无法使用列表中的列表反序列化 JSON

Question

我有一个 JSON，数据来自 API

{"S":"Success","Result":{"Data":[[2251,2570205,"05-Sep-19 09:53 AM","--","Rs. 0","Cash","Amount Paid : 0"],[2248,3817456,"01-Sep-19 08:53 AM","--","Rs. 168.00","NC","Reason : NC"],[2247,2997168,"01-Sep-19 08:49 AM","16","Rs. 660.00","Card","Amount Paid : 660, Type : Visa"],[2245,6410400,"01-Sep-19 08:46 AM","16","Rs. 726.00","Card","Amount Paid : 726, Type : Visa"]],"Headers":["S.No.","Order Id","Date","Table No","Amount","Mode of Payment","More Info"],"Footer":["Total","4","","","Rs. 1,386.00","",""]}}

我需要将其转换为 C# 对象才能绑定到 UI。下面是 C# 代码

反序列化对象的代码：

var jsonResult = JsonConvert.DeserializeObject<GenericJSONResponse<ReportRootObject>>(response);

我在 response 对象中得到响应。

对象：

public class ReportRootObject
    {
        public string S { get; set; }
        public ReportMasterDetailsData ReportMasterDetailsData { get; set; }
    }

public class ReportMasterDetailsData
    {
        public List<List<ReportMasterDetails>> Data { get; set; }
        public List<string> Headers { get; set; }
        public List<string> Footer { get; set; }
    }

 public class ReportMasterDetails
    {
        public int SerialNumber { get; set; }
        public int OrderId { get; set; }
        public string Date { get; set; }
        public string TableNumber { get; set; }
        public string Amount { get; set; }
        public string ModeOfPayment { get; set; }
        public string Reason { get; set; }
    }

WHen 尝试使用 jsonResult.Result.ReportMasterDetailsData.Data; 访问字段我在 'ReportMasterDetailsData'

处收到空引用异常

我错过了什么？？

Answer 1

好吧，让我们看看您的 JSON 结果，其格式为 json：

{
  "S":"Success",
  "Result":
   {
    "Data":
     [
        [2251,2570205,"05-Sep-19 09:53 AM","--","Rs. 0","Cash","Amount Paid : 0"],
        [2248,3817456,"01-Sep-19 08:53 AM","--","Rs. 168.00","NC","Reason : NC"],
        [2247,2997168,"01-Sep-19 08:49 AM","16","Rs. 660.00","Card","Amount Paid : 660, Type : Visa"],
        [2245,6410400,"01-Sep-19 08:46 AM","16","Rs. 726.00","Card","Amount Paid : 726, Type : Visa"]
     ],
     "Headers":["S.No.","Order Id","Date","Table No","Amount","Mode of Payment","More Info"],
     "Footer":["Total","4","","","Rs. 1,386.00","",""]
   }
 }

现在让我们看看您的 classes。 jsonResult.Result.ReportMasterDetailsData.Data 将 return 为空，因为在您的 JSON 响应中属性调用了 Result 而不是 ReportMasterDetailsData，因此重命名 ReportMasterDetailsData 属性到 Result。如果您不想更改属性的名称，您可以在属性

中添加 [JsonProperty("Result")]

Data 属性的 ReportMasterDetailsData class 的类型是 List<List<ReportMasterDetails>>，但在 JSON 响应中，此集合没有属性名字。您可以将 List<List<ReportMasterDetails>> 更改为 List<List<string>>，然后以某种方式将其转换为 ReportMasterDetails class。或者您可以不使用属性名称反序列化它。看看 and 。希望对您有所帮助

Answer 2

我建议使用 json2csharp 从 json 字符串创建模型并使用 JsonConvert.PopulateObject 完成其余工作。这是我试过的代码片段。

    public class Result
    {
        public List<List<object>> Data { get; set; }
        public List<string> Headers { get; set; }
        public List<string> Footer { get; set; }
    }

    public class ReportRootObject
    {
        public string S { get; set; }
        public Result Result { get; set; }
    }

    static void Main(string[] args)
    {
        string response = "{\"S\":\"Success\",\"Result\":{\"Data\":[[2251,2570205,\"05 - Sep - 19 09:53 AM\",\"--\",\"Rs. 0\",\"Cash\",\"Amount Paid : 0\"],[2248,3817456,\"01 - Sep - 19 08:53 AM\",\"--\",\"Rs. 168.00\",\"NC\",\"Reason: NC\"],[2247,2997168,\"01 - Sep - 19 08:49 AM\",\"16\",\"Rs. 660.00\",\"Card\",\"Amount Paid : 660, Type: Visa\"],[2245,6410400,\"01 - Sep - 19 08:46 AM\",\"16\",\"Rs. 726.00\",\"Card\",\"Amount Paid : 726, Type: Visa\"]],\"Headers\":[\"S.No.\",\"Order Id\",\"Date\",\"Table No\",\"Amount\",\"Mode of Payment\",\"More Info\"],\"Footer\":[\"Total\",\"4\",\"\",\"\",\"Rs. 1,386.00\",\"\",\"\"]}}";
        ReportRootObject jsonResult = new ReportRootObject();
        JsonConvert.PopulateObject(response, jsonResult);

        Console.WriteLine($"SerialNumber: {jsonResult.Result.Data[0][0]}");
    }

无法使用列表中的列表反序列化 JSON

Unable to deserialise JSON with list inside a list

.net

c#

json

json-deserialization