如何告诉Json.NET忽略第三方对象中的属性？

制作自定义合同解析器：

public class ShouldSerializeContractResolver : DefaultContractResolver{    public static ShouldSerializeContractResolver Instance { get; } = new ShouldSerializeContractResolver();    protected override JsonProperty CreateProperty(MemberInfo member, MemberSerialization memberSerialization)    {        JsonProperty property = base.CreateProperty(member, memberSerialization);     if (typeof(Account).IsAssignableFrom(member.DeclaringType) && member.Name == nameof(Account.PasswordHash))        { property.Ignored = true;        }        return property;    }}

我如何测试它：

        var account = new Account        { PasswordHash = "XXAABB"        };        var settings = new JsonSerializerSettings        { ContractResolver = ShouldSerializeContractResolver.Instance        };        var json = JsonConvert.SerializeObject(account, settings);        Console.WriteLine(json);