Umbraco-CMS/src/Umbraco.Core/Models/SimpleValidationModel.cs

using System.Collections.Generic;

namespace Umbraco.Cms.Core.Models
{
    public class SimpleValidationModel
    {
        public SimpleValidationModel(IDictionary<string, object> modelState, string message = "The request is invalid.")
        {
            Message = message;
            ModelState = modelState;
        }

        public string Message { get; }
        public IDictionary<string, object> ModelState { get;  }
    }
}