[英]Unable to de-serialize a JSON string with a dynamically changing node in C#
我的JSON看起来像这样-
{"0abc34m": {"time": "13 Mar 17, 4:50:02 PM", "pd": "oscar"}}
我正在使用此代码反序列化-
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(JSONstring));
ms.Position = 0;
DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(Rootobject));
Rootobject myDataTypObj = (Rootobject)jsonSerializer.ReadObject(ms);
我使用了Visual Studio函数“将JSON作为类粘贴”函数来生成这些类-
public class Rootobject
{
public _00A462 _00a462 { get; set; }
}
public class _00A462
{
public string time { get; set; }
public string pd { get; set; }
}
我想访问JSON的“时间”和“ pd”成员。
JSON的第一部分是一个数字,每次接收到新的JSON字符串时都会更改。
我没有收到任何错误,但myDataTypObj的_00A462为空值。
我只关心层次结构中第二级的字段,我正确地解决了这个问题吗?
一种简单的方法是使用JSON.Net并将JSON反序列化为Dictionary
using Newtonsoft.Json;
class Program
{
static void Main( string[] args )
{
var jsonString = "{\"0abc34m\":{\"time\":\"13 Mar 17, 4:50:02 PM\",\"pd\":\"oscar\"}}";
Dictionary<string, Data> data;
data = JsonConvert.DeserializeObject<Dictionary<string, Data>>( jsonString );
var key = data.First().Key; // 0abc34m
var time = data.First().Value.TimeString; // 13 Mar 17, 4:50:02 PM
var pd = data.First().Value.DataString; // oscar
}
}
public class Data
{
[JsonProperty("time")]
public string TimeString { get; set; }
[JsonProperty("pd")]
public string DataString { get; set; }
}
类似于Rufo爵士使用Json.Net来将其序列化为JObject的答案:
var json = "{\"0abc34m\": {\"time\": \"13 Mar 17, 4:50:02 PM\", \"pd\": \"oscar\"}}";
dynamic d = JObject.Parse(json);
var values = (d.Properties() as IEnumerable<JProperty>)
.First()
.Value as JObject;
var time = DateTime.Parse(((values.Properties() as IEnumerable<JProperty>)
.First()
.Value as JValue).Value as string);
var pd = ((values.Properties() as IEnumerable<JProperty>)
.Skip(1)
.First()
.Value as JValue).Value as string;
Console.WriteLine(time);
Console.WriteLine(pd);
结果:
3/13/2017 4:50:02 PM
oscar
如果您知道JSON的确切结构,则可以读取第一个(随机)数字,将其替换为具有已知标识符的字符串,然后解析为JSON。
接下来的代码需要调试!!!
string json_string = ...;
int first_quot_pos = json_string.IndexOf("\"");
int second_quot_pos = json_string.IndexOf("\"", first_quot_pos + 1);
string random_number = json_string.Substring(first_quot_pos, second_quot_pos - first_quot_pos);
string updated_json_string = json_string.Replace(random_number, "number");
您的JSON现在应如下所示:
{"number": {"time": "13 Mar 17, 4:50:02 PM", "pd": "oscar"}}
然后使用updated_json_string
:
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(updated_json_string));
ms.Position = 0;
DataContractJsonSerializer jsonSerializer = new DataContractJsonSerializer(typeof(Rootobject));
Rootobject myDataTypObj = (Rootobject)jsonSerializer.ReadObject(ms);
现在,您的Rootobject
应该看起来像这样:
public class Rootobject
{
public Number number { get; set; }
}
public class Number
{
public string time { get; set; }
public string pd { get; set; }
}
现在,您有了具有myDataTypObj.number.time
和myDataTypObj.number.pd
对象。 你也有random_number
。
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