoiceRepository Choices{ get; }
Task<int> CommitAsync();
}
The UnitOfWork class is just an implementation of the interface as such:
public UnitOfWork(DbContext context)
{
this._context = context;
}
public UnitOfWork(DbContext context, DbContext context1, IHostingEnvironment _environment, IHttpContextAccessor httpContextAccessor)
{
this._context = context;
this._environment = _environment;
_httpContextAccessor = httpContextAccessor;
}
public IApplicantRepository Applicants => _applicantRepository = _applicantRepository ?? new ApplicantRepository(_context, Config, _httpContextAccessor);
public IApplicantSurveyChoicesRepository ApplicantSurveyChoices => _applicantsurveychoicesrepository = _applicantsurveychoicesrepository ?? new ApplicantSurveyChoicesRepository(_context, Config, _httpContextAccessor);
public IApplicantSurveyRepository ApplicantSurveys => _applicantsurveysrepository = _applicantsurveysrepository ?? new ApplicantSurveyRepository(_context, Config, _httpContextAccessor);
public IChoiceRepository Choices => _choicerepository = _choicerepository ?? new ChoiceRepository(_context, Config, _httpContextAccessor);
public async Task<int> CommitAsync()
{
return await _context.SaveChangesAsync();
}
public void Dispose()
{
_context.Dispose();
}
IdsAcademyContext, but I don't see that in your Program.cs. Do you need to add it?