如何强制netwtonsoft json序列化程序将datetime属性序列化为字符串？

public class DateTimeToStringConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(DateTime);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        writer.WriteValue(((DateTime)value).ToString());
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (reader.Value == null)
        {
            return null;
        }

        return DateTime.Parse(reader.Value.ToString());
    }
}

public class MyClass
{
    [JsonConverter(typeof(DateTimeToStringConverter))]
    public DateTime MyDateTime { get; set; }
}