Question

我正在尝试从BLS网站请求一组特定的数据：

http://www.bls.gov/developers/api_signature_v2.htm#parameters

在该链接上，我特意试图获得一个带有可选参数的系列。我非常接近，但好像我的JSON帖子请求没有被处理。

static void TryParse()
    {
        //Get JSON data
        using (WebClient wc = new WebClient())
        {
            var json = wc.DownloadString("http://api.bls.gov/publicAPI/v2/timeseries/data/CUUR0000SA0");

            //Deserialize JSON data
            var p1 = new JavaScriptSerializer();
            RootObject j = p1.Deserialize<RootObject>(json);

            RootObject r1 = JsonConvert.DeserializeObject<RootObject>(json);


            //check to see if JSON data was successfully downloaded
            if (r1.ToString() == "Status: REQUEST_SUCCEEDED")
            {

                //Loop through the JSON to find values
                foreach (Datum d in j.Results.series[0].data)
                {
                    //Filters data based on year value
                    if ((Int16.Parse(d.year) == DateTime.Now.Year - 1 && d.period == "M10" )) //|| (Int16.Parse(d.year) == DateTime.Now.Year - 1 && d.period == "M10" )))
                    {
                        octLY = (double.Parse(d.value));
                        Console.WriteLine("OCT14: {0}", octLY);

                        //Console.WriteLine(d.year + " : " + d.period + " : " + d.periodName + " : " + d.value);
                    }

                    if (Int16.Parse(d.year) == DateTime.Now.Year - 2 && d.period == "M10")
                    {
                        oct2y = (double.Parse(d.value));
                        Console.WriteLine("OCT13: {0}", oct2y);

                    }
                    else { }
                }

                Console.WriteLine("CPI: {0}", (octLY - oct2y) / oct2y + 1);
            }

            else
            {
                Console.WriteLine(r1.ToString());
                Console.ReadLine();
            }


            Console.ReadLine();
        }

    }

我在JSON帖子数据中硬编码以完全符合BLS链接上的示例如何显示。问题是它忽略了我的所有参数。尽管要求5等等，我只获得了3年的数据......

可以使用我的身份验证代码，因为这是通用的，稍后会更改。

有人可以告诉我如何使用POST方法请求这些数据吗？我觉得我只是缺少一些基本的东西，但却无法得到它。

仅供参考，如果您要重新创建此问题，它将很容易，因为它是所有开源数据等...但由于它未在请求中看到我的授权，因此它＆＃39 ; s限制用户每天25个请求...所以如果你按原样运行26次...你将收到超出请求的消息。如果这个工作从25次变为500次。

这是我尝试的另一种方法：

{{1}}

Answer 1

使用您的代码重新创建我能够在RootObject类Results.Series集合中获取有效数据。首先，我创建了一个新的Class Called Series Post。

public class SeriesPost 
{
    public string[] seriesid { get; set; }
    public string startyear { get; set; }
    public string endyear { get; set; }
    public bool catalog { get; set; }
    public bool calculations { get; set; }
    public bool annualaverage { get; set; }
    public string registrationKey { get; set; }
}

从那里我稍微修改了你的JSON系列化

using (var streamWriter = new StreamWriter(httpWebRequest.GetRequestStream()))
{
        string newJson = Newtonsoft.Json.JsonConvert.SerializeObject(new SeriesPost()
        {
            seriesid = (new List<string>() { "CUUR0000SA0" }).ToArray(),
            startyear = "2010",
            endyear = "2015",
            catalog = false,
            calculations = true,
            annualaverage = true,
            registrationKey = "f3171173a8ce4b969b5085ba9a83202f"

        });
        //So you can see the JSON thats output
        System.Diagnostics.Debug.WriteLine(newJson);
        streamWriter.Write(newJson);
        streamWriter.Flush();
        streamWriter.Close();
   }
var httpResponse = (HttpWebResponse)httpWebRequest.GetResponse();
        using (var streamReader = new StreamReader(httpResponse.GetResponseStream()))
        {
            var result = streamReader.ReadToEnd();
            //Here your RootObject is the Type thats returned with your results
            RootObject obj = Newtonsoft.Json.JsonConvert.DeserializeObject<RootObject>(result);
            // Loop over the series in the results
            foreach(Series ser in obj.Results.series)
            {
                // Loop over the Data in each of the series.
                foreach(var data in ser.data)
                {
                    //Output the year, in my test I got multiple entries for each year between 2010 to 2015
                    Console.WriteLine(data.year);
                } 
            }
            Console.ReadLine();
        }

如何使用＆＃39; POST＆＃39;使用c＃获取JSON数据的方法？

1 个答案: