Newtonsoft.Json 空数组反序列化

[tangxingangtom]

--下面是json

{
"user_idcard_suspicion": {
                "idcard_with_other_names": [],
                "idcard_with_other_phones": [],
                "idcard_applied_in_orgs": []
            }
}

phone_with_other_idcards 里面可能有参数,也可能没有,当没有的时候需要反序列化实体为null就好

正常情况下是这样的

{
    "user_idcard_suspicion": {
                "idcard_with_other_names":  [
                    {
                      "susp_name": "吴小汉",  
                      "susp_updt": "2015-11-09 19:25:04" 
                    }
                ],
                "idcard_with_other_phones": [
                    {
                      "susp_phone_province": "江苏",    
                      "susp_phone_operator": "中国移动",
                      "susp_updt": "2015-11-02 10:31:39",
                      "susp_phone": "13773215030",
                      "susp_phone_city": "苏州"
                    }
                ],
                "idcard_applied_in_orgs": [
                    {
                      "susp_org_type": "线上信用卡代还",
                      "susp_updt": "2015-10-23 16:31:00"
                    }
                ]
            }
}

下面是实体

 public HonpotUserIdcardSuspicion user_idcard_suspicion { get; set; }

public class HonpotUserIdcardSuspicion
    {
        /// <summary>
        /// 用这个身份证号码绑定的其他姓名
        /// </summary>
        public List<HonpotIdcardWithOtherNames> idcard_with_other_names { get; set; }

        /// <summary>
        /// 用这个身份证绑定的其他手机号码
        /// </summary>
        public List<HonpotIdcardWithOtherPhones> idcard_with_other_phones { get; set; }

        /// <summary>
        /// 身份证在那些类型的机构中使用过
        /// </summary>
        public List<HonpotIdcardAppliedInOrgs> idcard_applied_in_orgs { get; set; }
    }

JsonConvert.DeserializeObject<HoneypotSearch>(result); 使用的方法为这个



接口那边返回过来有时候有值,有时候没值,现没值的情况下报错
Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'idcard_with_other_names'because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly.
To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array.
Path 'bb', line 1, position 17.

[全栈极简]

try{ //方案一序列化 }catch(Exception ex){ //方案二序列化 }

[tangxingangtom]

这样肯定不行

[tangxingangtom]

#region GetHoneypotSearchJson public static string GetHoneypotSearchJson(string result) { result = result.Replace("\"blacklist_category\":[],", ""); result = result.Replace("\"blacklist_details\":[],", ""); result = result.Replace("\"register_orgs\":[],", ""); result = result.Replace("\"phone_with_other_idcards\":[],", ""); result = result.Replace("\"phone_applied_in_orgs\":[],", ""); result = result.Replace("\"phone_with_other_names\":[],", ""); result = result.Replace("\"idcard_with_other_names\":[],", ""); result = result.Replace("\"idcard_with_other_phones\":[],", ""); result = result.Replace("\"idcard_applied_in_orgs\":[],", ""); return result; } #endregion 死办法解决了,希望能有更优化的解决方案

[以专业开发人员为伍]

数组有0个单元，跟 null 完全是两个概念。你应该先把你的源对象中的数组改为null，然后再 sjon 序列化。

[以专业开发人员为伍]

引用 楼主 tangxingangtom 的回复:

接口那边返回过来有时候有值,有时候没值,现没值的情况下报错 Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'idcard_with_other_names'because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path 'bb', line 1, position 17.

这是你对数据处理的规则出错（也就是产生了什么“只有0个单元的数据集合）。这是你的处理代码有错，怎么能纠结到人家 json 上呢？

[showjim]

试试fastCSharp

            HoneypotSearch value = fastCSharp.emit.jsonParser.Parse<HoneypotSearch>(result);

[龍过鸡年]

使用 JsonSerializerSettings 的 NullValueHandling 设置 JsonConvert.DeserializeObject(s, new JsonSerializerSettings { NullValueHandling = Newtonsoft.Json.NullValueHandling.Ignore }); NullValueHandling setting http://www.newtonsoft.com/json/help/html/NullValueHandlingIgnore.htm 序列化时，如果字段或属性为 null，则不对其序列化。估计就是这个样子的 { "user_idcard_suspicion": { } } 反序列化时，如果没有发现该字段或属性，则设置为 null。

[tangxingangtom]

引用 5 楼 sp1234 的回复:

[quote=引用 楼主 tangxingangtom 的回复:] 接口那边返回过来有时候有值,有时候没值,现没值的情况下报错 Cannot deserialize the current JSON array (e.g. [1,2,3]) into type 'idcard_with_other_names'because the type requires a JSON object (e.g. {"name":"value"}) to deserialize correctly. To fix this error either change the JSON to a JSON object (e.g. {"name":"value"}) or change the deserialized type to an array or a type that implements a collection interface (e.g. ICollection, IList) like List<T> that can be deserialized from a JSON array. JsonArrayAttribute can also be added to the type to force it to deserialize from a JSON array. Path 'bb', line 1, position 17.

这是你对数据处理的规则出错（也就是产生了什么“只有0个单元的数据集合）。这是你的处理代码有错，怎么能纠结到人家 json 上呢？[/quote] 他那边json确实没有问题,现在的问题是我这边反序列化json有问题,所以希望朋友给个解决方案

[我叫小菜菜]

根据文档自定义序列化格式

    public class MyJsonSerializerSettings
    {
        private MyJsonSerializerSettings() { }

        /// <summary>
        /// <para>json序列化的设置1</para>
        /// <para>DateFormatHandling.IsoDateFormat： writes dates in the ISO 8601 format, e.g. "2012-03-21T05:40Z".</para>
        /// <para>MissingMemberHandling：</para>
        /// <para>NullValueHandling：空值则忽略，不做json序列化</para>
        /// </summary>
        public static JsonSerializerSettings serSettings1
        {
            get
            {
                return new JsonSerializerSettings
                {
                    //DateFormatHandling = DateFormatHandling.IsoDateFormat,
                    MissingMemberHandling = MissingMemberHandling.Ignore,
                    ReferenceLoopHandling = ReferenceLoopHandling.Serialize,
                    NullValueHandling = NullValueHandling.Ignore,
                    DefaultValueHandling = DefaultValueHandling.Include,
                    //ObjectCreationHandling = ObjectCreationHandling.Auto,
                    TypeNameHandling = TypeNameHandling.Auto 
                };
            }
        }
    }

这个 "idcard_with_other_names": [ { "susp_name": "吴小汉", "susp_updt": "2015-11-09 19:25:04" } ] 定义肯定是MYTYPE [] idcard_with_other_names; 如果是"idcard_with_other_names": []，反序列化后，idcard_with_other_names.length=0. 如果是"idcard_with_other_names": null，反序列化后，idcard_with_other_names.length=null？ 所以使用时，if(idcard_with_other_names.length!=null &&idcard_with_other_names.length.length>0)即可。

[我叫小菜菜]

更正一下： ...... 定义肯定是MYTYPE [] idcard_with_other_names; 如果是"idcard_with_other_names": []，反序列化后，idcard_with_other_names.length=0. 如果是"idcard_with_other_names": null，反序列化后，idcard_with_other_names=null？ 所以使用时，

if(idcard_with_other_names!=null &&idcard_with_other_names.length>0)

即可。