Web api 500 internal server error

GlobalConfiguration.Configuration.IncludeErrorDetailPolicy = 
    IncludeErrorDetailPolicy.Always;

public class NotImplExceptionFilter : ExceptionFilterAttribute {
  public override void OnException(HttpActionExecutedContext context) {
     if (context.Exception is NotImplementedException) {
       context.Response = new HttpResponseMessage(HttpStatusCode.NotImplemented);
    }
  }
}

9

ObjectContent<IEnumerable<Product>> responseContent = new ObjectContent<IEnumerable<Product>>(db.Products.Include(p => p.ProductSubcategory).AsEnumerable(), new XmlMediaTypeFormatter()); // change the formatters accordingly

            MemoryStream ms = new MemoryStream();

            // This line would cause the formatter's WriteToStream method to be invoked.
            // Any exceptions during WriteToStream would be thrown as part of this call
            responseContent.CopyToAsync(ms).Wait();

3

0

    public class RouteConfig
{
    public static void RegisterRoutes(RouteCollection routes)
    {
        routes.IgnoreRoute("{resource}.axd/{*pathInfo}");

        // Default is required in any case.
        routes.MapRoute(
            name: "Default",
            url: "{controller}/{action}/{id}",
            defaults: new { controller = "Home", action = "Index", id = UrlParameter.Optional }
        );
    }
}

2

0

Fredrik Normén wrote a great blog post called ASP.NET Web API Exception Handling about that topic. His solution uses custom exception classes and an exception filter attribute that can be applied to all ApiController action methods.

Answers

• User475983607 posted

  Below is a working demo loosely based on your examples code and intended to highlight where you desing is incorrect.

  using ApiDemo.Models;
  using System.Collections.Generic;
  using System.Web.Http;
  
  namespace ApiDemo.Controllers
  {
      public class ContactApiController : ApiController
      {
          private readonly List<ContactUs> db;
          public ContactApiController()
          {          
              db = new List<ContactUs>()
              {
                  new ContactUs()
                  {
                      Email = "Hello@World.com",
                      FirstName = "Hello",
                      LastName = "World",
                      MobilePhone = "(123) 467-7891"
                  },
                  new ContactUs()
                  {
                      Email = "Goo@bar.com",
                      FirstName = "Foo",
                      LastName = "Bar",
                      MobilePhone = "(111) 222-3333"
                  }
              };
          }
  
          [HttpGet]
          public IHttpActionResult Get()
          {
              return Ok(db);
          }
  
          [HttpPost]
          public IHttpActionResult Post(ContactUs contactUs)
          {
              //Identify the Action
              contactUs.FirstName = "HTTP POST Conventional Routing";
              contactUs.LastName = "/Api/ContactApi";
              return Ok(contactUs);
          }
  
          [HttpPost]
          [Route("ContactUs", Name = "ContactUs")]
          public IHttpActionResult ContactUs(ContactUs contactUs)
          {
              //Identify the Action
              contactUs.FirstName = "HTTP POST Route Attribute";
              contactUs.LastName = "/Api/ContactApi/ContactUs";
              return Ok(contactUs);
          }
      }
  }
  

  Client

  using System;
  using System.Net;
  using System.Net.Http;
  using System.Net.Http.Headers;
  using System.Threading.Tasks;
  
  
  namespace CsConsole
  {
      class Program
      {
          static HttpClient client = new HttpClient();
          static void Main(string[] args)
          {
              client.BaseAddress = new Uri("https://localhost:44371");
              client.DefaultRequestHeaders.Accept.Clear();
              client.DefaultRequestHeaders.Accept.Add( new MediaTypeWithQualityHeaderValue("application/json"));
  
              ContactUs contactUs = new ContactUs()
              {
                  Email = "email@email.com",
                  FirstName = "Hello",
                  LastName = "World",
                  MobilePhone = "(123) 456-7891"
              };
  
              ContactUs response = PostData("api/ContactApi", contactUs).GetAwaiter().GetResult();
              Console.WriteLine($"{response.FirstName}rn{response.LastName}rn{response.Email}rn{response.MobilePhone}");
              Console.WriteLine();
              response = PostData("api/ContactApi/ContactUs", contactUs).GetAwaiter().GetResult();
              Console.WriteLine($"{response.FirstName}rn{response.LastName}rn{response.Email}rn{response.MobilePhone}");
          }
  
             
          public static async Task<ContactUs> PostData(string Url, ContactUs contactUs)
          {
              HttpResponseMessage response = await client.PostAsJsonAsync("api/ContactApi", contactUs);
              response.EnsureSuccessStatusCode();
  
              if (response.IsSuccessStatusCode)
              {
                  return await response.Content.ReadAsAsync<ContactUs>();
              }
              return null;
          }
  
      }
      public class ContactUs
      {
          public string FirstName { get; set; }
          public string LastName { get; set; }
          public string Email { get; set; }
          public string MobilePhone { get; set; }
      }
  }
  

  There are several issues with your original code that you should be able to fix by reading the official docs below.  Web API 2 is a RESTful framework where Actions are filtered by the HTTP methods; GET POST, PUT, and DELETE.  Not by the action
  name.  Use route attributes if you want to include the Action in the URL.

  https://docs.microsoft.com/en-us/aspnet/web-api/overview/getting-started-with-aspnet-web-api/tutorial-your-first-web-api

  https://docs.microsoft.com/en-us/aspnet/web-api/overview/advanced/calling-a-web-api-from-a-net-client

  • Marked as answer by

    Thursday, October 7, 2021 12:00 AM