无法从ASP.NET Web API获得响应

Question

I'm setting up an ASP.net web API, but i keep getting 404 from all Http routes.

This is running on http://localhost:52011/ since that is the default location that VS2013 uses. I've added a simple test HttpRoute that just returns a string if it's called with a GET to test connectivity.

Directory browsing is enabled for feedback that the web API is in fact on localhost, and all directories of the project are visible.

I've tried setting the controller name fixed in the routes in WebApiConfig.cs and read a lot about the HttpRoute mappings, but i keep getting either a 404 or a "No Type was found that matches the controller named controllername ".

I'm using Postman to test since that was recommended and easy to use.

Any tips are welcome!

WebApiConfig.cs:

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

namespace BadgePrinter
{
    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {            
            config.MapHttpAttributeRoutes();
            //route to print badge.
            config.Routes.MapHttpRoute(
                name: "apiPrint",
                routeTemplate: "api/{controller}/{action}/{Bedrijf}/{Aanspreektitel}/{Voornaam}/{Achternaam}/{Jobtitle}/{Kopies}/{Rijksregisternummer}/{BadgeAfdruk}/{printer}/{Image}",
                defaults: new { Image = RouteParameter.Optional}
            );
            //test route to get string back
            config.Routes.MapHttpRoute(
                name: "apiTest",
                routeTemplate: "api/{controller}/{action}/{id}",
                defaults: new { id = RouteParameter.Optional }
            );
        }
    }
}

BadgeController.cs(the only controller in the project)

The first method is the one i'm going to have to use eventually, but the testmethod is the one i use for testing.

using BadgePrinter.CardTemplates;
using BadgePrinter.Interfaces;
using System;
using System.Collections.Generic;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Net;
using System.Threading.Tasks;
using System.Web;
using System.Web.Http;

namespace BadgePrinter.Controllers
{
    public class BadgeController : ApiController
    {     
        //removed the first method since it was big and distracting.
        // test method
        [HttpGet]
        public IHttpActionResult GetAllProducts()
        {
            return Ok("some product");
        }
    }
}

link for the testmethod that i'm using: http://localhost:52011/api/BadgeController/Products/1

I also tried this link, even though that shouldn't matter: http://localhost:52011/api/BadgeController/Products/1

Result:

{
    "Message": "No HTTP resource was found that matches the request URI 'http://localhost:52011/api/BadgeController/Products/1'.",
    "MessageDetail": "No type was found that matches the controller named 'BadgeController.cs'."
}

For the other HttpRoute, i keep getting 404, but i'll be in heaven if i can get the test to work :) PS: i'm new to this kind of thing(ASP.net and API's) so i'm sorry if i'm being an idiot.

Answer 1

You have 2 issues here:

1) Your controller name BadgeController but in your API it should be Badge only. The correct URL should be:

http://localhost:52011/api/Badge/xxx

2) I can't see method name Products or something like that in your code.

3) If it is a POST method, it must have [FromBody] in parameter input.

Answer 2

There are some problems with your URL:

http://localhost:52011/api/BadgeController/Products/1 

As far as I can see you don't have any GET method which would map to an ID parameter. All you have in your controller is

[HttpGet]
public IHttpActionResult GetAllProducts()

which doesn't accept any inputs.

2) The documented Web API convention is that you don't write "Controller" explicitly in the URL. Just the first part which is unique to the controller ( Badge ) in this case is required.

3) I can't see where you are getting the "Products" part of the URL from. There's no custom route definition or attribute which would make that part of the route. Again the convention is that you define an action method whose name starts with "Get" and that will map to a GET request to the controller name, with no further bits and pieces on the end. The rest of the method's name is irrelevant - and in your case AllProducts doesn't match to /Products anyway...so even if that was necessary it would still be incorrect.

In conclusion, the correct URL to access your GET action should be:

http://localhost:52011/api/Badge/

---

NB If you were to either change your existing GetAllProducts method, or add a second method like this:

[HttpGet]
public IHttpActionResult Get(int id)
{
  return Ok("Product" + id);
}

Then you could use the ID in your URL, eg

http://localhost:52011/api/Badge/1

and it should route to this method.

Answer 3

Try dropping the controller part of the url:

http://localhost:52011/api/Badge/Products/1