JSON.NET JObject - 我如何从这个嵌套的 JSON 结构中获取价值

问题描述

我有这个 JSON:

{
    "client_id": "26075235",
    "client_version": "1.0.0",
    "event": "app.uninstall",
    "timestamp": 1478741247,
    "data": {
        "user_id": "62581379",
        "site_id": "837771289247593785",
        "platform_app_id": "26075235"
    }
}

我将它解析为 JSON.NET JObject，我可以使用例如成功访问第一级值.(string)RequestBody.SelectToken("client_id")

I parse it into a JSON.NET JObject and I can successfully access the first level of values using e.g. (string)RequestBody.SelectToken("client_id")

如何使用 JPath 表达式(或通过访问 JSON.NET JObject 的子对象)访问user_id"的值?这不起作用:

How do I access the value of "user_id" using a JPath expression (or by accessing a child object of the JSON.NET JObject)? This doesn't work:

(string)RequestBody.SelectToken("data[0].user_id")

我不能这样做来解析 JSON 的数据"部分:

and I can't do this to parse the 'data' part of the JSON:

JObject RequestBodyData = JObject.Parse((string)RequestBody.SelectToken("data"));

因为编译器似乎将 RequestBody.SelectToken("data") 识别为对象(我收到错误无法将对象解析为字符串")

as the compiler seems to recognise RequestBody.SelectToken("data") as an object (I get the error 'Can not parse object into string')

并且我不想将原始 JSON 解析为自定义 C# 对象，因为我正在开发一个解决方案，该解决方案需要能够将 JSON 通用解析为 JObject(或任何其他类型的用于处理 JSON 的通用对象)，因此可以以相对一致的方式进行解析.

and I don't want to parse the original JSON into a custom C# object as I'm developing a solution that needs to be able to generically parse JSON into a JObject (or any other type of generic object for handling JSON), so it can be parsed in a relatively consistent way.

推荐答案

SelectToken("data[0].user_id") 不起作用，因为您的 JSON 中没有数组.您应该改用 SelectToken("data.user_id").

SelectToken("data[0].user_id") doesn't work because there isn't an array in your JSON. You should use SelectToken("data.user_id") instead.

小提琴:https://dotnetfiddle.net/K0X4ht

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