使用无效键值访问JArray值：“fields”。 预期数组位置索引

我正在使用监护人API来尝试和检索故事但仍然收到exception。 json的字符串包含下面的json，但是我无法使用LINQ访问正文。

这里是：

{ "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":"..." } }] } } 

我尝试过包括这个在内的所有事情：

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

更新：

 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); } } } 

例外：

System.ArgumentException：使用无效键值访问JArray值：“fields”。 预期数组位置索引。

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

Answer 1

如果你更换

 // 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"]; 

同

 // 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"]; 

这应该适用于你的例子。 请注意在您提供的示例中得到的方括号，表示应在访问代码中考虑的数组。