Ensure that Httpconfiguration.Ensureinitialized()

Question

Goodnight!

I’m studying about ASP.NET (I come from java) and I’m a little confused by all this.

I am trying to create an endpoint to return the client list of my database, however, I can not in any way initialize it!

When I run the project, it returns the following error

exceptionMessage":"The object has not yet been initialized. Ensure that HttpConfiguration.EnsureInitialized() is called in the application's startup

According to the examples I found, it’s all OK, I can’t find anything to help me with the error in question.

I would also like, if anyone knows any source of examples or tutorials, how to create an interface to interact between controller and bank actions!

Below are the project classes

Webconfig.Cs

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        config.MapHttpAttributeRoutes();

        config.Routes.MapHttpRoute(
            name: "DefaultApi",
            routeTemplate: "api/{controller}/{id}",
            defaults: new { id = RouteParameter.Optional }
        );

        var jsonFormatter = config.Formatters.OfType<JsonMediaTypeFormatter>().First();
        jsonFormatter.SerializerSettings.ContractResolver = new CamelCasePropertyNamesContractResolver();
    }
}

Clientecontroller

public class ClienteController : ApiController
{
    DbContext db = new DbContext();

    [HttpGet]
    [AllowAnonymous]
    [Route("/{id:guid}", Name = "GetClientes")]
    public IHttpActionResult GetClientes(int? id)
    {
        return Ok(this.db.clientes.Where(c => c.usuarioId == id).ToList());
    }

    [HttpGet]
    [AllowAnonymous]
    [Route("/id/{id:guid}", Name = "GetClienteById")]
    public IHttpActionResult GetClienteById(int? id)
    {
        if (id == null)
        {
            ModelState.AddModelError("", "A Identificação do cliente é obrigatória.");
            return BadRequest(ModelState);
        }

        return Ok(this.db.clientes.FindAsync(id));
    }
}

Dbcontext

[DbConfigurationType(typeof(MySql.Data.Entity.MySqlEFConfiguration))]
public class DbContext : System.Data.Entity.DbContext
{
    public DbContext()
        : base("ResourceContext")
    {
        Configuration.ProxyCreationEnabled = false;
        Configuration.LazyLoadingEnabled = false;
    }

    public static DbContext Create()
    {
        return new DbContext();
    }

    public DbSet<Cliente> clientes { get; set; }
}

Customer.Cs

public class Cliente
{
    [Key]
    public int Id { get; set; }

    [Required] 
    public int usuarioId { get; set; } //Foreign Key

    [Required]
    [Display(Name = "Nome do Cliente")]
    [MaxLength(200)]
    public string Nome { get; set; }

    [DataType(DataType.Date)]
    [Display(Name = "Data de Nascimento")]
    public DateTime dataNascimento { get; set; }

    [MaxLength(100)]
    public string email { get; set; }

    [MaxLength(200)]
    public string endereco { get; set; }

    [MaxLength(13)]
    public string telefone { get; set; }

    [Required]
    [MaxLength(14)]
    public string celular { get; set; }

    [Required]
    [DataType(DataType.Date)]
    [Display(Name = "Data de Cadastro")]
    public DateTime dataCadastro { get; set; }

    [Required]
    public bool ativo { get; set; }

}

Startup.Cs

public class Startup
{
    public void Configuration(IAppBuilder app)
    {
        HttpConfiguration config = new HttpConfiguration();

        ConfigureOAuth(app);

        WebApiConfig.Register(config);
        app.UseCors(Microsoft.Owin.Cors.CorsOptions.AllowAll);
        app.UseWebApi(config);
    }

    private void ConfigureOAuth(IAppBuilder app)
    {
        //Token Consumption
        app.CreatePerOwinContext(DbContext.Create);
        app.UseOAuthBearerAuthentication(new OAuthBearerAuthenticationOptions());
    }
}

Answer 1

The most important file is missing: Global.asax.cs.

Anyway, this is a classic Web API error. In Web API 2, the global configuration record has changed shape. In the file Global.asax.cs root directory, event Application_Start, change:

WebApiConfig.Register(GlobalConfiguration.Configuration);

For:

GlobalConfiguration.Configure(WebApiConfig.Register);

You can also, optionally, force the following execution as the last line of the Application_Start:

GlobalConfiguration.Configuration.EnsureInitialized();