Interview Questions and Answers

public HttpResponseMessage Get()
{
    var data = new { Name = "John", Age = 30 };
    var response = Request.CreateResponse(HttpStatusCode.OK, data, "application/json");
    return response;
}

[RoutePrefix("api/products")]
public class ProductsController : ApiController
{
    [Route("")]
    public IHttpActionResult Get()
    {
        // Return all products
    }

    [Route("{id:int}")]
    public IHttpActionResult Get(int id)
    {
        // Return product by ID
    }

    [Route("")]
    public IHttpActionResult Post(Product product)
    {
        // Create a new product
    }

    [Route("{id:int}")]
    public IHttpActionResult Put(int id, Product product)
    {
        // Update an existing product
    }

    [Route("{id:int}")]
    public IHttpActionResult Delete(int id)
    {
        // Delete a product
    }
}

using System.Web.Mvc;

Create a method that returns a View:

public class HomeController : ApiController
{
    [HttpGet]
    public ActionResult Index()
    {
     return View();
    }
}

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

Create a new class that implements the IExceptionFilter interface:
public class MyExceptionFilter : IExceptionFilter
{
    public void OnException(HttpActionExecutedContext context)
    {
        // Handle the exception here
    }
}

public static class WebApiConfig
{
    public static void Register(HttpConfiguration config)
    {
        // Add the exception filter globally
    config.Filters.Add(new MyExceptionFilter());

    // Other configuration code
    }
}

public IHttpActionResult Get(int id)
{
    var product = _productService.GetProduct(id);
    if (product == null)
    {
        return NotFound();
    }
    return Ok(product);
}

using System;
using System.Web.Http;
using Microsoft.Owin.Hosting;
using Owin;

public class Startup
{
    public void Configuration(IAppBuilder appBuilder)
    {
        HttpConfiguration config = new HttpConfiguration();
        config.Routes.MapHttpRoute(
        name: "DefaultApi",
        routeTemplate: "api/{controller}/{id}",
        defaults: new { id = RouteParameter.Optional }
    );
    appBuilder.UseWebApi(config);
    }
}

class Program
{
    static void Main(string[] args)
    {
        string url = "http://localhost:8080";
        using (WebApp.Start<Startup>(url))
        {
            Console.WriteLine($"Web API started at {url}");
            Console.ReadLine();
        }
    }
}