Serialize EF dbset - quickly adapt action method to dump dbset to json without serializing virtual navigation props

serialize_dbset_without_error.cs

// As described in https://stackoverflow.com/q/26162902/84369
public ActionResult Index()
{
    var sketches = db.Sketches.Include(p => p.Board);

    // Serializer settings
    var settings = new JsonSerializerSettings
    {
        ContractResolver = new CustomResolver(),
        PreserveReferencesHandling = PreserveReferencesHandling.None,
        ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
        Formatting = Formatting.Indented
    };

    var json = Newtonsoft.Json.JsonConvert.SerializeObject(sketches, settings);

    System.IO.File.WriteAllText(@"c:\temp\sketches.json", json);

    return View(sketches.ToList());
}

public class CustomResolver : DefaultContractResolver
{
    public CustomResolver() { }

    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)
    {
        JsonProperty prop = base.CreateProperty(member, memberSerialization);
        var propInfo = member as PropertyInfo;
        if (propInfo != null)
        {
            if (propInfo.GetMethod.IsVirtual && !propInfo.GetMethod.IsFinal)
            {
                prop.ShouldSerialize = obj => false;
            }
        }
        return prop;
    }
}