Error: C# The name 'Json' does not exist in the Current context

Question

I have the following error in C# 'The name 'Json' does not exist in the Current context' in my application. I followed all the recommended steps by various websites, such as adding such references and such, but the error continued.

using System;
using System.Web.Mvc;
using System.IO;
using DevExpress.XtraRichEdit;

namespace PCMSO
{
  public partial class pcmso : System.Web.UI.Page
  {
    [HttpPost]
    public JsonResult SalvaTexto(){
        try
        {
            return Json(new { success = true, message = "Salvo!. "}, JsonRequestBehavior.AllowGet);
        }
        catch (Exception ex)
        {
            return Json(new { success = false, message = "Não foi possível salvar o documento. " + ex.Message }, JsonRequestBehavior.AllowGet);
        }
    }
  }
}

Answer 1

Segui todos os passos recomendados por diversos sites, como adicionar tais referências e tal.

Will be?

In your code example, there are only the following namespaces:

using System;
using System.Web.Mvc;
using System.IO;
using DevExpress.XtraRichEdit;

None of them have a type called Json. The first three are authored by Microsoft teams and are well known. The room has documentation here: https://documentation.devexpress.com/WindowsForms/DevExpress.XtraRichEdit.namespace

You need to include the namespace which contains the Json type, or else call the type by its full name (i.e.: System.Web.Helpers.Json, although by signature, it does not seem to be the case).

---

There’s another possibility here, more likely. Maybe you were thinking about Json method of the Controller class. In this case, for your code to work, the class in which you make your implementation should inherit from System.Web.Mvc.Controller. Not the case in the code you posted.