Checkboxlistfor with error

Question

Description: Error when compiling a resource needed to fulfill this request. Examine the error-specific details and modify the source code appropriately.

Compiler Error Message: CS1061: 'System.Web.Mvc.Htmlhelper' does not contain a definition for 'Checkboxlistfor' and no extension method 'Checkboxlistfor' accepts that a first argument of type 'System.Web.Mvc.Htmlhelper' is found (You are not using an Assembly guideline or reference?)

I already downloaded his Assembly, I even have in the references, but he makes this mistake.

And it would have to put together with this checkboxlist, radio Buttons and text inputs ?

Here is the view code:

@using MvcCheckBoxList.Model
@model MvcCheckBoxListForApp.Models.FruitViewModel

@{
  ViewBag.Title = "Home Page";
}

<section class="checkBoxListFor">
  <p>
     <label>Please Select Fruits:</label>
     @using (Html.BeginForm("Index", "Home", FormMethod.Post))
     {
         @Html.CheckBoxListFor(model => model.PostedFruits.FruitIds,
                               model => model.AvailableFruits,
                               fruit => fruit.Id,
                               fruit => fruit.Name,
                               model => model.SelectedFruits,
                               Position.Horizontal)
         <input class="green" type="submit"
                value="POST to Controller" />
    }
    </p>
</section>

Answer 1

Example:

1 - View

@model WebApplication2.Models.BaseModel
@{
    ViewBag.Title = "Listas";
    Layout = "~/Views/Shared/_Layout.cshtml";
}
<h2>Listas</h2>
@using (Html.BeginForm())
{
    @Html.CheckBoxListFor(
        p => p.BaseSend.Send,
        p => p.BaseAll,
        p => p.Id,
        p => p.Name,
        b => b.BaseSelected            
    )
    <button type="submit">Enviar</button>
}

---

2 - Classes

public class Base
{       
    public int Id { get; set; }
    public string Name { get; set; }
    public bool IsSelected { get; set; }
    public object Tags { get; set; }
    
}

public class BaseModel
{
    public IEnumerable<Base> BaseAll { get; set; }
    public IEnumerable<Base> BaseSelected { get; set; }
    public BaseSend BaseSend { get; set; }
}

public class BaseSend
{
    public string[] Send { get; set; }
}

---

3 - Controller (Method: Lists (GET and POST))

public ActionResult Listas()
{
    BaseModel baseModel = new BaseModel();

    baseModel.BaseAll = new List<Base>(){
        new Base() { Id = 1, Name="Produto 1", IsSelected = true, Tags="Produtos"},
        new Base()  {Id = 2, Name="Produto 2", IsSelected = false, Tags="Produtos"}
    };

    baseModel.BaseSelected = new List<Base>(){
         new Base() { Id = 1, Name="Produto 1", IsSelected = true, Tags="Produtos"},
    };

    return View(baseModel);
}


[HttpPost]
public ActionResult Listas(BaseSend BaseSend)
{    
    return RedirectToAction("Listas");
}

---

4 - Generated Html

---

5 - Recovering Values

---

All copyright to the website How to Use Checkboxlistfor With ASP.NET MVC 4?

Answer 2

According to the documentation:

You need to add the following reference to your view first:

@using MvcCheckBoxList.Model