Error Fix in MVC Application

Question

1.00/5 (1 vote)

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Error:-The name 'productService' does not exist in the current context

My code Following:-

C#

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Kendo.Mvc.Extensions;
using Kendo.Mvc.UI;
using System.Web.Mvc;
using Kendo.Mvc.Examples.Models;


namespace Kendo.Mvc.Examples.Controllers
{
    public class HomeController : Controller
    {
        public ActionResult Index()
        {
            ViewBag.Message = "Welcome to ASP.NET MVC!";

            return View();
        }

        public ActionResult About()
        {
            ViewBag.Message = "Your app description page.";

            return View();
        }

        public ActionResult Contact()
        {
            ViewBag.Message = "Your contact page.";

            return View();
        }


        public ActionResult Editing_Popup()
        {
            //ViewBag.Message = "Your contact page.";

            return View();
        }

         public ActionResult EditingPopup_Read([DataSourceRequest] DataSourceRequest request)
        {
            return Json(productService.Read().ToDataSourceResult(request));
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult EditingPopup_Create([DataSourceRequest] DataSourceRequest request, ProductViewModel product)
        {
            if (product != null && ModelState.IsValid)
            {
                productService.Create(product);
            }

            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult EditingPopup_Update([DataSourceRequest] DataSourceRequest request, ProductViewModel product)
        {
            if (product != null && ModelState.IsValid)
            {
                productService.Update(product);
            }

            return Json(new[] {product}.ToDataSourceResult(request,ModelState));
        }

        [AcceptVerbs(HttpVerbs.Post)]
        public ActionResult EditingPopup_Destroy([DataSourceRequest] DataSourceRequest request, ProductViewModel product)
        {
            if (product != null)
            {
                productService.Destroy(product);
            }

            return Json(new[] { product }.ToDataSourceResult(request, ModelState));
        }

    }
    }

Posted 19-Nov-14 18:47pm

Nishant.Chauhan80

Updated 19-Nov-14 20:10pm

Suraj Sahoo | Coding Passion

v2

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Comments

Sinisa Hajnal 20-Nov-14 2:32am

Well, the error says it all, it doesn't exist in HomeController. Where do you create it? Why do you think it should be visible in HomeController?

Nishant.Chauhan80 20-Nov-14 2:47am

plz sir explain brief

1 solution

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Suraj Sahoo | Coding Passion · Answer 1 · 2014-11-19T20:20:00

Solution 1

Hello Nishant,
you need to add the interface reference to the controller. I hope you are aware of dependency Injection and used a tool out of Unity, Ninject, StructureMap3 to resolve the injection.
For adding the reference you need to add a parameterized constructor to the controller like below:-

C#

public class HomeController : Controller
{
    private readonly IProductService _productService;
    public HomeController(IProductService productService)
     {
        _productService = productService;
     }
///then you can access each method defined in the Interface and implemented in the respective Service.
}

NOTE:- This will only work out, if you have used Dependency Resolver as mentioned above the Nuget Package tools. Else you will get error saying, No parameterless constructor defined
In the Interface:-

C#

namespace YOUR NAMESPACE GOES HERE
{
    public interface IProductService
    {
        void CreateProduct(MODEL/CLASS);
    }  
}
=================================================
public class ProductService : IProductService
{
    //Implement the methods declared in the Interface..
}

Hope this helps
Post back your queries if any.
Thanks
:)

Posted 19-Nov-14 20:20pm

Suraj Sahoo | Coding Passion

Updated 20-Nov-14 1:58am

v2

Comments

Nishant.Chauhan80 20-Nov-14 2:39am

how ? please brief describe

[no name] 20-Nov-14 2:48am

Are you aware of dependency Injection?

[no name] 20-Nov-14 2:53am

Here you need to introduce dependency injection. This would let you access to the interface method.
Have you defined an interface?

[no name] 20-Nov-14 3:05am

would you respond back so that this issue could be resolved sooner. :)

Nishant.Chauhan80 20-Nov-14 4:01am

ok i will try solve this...

[no name] 20-Nov-14 4:31am

Did you add thi peice of code which i have mention in my solution to the controller?

Nishant.Chauhan80 20-Nov-14 4:05am

sir plz give one example display how do this..

[no name] 20-Nov-14 6:45am

if there is any error coming after adding my code please reply back.

Nishant.Chauhan80 20-Nov-14 7:39am

your code is right i have generated "IProductService.cs" file but i dont know code (create,update delete) in this fields

internal void Create(Kendo.Mvc.Examples.Models.ProductViewModel product)
{
throw new NotImplementedException();
}

internal void Update(Kendo.Mvc.Examples.Models.ProductViewModel product)
{
throw new NotImplementedException();
}

internal void Destroy(Kendo.Mvc.Examples.Models.ProductViewModel product)
{
throw new NotImplementedException();
}

[no name] 20-Nov-14 7:41am

You need to have the database operations to be done in the service. Add methods into the Interface and implement in the ProductService that inherits IProductService

Nishant.Chauhan80 20-Nov-14 7:41am

how ?

[no name] 20-Nov-14 7:59am

check the updated solution
I hope this helps you.
And the db operations you need to code.

Nishant.Chauhan80 20-Nov-14 8:05am

thank you very much sir

[no name] 20-Nov-14 8:21am

If this has helped you anyway, please accept the solution and mark as answer, as it may come handy for others.
Thank you :)