C# 签署tumblr api winrt的访问令牌请求

我通过tumblr请求令牌和授权来获取oauth令牌和机密，但是获取访问令牌的最后一步是不断获取错误oauth_签名与预期值不匹配

现在我已经尝试使用POST，GET排序，使用twitter协议。

我甚至尝试使用在第一次请求期间获得的令牌密钥和消费者密钥对请求进行签名

我已经匹配了在初始请求期间获得的令牌和在授权之后获得的令牌，它们都与应该的相同。但有一件事是=授权后获得的aouth验证器的一部分。我用过它，也用过它，没什么区别

谢谢

// the code which is used for getting the access tokens

    private async Task<bool> GetAccessTokensAsync()
        {
            string accesTokenUrl = "https://www.tumblr.com/oauth/access_token";
            string accesTokenUrl2 = "https://www.tumblr.com/oauth/access_token";
            string nonce = GetNonce();
            string timeStamp = GetTimeStamp();
            string BaseParameters = "oauth_consumer_key=" + aouthKey;
            BaseParameters += "&" + "oauth_nonce=" + nonce;
            BaseParameters += "&" + "oauth_signature_method=HMAC-SHA1";
            BaseParameters += "&" + "oauth_timestamp=" + timeStamp;
            BaseParameters += "&" + "oauth_token=" +"oauth token got after authorization";

            BaseParameters += "&" + "oauth_version=1.0";
            String protocol = "GET&";
            protocol += Uri.EscapeDataString(accesTokenUrl) + "&" + Uri.EscapeDataString(BaseParameters);
            string signature = GetSignature(protocol, aouthSecret);

HttpStringContent httpContent = new HttpStringContent("oauth_verifier=" + Uri.EscapeDataString("oauth verifier got after authorization"), Windows.Storage.Streams.UnicodeEncoding.Utf8);
            httpContent.Headers.ContentType = Windows.Web.Http.Headers.HttpMediaTypeHeaderValue.Parse("application/x-www-form-urlencoded");
            string authparams = "oauth_consumer_key=\"" + aouthKey + "\", oauth_nonce=\"" + nonce + "\", oauth_signature_method=\"" + "HMAC-SHA1" + "\", oauth_signature=\"" + Uri.EscapeDataString(signature) + "\", oauth_timestamp=\"" + timeStamp + "\", oauth_token=\"" + Uri.EscapeDataString("oauth token got after authorization") + "\", oauth_version=\"1.0\"";

            HttpClient client = new HttpClient();
            client.DefaultRequestHeaders.Authorization = new Windows.Web.Http.Headers.HttpCredentialsHeaderValue("OAuth", authparams);
            HttpResponseMessage respMe = await client.PostAsync(new Uri(accesTokenUrl),httpContent);
            string response = await respMe.Content.ReadAsStringAsync();
            Debug.WriteLine("response is " + response);

}

// the consumer key, consumer secret and the callback url.


     string aouthKey = "######";
       string aouthSecret = "####";
       string callbackURL = "https://localhost";

//function for getting the nonce


     string GetNonce()
            {
                Random rand = new Random();
                int nonce = rand.Next(1000000000);

                return nonce.ToString();
            }

//function for generating the timestamp


     string GetTimeStamp()
            {
                TimeSpan SinceEpoch = DateTime.UtcNow - new DateTime(1970, 1, 1);
                return Math.Round(SinceEpoch.TotalSeconds).ToString();
            }



// function for generating the signature from microsofts examples.


     string GetSignature(string sigBaseString, string consumerSecretKey)
            {
                IBuffer KeyMaterial = CryptographicBuffer.ConvertStringToBinary(consumerSecretKey + "&", BinaryStringEncoding.Utf8);
                MacAlgorithmProvider HmacSha1Provider = MacAlgorithmProvider.OpenAlgorithm("HMAC_SHA1");
                CryptographicKey MacKey = HmacSha1Provider.CreateKey(KeyMaterial);
                IBuffer DataToBeSigned = CryptographicBuffer.ConvertStringToBinary(sigBaseString,BinaryStringEncoding.Utf8);
                IBuffer SignatureBuffer = CryptographicEngine.Sign(MacKey, DataToBeSigned);
                string Signature = CryptographicBuffer.EncodeToBase64String(SignatureBuffer);

                return Signature;
            }