c# - 从 Json 字符串中提取数据

Question

我得到了一个包含 Json 的字符串。它看起来像这样:

"status_code":200,
"status_txt":"OK",
"data":
{
   "img_name":"D9Y3z.png",
   "img_url":"http:\/\/s1.uploads.im\/D9Y3z.png",
   "img_view":"http:\/\/uploads.im\/D9Y3z.png",
   "img_width":"167",
   "img_height":"288",
   "img_attr":"width=\"167\" height=\"288\"",
   "img_size":"36.1 KB",
   "img_bytes":36981,
   "thumb_url":"http:\/\/s1.uploads.im\/t\/D9Y3z.png",
   "thumb_width":360,
   "thumb_height":360,
   "source":"http:\/\/www.google.com\/images\/srpr\/nav_logo66.png",
   "resized":"0",
   "delete_key":"df149b075ab68c38"
}

我正在尝试获取“img_url”。我安装了 Json.NET，我在这里发现了类似的问题。

例如这样的事情:

JObject o = JObject.Parse("{'People':[{'Name':'Jeff'},{'Name':'Joe'}]}");

// get name token of first person and convert to a string
string name = (string)o.SelectToken("People[0].Name");

在我的例子中，我将 ("People[0].Name") 更改为 ("img_url"),("img_url[0]) 等..没有运气

现在这是我的代码:

public string tempJson { get; set; }
public ActionResult SaveUploadedFile(string test)
{
    using (WebResponse wrs = wrq.GetResponse())
    using (Stream stream = wrs.GetResponseStream())
    using (StreamReader reader = new StreamReader(stream))
    {
        string json = reader.ReadToEnd();
        tempJson = json;
    }
}

在提取值之前，我是否必须对字符串执行某些操作？谢谢!

Answer 1

img_url 不是根对象的属性 - 它是 data 对象的属性:

var obj = JObject.Parse(json);
var url = (string)obj["data"]["img_url"]; // http://s1.uploads.im/D9Y3z.png

另一种选择:

var url = (string)obj.SelectToken("data.img_url");