序列化将匿名子JSON属性反序列化为模型,当某些属性为null时

时间:2013-08-21 13:58:03

标签: c# json json.net javascriptserializer

这是对此问题的跟进问题Serialize deserialize anonymous child JSON properties to model

我可以使用位置字段的字典对象

在我的数据如下时正确地反序列化JOSN
{"id":"2160336","activation_date":"2013-08-01","expiration_date":"2013-08-29","title":"Practice Manager","locations":{"103":"Cambridge","107":"London"}}

然而,当数组中没有值时,我会遇到问题,即有时会有像这样的数据

{"id":"2160336","activation_date":"2013-08-01","expiration_date":"2013-08-29","title":"Practice Manager","locations":[]}

有什么建议吗?如果我能拥有一本可以为空的字典,那会很容易,但是我不能拥有那么好吗?

我的课程看起来像这样:

public class ItemResults
{
    public int Id { get; set; }

    public DateTime Activation_Date { get; set; }

    public DateTime Expiration_Date{ get; set; } 

    public string Title { get; set; }

    public Dictionary<string, string> Locations { get; set; }
}

我尝试使用JavaScriptSerializer和Newtonsoft JSON.net反序列化器进行反序列化,但都有相同的错误。

2 个答案:

答案 0 :(得分:1)

虽然你说过,你找到了答案,也许其他一些SO用户想要使用它。

通过创建自定义JsonConverter ,反序列化可以适用于您的两个jsons

var res = JsonConvert.DeserializeObject<ItemResults>(json,new CustomConverter());

public class CustomConverter : JsonConverter
{
    public override bool CanConvert(Type objectType)
    {
        return objectType == typeof(Dictionary<string, string>);
    }

    public override object ReadJson(JsonReader reader, Type objectType, object existingValue, JsonSerializer serializer)
    {
        if (objectType == typeof(Dictionary<string, string>) && reader.TokenType== JsonToken.StartArray)
        {
            reader.Read(); // Read JsonToken.EndArray
            return new Dictionary<string,string>(); // or return null
        }
        serializer.Converters.Clear(); //To avoid Infinite recursion, remove this converter.
        return serializer.Deserialize<Dictionary<string,string>>(reader);
    }

    public override void WriteJson(JsonWriter writer, object value, JsonSerializer serializer)
    {
        throw new NotImplementedException();
    }
}

答案 1 :(得分:0)

好的,这里给了我解决问题的方法How to deserialize object that can be an array or a dictionary with Newtonsoft?

 public Dictionary<string, string> Location_Options
    {
        get
        {
            var json = this.LocationsJson.ToString();
            if (json == string.Empty | json == "[]")
            {
                return new Dictionary<string, string>();
            }
            else
            {
                return JsonConvert.DeserializeObject<Dictionary<string, string>>(json);
            }
        }
    }

    [JsonProperty(PropertyName = "Locations")]
    public object LocationsJson { get; set; }

非常感谢大家的帮助