如何解析嵌套的JSON数据结构 [英] How to parse nested JSON data structure

问题描述

在Windows Phone应用中，我需要解析JSON数据.我能够获取未嵌套的键的值.但是，如果JSON在数组中包含数组，那么如何从JSON文件中提取值?

In a Windows Phone app I need to parse JSON data. I am able to get the values for keys which aren't nested. But if the JSON has arrays inside arrays, then how do I extract values from the JSON file?

过去，我所做的工作是将JSON解析为JArray对象，然后从JToken中获得指定字符串键的值.

In the past what I did was parse the JSON into a JArray object, then from the JToken I got the value of a specified string key.

在下面的JSON中，people具有men和women，并且men本身具有许多具有不同ID的人.因此，如果我将这个完整的东西作为JSON字符串使用，该如何打印特定男人的ID值?如果这里没有嵌套数组，我本可以转换为JArray并访问索引值，但是现在该怎么办?

In the JSON below, people has men and women, and men itself has many men with different IDs. So if I have this complete thing as a JSON string, how do I print the value of the ID of a particular man? I could have converted into JArray and access indexed values if there were no nested arrays here, but how to do it now?

这是我的JSON:

{
    "people": [
        {
            "men": [
                {
                    "id": 0,
                    "name": "alex",
                    "age": 25
                },
                {
                    "id": 1,
                    "name": "bob",
                    "age": 26
                },
                {
                    "id": 2,
                    "name": "charlie",
                    "age": 27
                }
            ]
        },
        {
            "women": [
                {
                    "id": 0,
                    "name": "alexys",
                    "age": 25
                },
                {
                    "id": 1,
                    "name": "bethany",
                    "age": 26
                },
                {
                    "id": 2,
                    "name": "catherine",
                    "age": 27
                }
            ]
        }
    ]
}

推荐答案

在顶级JToken中，您可以使用SelectToken()导航到具有您感兴趣的数据的JArray:

From the top-level JToken, you can use SelectToken() to navigate to the JArray that has the data you are interested in:

JToken token = JToken.Parse(json);
JArray men = (JArray)token.SelectToken("people[0].men");

从那里您可以像通常那样处理JArray:

From there you can process the JArray as you normally would:

foreach (JToken m in men)
{
    Console.WriteLine("id: " + m["id"]);
    Console.WriteLine("name: " + m["name"]);
    Console.WriteLine("age: " + m["age"]);
    Console.WriteLine();
}

与女人数组相同，除了SelectToken()路径为people[1].women.

Same thing for the women array, except the SelectToken() path would be people[1].women.

演示: https://dotnetfiddle.net/7BoiUO

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