C# 反序列化JSON将值转换为特定类型时出错
我有一个Django后端模型,带有创建JSON的REST服务。我得到的JSON(部分)如下所示:C# 反序列化JSON将值转换为特定类型时出错,c#,json,serialization,json.net,C#,Json,Serialization,Json.net,我有一个Django后端模型,带有创建JSON的REST服务。我得到的JSON(部分)如下所示: [ { "id": 1, "username": "T1", "tel": "", "created_on": "2018-09-03T16:29:20.903315Z", "last_login": null, "hasContacts": [ ], "myChanges": [ ], "helpsOnChan
[
{
"id": 1,
"username": "T1",
"tel": "",
"created_on": "2018-09-03T16:29:20.903315Z",
"last_login": null,
"hasContacts": [
],
"myChanges": [
],
"helpsOnChanges": [
],
"shouldHelpOnChanges": [
1
],
"welldone_set": [
{
"id": 1,
"created_on": "2018-09-03T16:29:20.925327Z",
"comment": "You rock1",
"change": 1,
"helper": 1
}
]
},
{
"id": 2,
"username": "T2",
"tel": "",
"created_on": "2018-09-03T16:29:20.903315Z",
"last_login": null,
"hasContacts": [
],
"myChanges": [
{
"id": 1,
"name": "Stop smoking",
"created_on": "2018-09-03T16:29:20.923315Z",
"change": "I want to stop smoking",
"finished_on": null,
"success": false,
"helpee": 2,
"helper": [
],
"requestedHelpers": [
1
],
"welldone_set": [
{
"id": 1,
"created_on": "2018-09-03T16:29:20.925327Z",
"comment": "You rock1",
"change": 1,
"helper": 1
}
]
}
],
"helpsOnChanges": [
],
"shouldHelpOnChanges": [
],
"welldone_set": [
]
}
]
现在JSONConvert.Deserialize调用的显式错误是:
2018-09-02T18:57:13.145反序列化App.ViewModels.Change时出错。将值1转换为类型“App.ViewModels.User”时出错。路径“[0]。myChanges[0]。帮助对象”,第1行,位置275
这是指用户类型的“helpee”属性。Django框架只将用户的id放在这个列表中,这是有意义的,因为在上面的结果之前,用户已经在这个JSON中传输了
那么为什么Newtonsoft.JSON不能解决这个问题呢?它不能将此id与相同id的实际用户实例相关联吗
提前谢谢你!
狼
编辑:为了澄清我的Django后端的序列化程序:
class ChangeSerializer(serializers.ModelSerializer):
welldone_set = WellDoneSerializer(many=True)
class Meta:
model = Change
fields = ('id',
'name',
'created_on',
'change',
'finished_on',
'success',
'helpee',
'helper',
'requestedHelpers',
'welldone_set')
ChangeSerializer.helpee = UserSerializer();
ChangeSerializer.helper = UserSerializer(many=True);
ChangeSerializer.requestedHelpers = UserSerializer(many=True);
正如您所看到的,helpee实际上是一个对象,而不仅仅是一个id
编辑2:将json更新为完整
编辑3:我的反序列化程序方法。在反序列化程序行中引发异常
public static async Task<List<T>> getDataListFromService<T>(string queryString)
{
Debug.WriteLine("###Building HttpClient for " + queryString);
HttpClient client = new HttpClient();
Debug.WriteLine("###Building GetAsync...");
HttpResponseMessage response = await client.GetAsync(queryString);
Debug.WriteLine("### HTTP Get Response: " + response.ReasonPhrase);
List<T> data = null;
if (response.IsSuccessStatusCode)
{
string json = response.Content.ReadAsStringAsync().Result;
Debug.WriteLine("### JSON REsult: " + json);
ITraceWriter writer = new MemoryTraceWriter();
JsonSerializerSettings settings = new JsonSerializerSettings
{
TraceWriter = writer
};
try
{
data = JsonConvert.DeserializeObject<List<T>>(json, settings);
}
catch (System.Exception ex)
{
Debug.WriteLine("### Exception " + ex.Message);
Debug.WriteLine("### Trace Results: " + writer);
}
}
return data;
}
公共静态异步任务getDataListFromService(字符串查询字符串)
{
Debug.WriteLine(“####为”+queryString构建HttpClient);
HttpClient=新的HttpClient();
Debug.WriteLine(“构建GetAsync…”);
HttpResponseMessage response=wait client.GetAsync(queryString);
Debug.WriteLine(“####HTTP Get Response:“+Response.ReasonPhrase”);
列表数据=null;
if(响应。IsSuccessStatusCode)
{
字符串json=response.Content.ReadAsStringAsync().Result;
Debug.WriteLine(“####JSON结果:“+JSON”);
ITraceWriter=新的MemoryTraceWriter();
JsonSerializerSettings设置=新的JsonSerializerSettings
{
TraceWriter=writer
};
尝试
{
data=JsonConvert.DeserializeObject(json,设置);
}
catch(System.Exception-ex)
{
Debug.WriteLine(“###异常”+ex.Message);
Debug.WriteLine(“跟踪结果:+writer”);
}
}
返回数据;
}
如您所想,您应该使用自定义的IReferenceResolver
你在评论中问到如何使用多种类型。您可以使用找到的解析器代码来执行此操作。此链接包括一个完整示例:
所以我把德普挖了进去。我目前正在寻找的是最好的策略:1。自定义IReferenceResolver:这真的对我的任务有帮助吗?我见过一个在然而这个“唯一”似乎工作的一种类型,而我有3个不同的。。?2.编写一个完全自定义的JSON呈现程序,由谁解析示例。。?3.重写后端以始终序列化一个类,然后为子类调用REST服务。。。4.其他选择?使用类似的工具将使您的生活更加轻松。谢谢您的帮助!:)