Which Sitecore library does the FieldViewModel class reside in?

Question

I'm investigating Sitecore Forms on Sitecore 9.1 and am trying to create a custom form element as explained here https://doc.sitecore.com/developers/91/sitecore-experience-manager/en/walkthrough--creating-a-custom-form-element.html

My using statements are:

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using Sitecore.Data;
using Sitecore.Mvc;
using Sitecore.Collections;
using Sitecore.ExperienceForms;

namespace xxxxxxxxxx.Feature.SitecoreForms.Models
{
    public class CourseViewModel : FieldViewModel
    {
    }
}

But on FieldViewModel I'm getting a compile error:

The type or namespace name 'FieldViewModel' could not be found (are you missing a using directive or an assembly reference?)

I'm not sure which nuget package would include FieldViewModel... any ideas? I can't seem to find anything online

The Sitecore nuget packages I have installed in the project so far are:

• Sitecore.Analytics
• Sitecore.ExperienceForms
• Sitecore.Kernel
• Sitecore.Mvc
• Sitecore.XConnect

(All v9.1.0)

What am I missing? any ideas?

Answer 1

It's in Sitecore.ExperienceForms.Mvc.dll.

The full class name with namespace is

Sitecore.ExperienceForms.Mvc.Models.Fields.FieldViewModel