inabox/InABox.Core/Editors/Utils/DuplicateCodeException.cs

using System;
using System.Collections.Generic;
using System.Linq;

namespace InABox.Core
{
    public class DuplicateCodeException : Exception
    {
        private readonly Dictionary<string, object> _duplicates;

        private readonly Type _type;

        public DuplicateCodeException(Type type, Dictionary<string, object> duplicates)
        {
            _type = type;
            _duplicates = duplicates;
        }

        public override string Message => string.Format("A {0} with {1} already exists!",
            _type.Name,
            string.Join(" and ", _duplicates.Select(x => string.Format("a {0} of ({1})", x.Key, x.Value)))
        );
    }
}