webapi 500 error code

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Manish Prajapati 4 posts 34 karma points

Jul 29, 2020 @ 13:45

Hi All,

I am trying to implemented a web api which will be consumed on front end. I am calling the api in the browser but getting the attached error.

enter image description here

I am posting my code :-

ISumService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyProject.Umbraco.Api
{
 public interface ISumService
 {
    int Sum(int x, int y);
 }}

SumService.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyProject.Umbraco.Api
{
    public class SumService : ISumService
   {

    private ISumService _sumService;

     public SumService(
        ISumService sumService)
    {
        _sumService = sumService;
    }
    public int Sum(int x, int y)
    {
        int sum = _sumService.Sum(x, y);
        return sum;
    }

 }
}

SumController.cs

 using System.Web.Http;
 using Umbraco.Web.WebApi;

namespace MyProject.Umbraco.Api
{
  public class SumController : UmbracoApiController
  {

    private ISumService _sumService;

    public SumController(ISumService sumService)
    {
        _sumService = sumService;

    }


    [HttpGet]
    public int GetSum()
    {
        return _sumService.Sum(10, 30);
    }

   }
  }

Compose.cs

 using Umbraco.Core.Composing;

 namespace MyProject.Umbraco.Api
 {
   public class Composer : IUserComposer
   {
    public void Compose(Composition composition)
    {
        composition.Register<ISumService, SumService>();
    }
} }

Could you please help me?

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Kevin Jump 2342 posts 14889 karma points MVP 8x c-trib

Jul 29, 2020 @ 15:05

Hi,

I think you've got your SumService being a bit circular ?

The SumService implements ISumService, so it shouldn't need a SumService passing into it rather that is where the code is to do the work?

e.g

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;

namespace MyProject.Umbraco.Api
{
   public class SumService : ISumService
   {
       // this is now parameterless - because we pass nothing in.
       public SumService() 
       { }

       public int Sum(int x, int y)
       {
            // the actually summing happens here?
            int sum = x + y ;
            return sum;
       }
    }
}

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Manish Prajapati 4 posts 34 karma points

Jul 30, 2020 @ 04:26

0

Thanks for noticing it. I have removed the circular dependency. Now, it is working fine :). Thank you so much for your help.

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