読むのJSONオブジェクトと私は、次のGET要求を持っていることに

Question

を価値を見つける：

string url = @"http://api.flexianalysis.com/services/flexianalysisservice.svc/TechnicalAnalysisByCategory?clientid=___&category=forex&key=____"; 

     HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url); 
     request.AutomaticDecompression = DecompressionMethods.GZip; 

     using (HttpWebResponse response = (HttpWebResponse)request.GetResponse()) 
     using (Stream stream = response.GetResponseStream()) 
     using (StreamReader reader = new StreamReader(stream)) 
     { 
      rawJson = new StreamReader(response.GetResponseStream()).ReadToEnd(); 
      //html = reader.ReadToEnd(); 
     } 

これはJSONの例である：

[{"ID":133739,"TickerID":23,"CategoryID":3,"ClientID":5044,"TickerDateTime":"2017-11-06T12:57:19.267","TickerTitle":"AUD/USD Intraday: key resistance at 0.7670.\r\n","Category":"Forex","TradePairName":"AUD/USD","Ticker":"AUD","TrendType":"THE upside prevails","Status":"Enabled","TrendValue1":"+1","PivotValue":0.767,"OurPreference":"v: short positions below 0.7670 with targets at 0.7635 & 0.7615 in extension.\r\n","AlternateScenario":"o: above 0.7670 look for further upside with 0.7695 & 0.7715 as targets.\r\n","Comments":" as long as 0.7670 is resistance, look for choppy price action with a bearish bias.\r\n","S1":0.7635,"S2":0.7615,"S3":0.7595,"R1":0.767,"R2":0.7695,"R3":0.7715,"Entry":0.0,"Stop":0.0,"T1":0.0,"T2":0.0},{"ID":133738,"TickerID":193,"CategoryID":3,"ClientID":5044,"TickerDateTime":"2017-11-06T12:55:54.33","TickerTitle":"Dollar Index‏ (ICE) Intraday: bullish bias above 94.8000.\r\n","Category":"Forex","TradePairName":"Dollar Index (ICE)","Ticker":"DXA","TrendType":"THE upside prevails","Status":"Enabled","TrendValue1":"+1""PivotValue":94.8,"OurPreference":": long positions above 94.8000 with targets at 95.1500 & 95.3000 in extension.\r\n","AlternateScenario":"below 94.8000 look for further downside with 94.6500 & 94.4500 as targets.\r\n","Comments":": the RSI lacks downward momentum.","S1":94.8,"S2":94.65,"S3":94.45,"R1":95.15,"R2":95.3,"R3":95.45,"Entry":0.0,"Stop":0.0,"T1":0.0,"T2":0.0}] 

は、その後、私はJSONにそれを解析しようとしていますし、

var json = JObject.Parse(rawJson); 
     var filter = json["d"]; 
     var fff = filter["ID"];//Get the error here 

ここでIDを読み取るが、何らかの理由で子ノードにアクセスできないというエラーが表示されます。 理由は何ですか？

Answer 1

私はあなたの前提のいくつかをチェックし、いくつかのブレークポイントを試す必要があると思います。

それが不完全に形成されているように見えるそのAPIによって返され、あなたが実際に文字列としてJSON配列を受けているJSONを見る：

{"d":"[{\"ID\":133739,\"TickerID\":23,\"CategoryID\":3,...}}, 
     {\"ID\":133740,\"TickerID\":23,\"CategoryID\":3,...}}, 
     [...]}]"} 

このようにそれを解析するために、あなたが最初に取得する必要がありますdパラメータの値を入力し、配列に解析します。

// Get the response from the server 
using (HttpWebResponse response = (HttpWebResponse) request.GetResponse()) 
{ 
    // Pass the response into a stream reader 
    using (StreamReader reader = new StreamReader(response.GetResponseStream())) 
    { 
     // Grab the JSON response as a string 
     string rawJson = reader.ReadToEnd(); 

     // Parse the string into a JObject 
     var json = JObject.Parse(rawJson); 

     // Get the JToken representing the ASP.NET "d" parameter 
     var d = json.GetValue("d"); 

     // Parse the string value of the object into a jArray 
     var jArray = JArray.Parse(d.ToString()); 

     // At this point you can start looking for the items. 
    } 
}