Twitterアクセス​​トークンを要求しているときにリクエストトークンが無効です：C＃

Question

Twitterでサインインする手順3を実行しようとしています。 OAuthアクセストークンのOAuth要求トークンの交換私はステップ1でアクセストークンを受け取りました。ユーザーはステップ2でoauth_verifierを返します。 この手順で表示されるエラーは401 Unauthorized access：無効なリクエストトークンです。

私が間違っていることについてのいくつかの洞察は非常に高く評価されます。

public void Access_Token() 
    { 

     string oauthconsumerkey = ConfigurationManager.AppSettings["t_client_id"]; ; 
     string oauthconsumersecret = ConfigurationManager.AppSettings["t_client_secret"]; 
     string oauthverifier = Request.QueryString["oauth_verifier"]; 
     string oauthtokensecret = string.Empty; 
     string oauthtoken = Request.QueryString["oauth_token"]; 
     string oauthsignaturemethod = "HMAC-SHA1"; 
     string oauthversion = "1.0"; 
     string oauthnonce = HttpUtility.UrlEncode(Guid.NewGuid().ToString("N")); 
     TimeSpan timeSpan = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc); 
     string oauthtimestamp = Convert.ToInt64(timeSpan.TotalSeconds).ToString(); 
     string url = "https://api.twitter.com/oauth/access_token?oauth_verifier=" + Uri.EscapeDataString(oauthverifier); 
     SortedDictionary<string, string> basestringParameters = new SortedDictionary<string, string>(); 
     basestringParameters.Add("oauth_version", oauthversion); 
     basestringParameters.Add("oauth_consumer_key", oauthconsumerkey); 
     basestringParameters.Add("oauth_nonce", oauthnonce); 
     basestringParameters.Add("oauth_signature_method", oauthsignaturemethod); 
     basestringParameters.Add("oauth_timestamp", oauthtimestamp); 

     basestringParameters.Add("oauth_token", EncodeCharacters(oauthtoken)); 


     //Build the signature string 
     StringBuilder baseString = new StringBuilder(); 
     baseString.Append("POST" + "&"); 
     baseString.Append(EncodeCharacters(Uri.EscapeDataString(url.Split('?')[0]) + "&")); 
     foreach (KeyValuePair<string, string> entry in basestringParameters) 
     { 
      baseString.Append(EncodeCharacters(Uri.EscapeDataString(entry.Key + "=" + entry.Value + "&"))); 
     } 

     //Remove the trailing ambersand char last 3 chars - %26 
     string finalBaseString = baseString.ToString().Substring(0, baseString.Length - 3); 

     //Build the signing key 
     string signingKey = EncodeCharacters(Uri.EscapeDataString(oauthconsumersecret)) + "&" + 
EncodeCharacters(Uri.EscapeDataString(oauthtokensecret)); 
     //Sign the request 
     HMACSHA1 hasher = new HMACSHA1(new ASCIIEncoding().GetBytes(signingKey)); 
     string oauthsignature = Convert.ToBase64String(
      hasher.ComputeHash(new ASCIIEncoding().GetBytes(finalBaseString))); 

     //Tell Twitter we don't do the 100 continue thing 
     ServicePointManager.Expect100Continue = false; 
     HttpWebRequest webRequest = (HttpWebRequest)WebRequest.Create(@url); 

     StringBuilder authorizationHeaderParams = new StringBuilder(); 
     authorizationHeaderParams.Append("OAuth "); 
     authorizationHeaderParams.Append("oauth_consumer_key=" + "\"" + Uri.EscapeDataString(oauthconsumerkey) + "\","); 
     authorizationHeaderParams.Append("oauth_nonce=" + "\"" + Uri.EscapeDataString(oauthnonce) + "\","); 
     authorizationHeaderParams.Append("oauth_signature=" + "\"" + Uri.EscapeDataString(oauthsignature) + "\","); 
     authorizationHeaderParams.Append("oauth_signature_method=" + "\"" + Uri.EscapeDataString(oauthsignaturemethod) + "\","); 
     authorizationHeaderParams.Append("oauth_timestamp=" + "\"" + Uri.EscapeDataString(oauthtimestamp) + "\","); 
     authorizationHeaderParams.Append("oauth_token=" + "\"" + Uri.EscapeDataString(oauthtoken) + "\""); 
     authorizationHeaderParams.Append("oauth_version=" + "\"" + Uri.EscapeDataString(oauthversion) + "\""); 
     webRequest.Headers.Add("Authorization", authorizationHeaderParams.ToString()); 


     webRequest.Method = "POST"; 
     webRequest.ContentType = "application/x-www-form-urlencoded"; 



     //Allow us a reasonable timeout in case Twitter's busy 
     webRequest.Timeout = 3 * 60 * 1000; 
     string responseFromServer; 
     try 
     { 
      //webRequest.Proxy = new WebProxy("enter proxy details/address"); 
      HttpWebResponse webResponse = webRequest.GetResponse() as HttpWebResponse; 
      Stream dataStream = webResponse.GetResponseStream(); 
      // Open the stream using a StreamReader for easy access. 
      StreamReader reader = new StreamReader(dataStream); 
      // Read the content. 
      responseFromServer = reader.ReadToEnd(); 
      // responseFromServer; ; 
     } 
     catch (WebException e) 
     { 
      HttpWebResponse errorR = e.Response as HttpWebResponse; 
      Stream dataStream = errorR.GetResponseStream(); 
      // Open the stream using a StreamReader for easy access. 
      StreamReader reader = new StreamReader(dataStream); 
      // Read the content. 
      string dat = responseFromServer = reader.ReadToEnd(); 
     } 

Answer 1

次の行にカンマ（、）を忘れてしまった。

あなたのライン：

authorizationHeaderParams.Append("oauth_version=" + "\"" + Uri.EscapeDataString(oauthversion) + "\""); 

は次のようになります。

authorizationHeaderParams.Append("oauth_version=" + "\"" + Uri.EscapeDataString(oauthversion) + "\",");