c# - 无法从 Json 对象获取数据

Question

我正在从外部 Web 服务获取一些数据并使用 Newtonsoft.Json.Linq 将其解析为 json

像这样

 JObject o = JObject.Parse(json);
 JArray sizes = (JArray) o["data"];

现在 Sizes 看起来像这样

{
    [
        {
            "post_id": "13334556777742_6456",
            "message": "messagecomes her",
            "attachment": {
                "media": [
                    {
                        "href": "http://onurl.html",
                        "alt": "",
                        "type": "link",
                        "src": "http://myurl.jpg"
                    }
                ],
                "name": "come to my name",
                "href": "http://mydeeplink.html",

                "description": "",
                "properties": [],
            },
        }
    ]
}

我需要从这个 Json 数组中获取 "src": "http://myurl.jpg" 元素。我试过:

foreach (JObject obj in sizes)
{
    JArray media = (JArray)obj["attachment"];
    foreach (JObject obj1 in media)
    {
        var src = obj1["src"];
    }
}

但是它抛出一个错误:

Unable to cast object of type 'Newtonsoft.Json.Linq.JObject' to type 'Newtonsoft.Json.Linq.JArray'.

在这条线上

JArray media = (JArray)obj["attachment"];

有人可以帮我解决这个问题吗？

Answer 1

尝试修复行

JArray media = (JArray)(obj["attachment"]);

到

JArray media = (JArray)(obj["attachment"]["media"]);