使用C＃的Google演讲到文本API

Question

我正在使用谷歌语音识别将语音转换为音频文件的文本。我得到的响应输出仅显示{“结果”：[]}。我没有看到任何输出结果。 我从How to use google speech recognition api in c#?和Google speech to text API in C#中选择了我的代码。我在上面的链接中尝试了几乎所有答案，但我仍然收到错误。

我的代码是：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Net;
using System.IO;
using Newtonsoft.Json;

namespace google_api
{
class Program
{
    static void Main(string[] args)
    {
        try
        {

            FileStream fileStream = File.OpenRead("good-morning-google.flac");
            MemoryStream memoryStream = new MemoryStream();
            memoryStream.SetLength(fileStream.Length);
            fileStream.Read(memoryStream.GetBuffer(), 0, (int)fileStream.Length);
            byte[] BA_AudioFile = memoryStream.GetBuffer();
            HttpWebRequest _HWR_SpeechToText = null; 
            _HWR_SpeechToText =
                        (HttpWebRequest)HttpWebRequest.Create(
                            "https://www.google.com/speech-api/v2/recognize?output=json&lang=en-us&key=mykey");
            _HWR_SpeechToText.Credentials = CredentialCache.DefaultCredentials;
            _HWR_SpeechToText.Method = "POST";
            _HWR_SpeechToText.ContentType = "audio/x-flac; rate=44100";
            _HWR_SpeechToText.ContentLength = BA_AudioFile.Length;
            Stream stream = _HWR_SpeechToText.GetRequestStream();
            stream.Write(BA_AudioFile, 0, BA_AudioFile.Length);
            stream.Close();
            HttpWebResponse HWR_Response = (HttpWebResponse)_HWR_SpeechToText.GetResponse();
            if (HWR_Response.StatusCode == HttpStatusCode.OK)
            {
                StreamReader SR_Response = new StreamReader(HWR_Response.GetResponseStream());                           
                Console.WriteLine(SR_Response.ReadToEnd()+SR_Response.ToString());

                string responseFromServer = (SR_Response.ReadToEnd());
                String[] jsons = responseFromServer.Split('\n');
                String text = "";
                foreach (String j in jsons)
                {
                    dynamic jsonObject = JsonConvert.DeserializeObject(j);
                    if (jsonObject == null || jsonObject.result.Count <= 0)
                    {
                        continue;
                    }
                    text = jsonObject.result[0].alternative[0].transcript;
                }
                Console.WriteLine("MESSAGE : "+text);
            }

        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.ToString());
        }

        Console.ReadLine();
    }
}
}