jsonconvert 序列化时忽略指定的类型

 /// <summary>
    /// 自定义转换类
    /// </summary>
    public class CustomConverter<T> : JsonConverter<T>
    {
        public override T ReadJson(JsonReader reader, Type objectType, T existingValue, bool hasExistingValue, JsonSerializer serializer)
        {
            return existingValue;
        }

        public override void WriteJson(JsonWriter writer, T value, JsonSerializer serializer)
        {
            //遇到指定的类型时返回null,也可以使用JsonWriter writer内部字段根据名称进行扩展...
            writer.WriteNull();
        }
    }

转json扩展

/// <summary>
        /// 将对象序列化成Json字符串
        /// </summary>
        /// <param name="obj">需要序列化的对象</param>
        /// <param name="jsonConverterArray"></param>
        /// <param name="ignoreNullValue">是否忽略值未null的字段</param>
        /// <returns></returns>
        public static string ToJson(this object obj, JsonConverter[] jsonConverterArray, bool ignoreNullValue = false)
        {
            JsonSerializerSettings settings = new JsonSerializerSettings
            {
                NullValueHandling = ignoreNullValue ? NullValueHandling.Ignore : NullValueHandling.Include,
                ReferenceLoopHandling = ReferenceLoopHandling.Ignore,
                MaxDepth = 2,
                Converters = jsonConverterArray
            };
            return JsonConvert.SerializeObject(obj, Formatting.Indented, settings);
        }

使用

 var commandConverter = new CustomConverter<ICommand>();
            var frameworkElementConverter = new CustomConverter<FrameworkElement>();

            JsonConverter[] jsonConverters = { commandConverter, frameworkElementConverter };
            oldSelectPageJson = obj.ToJson(jsonConverters);