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Erro ao criar o ambiente Development

Referente ao curso Asp.NET Core: uma webapp usando o padrão MVC, no capítulo Transformando a aplicação em um servidor web e atividade Para saber mais: configurando ambientes diferentes

por Genilson de Maceno
| 37.9k xp | 11 posts

Ao tentar criar um ambiente web de desenvolvimento ocorreu a seguinte falha no console:

     static void Main(string[] args)
    {
        var _repo = new LivroRepositorioCSV();

        IWebHost host = new WebHostBuilder()
            .UseKestrel()  
            .UseStartup<StartupDevelopment>() 
            .Build();
             host.Run();


        //ImprimeLista(_repo.ParaLer);
        //ImprimeLista(_repo.Lendo);
        //ImprimeLista(_repo.Lidos);
    }


public class StartupDevelopment
{
    public void ConfigureDevelopment(IApplicationBuilder app)
    {
        app.Run(LivrosParaLer);
    }

    public Task LivrosParaLer(HttpContext context)
    {
        //HttpContext contexto = new HttpContext(); // toda informação http é incapsulada dessa classe
        var _repo = new LivroRepositorioCSV();


        return context.Response.WriteAsync(_repo.ParaLer.ToString()); // para escrever            
    }
}

**Application startup exception: System.InvalidOperationException: A public method named 'ConfigureProduction' or 'Configure' could not be found in the 'Alura.ListaLeitura.App.StartupDevelopment' type. at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.FindMethod(Type startupType, String methodName, String environmentName, Type returnType, Boolean required) at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.FindConfigureDelegate(Type startupType, String environmentName) at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.LoadMethods(IServiceProvider hostingServiceProvider, Type startupType, String environmentName) at Microsoft.AspNetCore.Hosting.WebHostBuilderExtensions.<>c__DisplayClass1_0.b__1(IServiceProvider sp) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureStartup() at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication()

Unhandled Exception: System.InvalidOperationException: A public method named 'ConfigureProduction' or 'Configure' could not be found in the 'Alura.ListaLeitura.App.StartupDevelopment' type. at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.FindMethod(Type startupType, String methodName, String environmentName, Type returnType, Boolean required) at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.FindConfigureDelegate(Type startupType, String environmentName) at Microsoft.AspNetCore.Hosting.Internal.StartupLoader.LoadMethods(IServiceProvider hostingServiceProvider, Type startupType, String environmentName) at Microsoft.AspNetCore.Hosting.WebHostBuilderExtensions.<>c__DisplayClass1_0.b__1(IServiceProvider sp) at Microsoft.Extensions.DependencyInjection.ServiceLookup.CallSiteRuntimeResolver.VisitScoped(ScopedCallSite scopedCallSite, ServiceProvider provider) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService(IServiceProvider provider, Type serviceType) at Microsoft.Extensions.DependencyInjection.ServiceProviderServiceExtensions.GetRequiredService[T](IServiceProvider provider) at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureStartup() at Microsoft.AspNetCore.Hosting.Internal.WebHost.EnsureApplicationServices() at Microsoft.AspNetCore.Hosting.Internal.WebHost.BuildApplication() at Microsoft.AspNetCore.Hosting.WebHostBuilder.Build() at Alura.ListaLeitura.App.Program.Main(String[] args) in C:\Users\genilson.maceno\Dropbox\C-Sharp\Asp.NET Core\Alura.ListaLeitura\Alura.ListaLeitura.App\Program.cs:line 14

O C:\Program Files\dotnet\dotnet.exe (processo 17028) foi encerrado com o código -532462766. Pressione qualquer tecla para fechar esta janela...**

1 resposta
por Ana de Jesus
| 919.3k xp | 1468 posts
Instrutor

Olá Genilson, como vai?

Sentimos muito pela demora em te retornar.

Pelo código que compartilhou, acredito que falte um método para roteamento do projeto.

public Task Roteamento(HttpContext context)
        {
            var repo = new LivroRepositorioCSV();
            var caminhoAtendido = new Dictionary<string, RequestDelegate>
            {
                { "/Livros/ParaLer", LivrosParaLer },                
            };

            if (caminhoAtendido.ContainsKey(context.Request.Path))
            {
                var metodoRequestDelegate = caminhoAtendido[context.Request.Path];
                return metodoRequestDelegate.Invoke(context);
            }

            context.Response.StatusCode = 404;
            return context.Response.WriteAsync("Caminho inexistente!");
        }

O método ConfigureDevelopment continua semelhante ao método da classe Startup, veja:

public void Configure(IApplicationBuilder app)
    {
        app.Run(Roteamento);
    }

Abraços e bons estudos!