我有以下课程，将其用作字典中的键：

    public class MyClass
    {
        private readonly string _property;

        public MyClass(string property)
        {
            _property = property;
        }

        public string Property
        {
            get { return _property; }
        }

        public override bool Equals(object obj)
        {
            MyClass other = obj as MyClass;
            if (other == null) return false;
            return _property == other._property;
        }

        public override int GetHashCode()
        {
            return _property.GetHashCode();
        }
    }

我正在运行的测试在这里：

    [Test]
    public void SerializeDictionaryWithCustomKeys()
    {
        IDictionary<MyClass, object> expected = new Dictionary<MyClass, object>();
        expected.Add(new MyClass("sth"), 5.2);
        JsonSerializerSettings jsonSerializerSettings = new JsonSerializerSettings { TypeNameHandling = TypeNameHandling.All };
        string output = JsonConvert.SerializeObject(expected, Formatting.Indented, jsonSerializerSettings);
        var actual = JsonConvert.DeserializeObject<IDictionary<MyClass, object>>(output, jsonSerializerSettings);
        CollectionAssert.AreEqual(expected, actual);
    }

测试失败，因为Json.Net似乎正在使用ToString()字典键上的方法，而不是正确地序列化它们。上面测试得出的json是：

{
  "$type": "System.Collections.Generic.Dictionary`2[[RiskAnalytics.UnitTests.API.TestMarketContainerSerialisation+MyClass, RiskAnalytics.UnitTests],[System.Object, mscorlib]], mscorlib",
  "RiskAnalytics.UnitTests.API.TestMarketContainerSerialisation+MyClass": 5.2
}

这显然是错误的。我如何使它工作？