无法序列化 json 键值对

Posted 2023-03-30

【中文标题】无法序列化 json 键值对

【英文标题】：Unable to serialize json keyvaluepair

【发布时间】：2016-04-16 10:50:48

【问题描述】：

我有 json，尝试使用 Newtonsoft.Json 对 json 进行反序列化，但我无法在列表中获取某些值。

这就是我的 json 的样子

    "status": "success",
    "msg": "success",
    "code": 1,
    "data": 
        "country": "India",
        "countryid": "766",
        "operator": "Airtel India",
        "operatorid": "1371",
        "connection_status": "99",
        "destination_msisdn": "919895070723",
        "destination_currency": "INR",
        "product_list": "100,200,300,330,350,440,500,1000",
        "service_fee_list": "0.00,0.00",
        "retail_price_list": "7.50,14.50,21.50,70.50",
        "wholesale_price_list": "6.05,12.03,29.97,59.85",
        "local_info_value_list": "100.00,1000.00",
        "local_info_amount_list": "87.00,175.00,887.00",
        "local_info_currency": "INR",
        "authentication_key": "16809",
        "error_code": "0",
        "error_txt": "Transaction successful",
        "nick_name": "eldho",
        "price_map": 
            "100": "7.50",
            "200": "14.50",
            "300": "21.50",
            "330": "23.50",
            "350": "25.00",
            "440": "31.50",
            "500": "35.50",
            "1000": "70.50"
        ,
        "local_info": 
            "100": "87.00",
            "200": "175.00",
            "300": "264.00",
            "330": "290.40",
            "350": "350.00",
            "440": "387.20",
            "500": "442.00",
            "1000": "887.00"
        ,
        "service_map": 
            "100": "0.00",
            "200": "0.00",
            "300": "0.00",
            "330": "0.00",
            "350": "0.00",
            "440": "0.00",
            "500": "0.00",
            "1000": "0.00"
        ,
        "operator_logo": "https:\/\/fm.transfer-to.com\/logo_operator\/logo-1371",
        "promo_code": 0,
        "benef_id": "16598"
    

更新：local_info 和 service_map 是动态数据

我通常使用Json2charp创建json模型类

我的序列化代码是这样的

using (var _client = new HttpClient())        
        
    _client.BaseAddress = new Uri(baseServiceUri);

    var content = new FormUrlEncodedContent(new[] 
    
        new KeyValuePair<string,string>("someparameter",token),
        new KeyValuePair<string,string>("id",myId.ToString()),        
    );

    var response = await _client.PostAsync(new Uri(baseAccessPoint, UriKind.Relative), content);

    if (!response.IsSuccessStatusCode)
    
        throw new HttpRequestException(response.ReasonPhrase);
    

    //I get value in this 
    var responseResult = await response.Content.ReadAsStringAsync();

    //Unable to deseralize it.
    return JsonConvert.DeserializeObject<BeneficoryMobileDTO>(responseResult, new JsonSerializerSettings()
    
        //NullValueHandling = NullValueHandling.Ignore,
        Error = JsonDeserializeErrorHandler,    
    );

我的模型看起来像这样。

 [DataContract]
public class BeneficoryMobileDTO

    [DataMember]
    public string status  get; set; 

    [DataMember]
    public string msg  get; set; 

    [DataMember]
    public string code  get; set; 

    [DataMember(Name = "data")]
    public BeneficoryMobileDetailsDTO BeneficoryMobileDetails  get; set; 


public class BeneficoryMobileDetailsDTO

    //I have removed some property to show things that doesn't work

    //THIS CAN'T BE SERALIZED
    [DataMember(Name = "PriceMap")]
    public dynamic price_map  get; set; 

    //THIS CAN'T BE SERALIZED
    [DataMember(Name = "ServiceMap")]
    public dynamic service_map  get; set; 

    //THIS CAN'T BE SERALIZED 
    [DataMember(Name = "LocalInfo")]
    public object LocalInfo  get; set; 


    [DataMember]
    public int benef_id  get; set; 

只有 LocalInfo 、 ServiceMap 和 PriceMap 此属性获取 Null 值。除了它之外的所有东西都是序列化的。

请告诉我我做错了什么

【问题讨论】：

数字是否总是相同（即 100、200、300、330 等）？

【参考方案1】：

问题的原因是属性的名称。它们不能在 C# 中直接用作标识符mustn't begin with a number (identifier-start-character)。所以这样的属性是无效的：

public string 100  get; set;  // "100" is an invalid property name
// generates compiler error CS1519: Invalid token '100' in class, struct, or interface member declaration

json2csharp（我以前不知道；真是个好工具！）在生成以下类时给你一个提示：

public class PriceMap

    public string __invalid_name__100  get; set;  // invalid hint
    public string __invalid_name__200  get; set; 
    // other props omitted

要让反序列化成功，您可以做的是注释这些属性（请参阅documentation）并告诉 json.net 应该如何映射它们：

public class PriceMap

    [JsonProperty(PropertyName = "100")]
    public string _100  get; set; 
    [JsonProperty(PropertyName = "200")]
    public string _200  get; set; 
    // other props omitted

---

替代方案：

您不必使用由 json2csharp 生成的 PriceMap 等类，并且可以像您在问题中所做的那样坚持使用 dynamic。

基本上发生的问题只是属性的名称。结果始终为空，因为您通过 DataMember-attribute 告诉 json.net 它应该将 json 键 "PriceMap" 映射到名为 price_map 的属性。这不起作用，因为您的 json 中没有 json 键 "PriceMap"。相反，它被简单地称为"price_map"。所以删除DataMember-attribute，属性就会被正确映射。

---

附带说明：如果您不想离开 Visual Studio，有一个很酷的功能将 JSON 粘贴为类，它会为您自动生成必要的类：

【讨论】：

这是动态生成的，我该如何映射它

命名有问题。我的错误我以前没有发现这个。

请更新您的答案，我可以将其标记为答案