访问JArray值无效键值："&领域;. QUOT阵列位置索引预期 [英] Accessed JArray values with invalid key value: "fields". Array position index expected

问题描述

我使用的监护人API，试图找回故事，但不断收到一个例外。 ，JSON的字符串包含以下JSON，但是我不能访问使用LINQ身体

下面是：

  {
回应：{
地位：OK，
userTier：经批准，
总：1，
的startIndex：1，
的pageSize：10，
当前页：1，
页：1，$ b $ [{
标识：可持续发展的商业/可持续发展 - 融资 - 在那里，旁边开线程，
b排序依据：最新，
结果 sectionId：可持续经营，
sectionName：卫报可持续发展业务，
webPublicationDate：2014-02-13T13：27：00Z，
webTitle ：凡其次为可持续金融 - 开线程？，
WEBURL：http://www.theguardian.com/sustainable-business/sustainable-finance-where-next-open-thread，
apiUrl：http://content.guardianapis.com/sustainable-business/sustainable-finance-where-next-open-thread，
田：{
体：&下; IMG SRC = \http://hits.theguardian.com/b/ss/guardiangu-api/1/H.20.3/98867?ns=guardian&pageName=Where+next+for +持续+财务％3F +  -  +开放+主题+文章+ 2043222&放大器;放大器; CH =卫+可持续+商业与放大器; C2 = 461773&放大器;放大器; C4 = MIC％3A +财务+％28GSB％29％2CMIC％3A +卫+可持续+商务％2CPRO％3A +可持续性+％28Guardian +专业％29&放大器;放大器; C3 = theguardian.com&放大器;放大器; C6 =劳拉+ Paddison&放大器;放大器; C7 = 14  -  2月 -  13放大器;放大器; C8 = 2043222&安培;放大器; C9 = Article\WIDTH = \1\HEIGHT = \1\/> ...
} 
}] 
 $} b $ b} 
  

我曾尝试每一件事情，包括这样的：

 字符串故事=（字符串）JA [回应] [成果] [字段] [身体]; 
  

更新：

 公共部分类故事：的PhoneApplicationPage 
 {
字符串URL; 
串jsonData; 
 
 // HTTP上使用这样的JSON可以通过get异步方法$ B $被retrived b HttpClient的Web客户端=新的HttpClient（）; 
 
保护覆盖无效的OnNavigatedTo（NavigationEventArgs E）
 {
如果（NavigationContext.QueryString.ContainsKey（钥匙））
 {
串encodedValue = NavigationContext.QueryString [钥匙]; 
 URL = Uri.UnescapeDataString（encodedValue）; 
 textBox.Text =网址; 
 guardianPanorama（）; 
} 
} 
私人异步无效guardianPanorama（）
 {
试
 {
 HttpResponseMessage结果=等待webClient.GetAsync（URL）; 
 
 //这需要HTTP响应内容，并变成一个字符串
 jsonData =等待Result.Content.ReadAsStringAsync（）; 
 
 JObject JA = JObject.Parse（jsonData）; 
 
 //这对当前比特币价格和格式它因此有小数位
串的故事=（字符串）JA [回应]的正确用量[成果] [ 田] [身体]; 
 
 //然后，它被添加到文本框
 textBox.Text =故事; 
} 
赶上（例外错误）
 {
 MessageBox.Show（我们一直与卫API一个错误）; 
 Console.WriteLine（时出现错误：+错误）; 
} 
} 
} 
  

例外：

System.ArgumentException：访问的JArray值无效键值：田。阵列位置索引的预期。

在Newtonsoft.Json.Linq.JArray.get_Item（对象键）

解决方案

如果您替换

  //这需要电流比特币的价格和格式它因此有小数位
串的故事=（字符串）JA [回应] [成果] [字段]的正确用量[身体]; 
  

与

  //这对当前比特币价格和格式它因此有小数位
串的故事=（字符串）JA [回应] [成果]的正确用量[0] [域] [身体]; 
  

这应该为你的榜样工作。请注意您所提供的示例结果后，方括号，这表示应该占您的访问代码的数组。

I am using the guardian API to try and retrieve stories but keep receiving an exception. The string of json contains the below json, however I can't access the body using LINQ.

Here it is:

{
    "response":{
    "status":"ok",
    "userTier":"approved",
    "total":1,
    "startIndex":1,
    "pageSize":10,
    "currentPage":1,
    "pages":1,
    "orderBy":"newest",
    "results":[{
      "id":"sustainable-business/sustainable-finance-where-next-open-thread",
      "sectionId":"sustainable-business",
      "sectionName":"Guardian Sustainable Business",
      "webPublicationDate":"2014-02-13T13:27:00Z",
      "webTitle":"Where next for sustainable finance? - open thread",
      "webUrl":"http://www.theguardian.com/sustainable-business/sustainable-finance-where-next-open-thread",
      "apiUrl":"http://content.guardianapis.com/sustainable-business/sustainable-finance-where-next-open-thread",
      "fields":{
        "body":"<img src=\"http://hits.theguardian.com/b/ss/guardiangu-api/1/H.20.3/98867?ns=guardian&amp;pageName=Where+next+for+sustainable+finance%3F+-+open+thread+Article+2043222&amp;ch=Guardian+Sustainable+Business&amp;c2=461773&amp;c4=MIC%3A+Finance+%28GSB%29%2CMIC%3A+Guardian+Sustainable+Business%2CPRO%3A+Sustainability+%28Guardian+Professional%29&amp;c3=theguardian.com&amp;c6=Laura+Paddison&amp;c7=14-Feb-13&amp;c8=2043222&amp;c9=Article\" width=\"1\" height=\"1\" />..."
      }
     }]
     }
}

I have tried every thing including this:

string story = (string)ja["response"]["results"]["fields"]["body"];

Update:

public partial class Story : PhoneApplicationPage
{
    string url;
    string jsonData;

    // Http used so the json can be retrived via the get async methods
    HttpClient webClient = new HttpClient();

    protected override void OnNavigatedTo(NavigationEventArgs e)
    {
        if (NavigationContext.QueryString.ContainsKey("key"))
        {
            string encodedValue = NavigationContext.QueryString["key"];
            url = Uri.UnescapeDataString(encodedValue);
            textBox.Text = url;
            guardianPanorama();
        }
    }
    private async void guardianPanorama()
    {
        try
        {
            HttpResponseMessage Result = await webClient.GetAsync(url);

            // This takes the http response content and is turned into a string
            jsonData = await Result.Content.ReadAsStringAsync();

            JObject ja = JObject.Parse(jsonData);

            // This takes the current bitcoin price and formats it so there is the      correct amount of decimal places
            string story = (string)ja["response"]["results"]["fields"]["body"];

            // It then gets added to the textbox
            textBox.Text = story;
        }
        catch (Exception errors)
        {
            MessageBox.Show("There has been a error with the Guardian API");
            Console.WriteLine("An error occured:" + errors);
        }
    }
}

Exception:

System.ArgumentException: Accessed JArray values with invalid key value: "fields". Array position index expected.

at Newtonsoft.Json.Linq.JArray.get_Item(Object key)

解决方案

If you replace

// This takes the current bitcoin price and formats it so there is the correct amount of decimal places
string story = (string)ja["response"]["results"]["fields"]["body"];

with

// This takes the current bitcoin price and formats it so there is the correct amount of decimal places
string story = (string)ja["response"]["results"][0]["fields"]["body"];

that should work for your example. Note the square bracket after results in the example you provided, that indicates an array that should be accounted for in your access code.

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