问怎么用C#请求TextToVoice？

使用C#httpwebrequest请求接口返回code提示缺少参数version，但我已经添加过version了，我再把url拷贝到浏览器上运行又提示signature错误，请问是什么原因？

部分代码

static void Main(string[] args)

{

string url = "https://aai.tencentcloudapi.com";

SortedDictionary<string, string> dic = new SortedDictionary<string, string>();

dic.Add("Action", "TextToVoice");

dic.Add("Version", "2018-05-22");

dic.Add("Region", "ap-beijing");

dic.Add("Text", "测试文本");

dic.Add("SessionId", "sessionid-1234");

dic.Add("ModelType", "1");

dic.Add("Timestamp", GetCurrentTimeUnix(0));

//dic.Add("Expired", GetCurrentTimeUnix(3600));

dic.Add("Nonce", "555555");

dic.Add("SecretId", "AKIDTp25wciVikbHn7lDymRwFNJ3czA9qRUP");

StringBuilder builder = new StringBuilder();

builder.Append("https://aai.tencentcloudapi.com/?");

int i = 0;

foreach (var item in dic)

{

if (i > 0)

{

builder.Append("&");

}

builder.AppendFormat("{0}={1}", item.Key, item.Value);

i++;

}

string miwen = HmacSha1AndBase64(builder.ToString(), "077RbcS6YovrdDcrvmX7WlxyoSuDKJ7j");

Console.WriteLine(builder.ToString());

Console.WriteLine(miwen);

dic.Add("Signature", miwen);

builder.Append("&Signature="+miwen);

Console.WriteLine(Post(builder.ToString()));

Console.ReadKey();

Console.WriteLine(Post(builder.ToString()));

Console.ReadKey();

}

public static string HmacSha1AndBase64(string mk, string secretkey)

{

HMACSHA1 hmacsha1 = new HMACSHA1();

hmacsha1.Key = Encoding.UTF8.GetBytes(secretkey);

byte[] dataBuffer = Encoding.UTF8.GetBytes(mk);

byte[] hashBytes = hmacsha1.ComputeHash(dataBuffer);

return Convert.ToBase64String(hashBytes);

}

//获取时间戳

public static string GetCurrentTimeUnix(int second)

{

//设置时间戳

DateTime dt = new DateTime(1970, 1, 1, 0, 0, 0, DateTimeKind.Local);

long time = (int)(DateTime.Now.AddHours(-8) - dt).TotalSeconds+second;

String Timestamp = time.ToString();

return Timestamp;

}

//带键值对的post方法

public static string Post(string url)

{

/*

* 定义httprequest链接

* */

HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);

/*

* 设置httprequest属性

* */

request.Method = "POST";

request.ContentType = "application/json";

request.Headers.Add("Authorization", "VVerIEkz2OAuSBdNtH6W2M1xal0=");

/*

* 定义httpresponse

* */

HttpWebResponse response = (HttpWebResponse)request.GetResponse();

/*

* 接收response的数据

* */

string returnresult = string.Empty;

using (Stream stream = response.GetResponseStream())

{

using (StreamReader sr = new StreamReader(stream, Encoding.UTF8))

{

returnresult = sr.ReadToEnd();

sr.Close();

}

stream.Close();

}

return returnresult;

}