Develop Reference

Unauthorized Access Exception While Using Yahoo Weather API

I have done code to access yahoo weather API with oath by following all steps provided by yahoo in documentation as
1) Create Yahoo account
2) Create App
3) White list App
4) C# code to access yahoo weather API with oath
I am getting Unauthorized access exception while requesting API.
Here is the code :
public class WeatherYdn
{
public static void Main(string[] args)
{
const string appId = "YOUR-WHITELISTED-APPID";
const string consumerKey = "YOUR-CONSUMER-KEY";
const string consumerSecret = "YOUR-SECRET-KEY";
const string url = "https://weather-ydn-yql.media.yahoo.com/forecastrss";
string timestamp = StringHelper.GenerateTimeStamp();
String oauthNonce = StringHelper.GenerateNonce();
IList<string> parameters = new List<string>();
parameters.Add("oauth_consumer_key=" + consumerKey);
parameters.Add("oauth_nonce=" + oauthNonce);
parameters.Add("oauth_signature_method=HMAC-SHA1");
parameters.Add("oauth_timestamp=" + timestamp);
parameters.Add("oauth_version=1.0");
// Make sure value is encoded
parameters.Add("location=" + HttpUtility.UrlEncode("pune,in", Encoding.UTF8));
parameters.Add("format=json");
((List<string>) parameters).Sort();
StringBuilder parametersList = new StringBuilder();
for (int i = 0; i < parameters.Count; i++)
{
parametersList.Append(((i > 0) ? "&" : "") + parameters.ElementAt(i));
}
var signatureString = "GET&" +
HttpUtility.UrlEncode(url,Encoding.UTF8) + "&" +
HttpUtility.UrlEncode(parametersList.ToString(), Encoding.UTF8);
string signature = null;
try
{
string secretAccessKey = consumerSecret;
byte[] secretKey = Encoding.UTF8.GetBytes(secretAccessKey);
HMACSHA1 hmac = new HMACSHA1(secretKey);
hmac.Initialize();
byte[] bytes = Encoding.UTF8.GetBytes(signatureString);
byte[] rawHmac = hmac.ComputeHash(bytes);
signature = Convert.ToBase64String(rawHmac);
}
catch (Exception e)
{
Console.WriteLine("Unable to append signature");
}
string authorizationLine = "OAuth " +
"oauth_consumer_key=\"" + consumerKey + "\", " +
"oauth_nonce=\"" + oauthNonce + "\", " +
"oauth_timestamp=\"" + timestamp + "\", " +
"oauth_signature_method=\"HMAC-SHA1\", " +
"oauth_signature=\"" + signature + "\", " +
"oauth_version=\"1.0\"";
HttpWebRequest request = (HttpWebRequest) WebRequest.Create(url + "?location=pune,in&format=json");
request.Headers.Add("Authorization", authorizationLine);
request.Headers.Add("Yahoo-App-Id", appId);
request.ContentType = "application/json; charset=UTF-8";
request.Accept = "application/json";
HttpWebResponse response = (HttpWebResponse) request.GetResponse();
Stream receiveStream = response.GetResponseStream();
StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);
Console.WriteLine(readStream.ReadLine());
}
}

In which line you get the error? The GetResponse() returns it?
I think that the credentials you are using (appId,consumerKey,consumerSecret) are invalid!

public string appId = "Your app-id";
public string consumerKey = "Your-consumer key";
public string consumerSecret = "Your Consumer Secret key";
// GET: api/Random
[HttpGet("{CityName}")]
public async Task<IActionResult> GetAsync([FromUri] string CityName)
{
string urlss = "https://weather-ydn-yql.media.yahoo.com/forecastrss?location=";
string url = urlss + CityName+ "&format=json&u=c";
JObject jresult;
using (var client = new HttpClient())
{
try
{
var webClient = new WebClient();
webClient.Headers.Add(AssembleOAuthHeader());
var d = webClient.DownloadString(url);
jresult = JObject.Parse(d);
var json_jsonstring = Newtonsoft.Json.JsonConvert.SerializeObject(jresult);
return Ok(json_jsonstring);
}
catch (HttpRequestException httpRequestException)
{
return BadRequest($"Error getting weather from Yahoo Weather: {httpRequestException.Message}");
}
}
}
public string AssembleOAuthHeader()
{
return "Authorization: OAuth " +
"realm=\"yahooapis.com\"," +
"oauth_consumer_key=\"" + consumerKey + "\"," +
"oauth_nonce=\"" + Guid.NewGuid() + "\"," +
"oauth_signature_method=\"PLAINTEXT\"," +
"oauth_timestamp=\"" + ((DateTime.UtcNow.Ticks - new DateTime(1970, 1, 1).Ticks) / (1000 * 10000)) +
"\"," +
"oauth_version=\"1.0\"," +
"oauth_signature=\"" + consumerSecret + "%26\"," +
"oauth_callback=\"oob\"";
}

For yahoo weather new authentication you can use this python library
yahoo-weather

I think your code is fine. The problem lies with a poorly implemented URL Decode on Yahoo's end. Java URL Encode encodes with uppercase while .net HTTPUtility.URLEncode encodes in lower case. I created an extension method for a string that will rectify the problem and URL Encode in a way that the Yahoo API can handle. After doing that all worked well (I had the exact same problem you did).
<Extension>
Public Function UppercaseURLEncode(ByVal sourceString As String) As String
Dim temp As Char() = HttpUtility.UrlEncode(sourceString).ToCharArray()
For i As Integer = 0 To temp.Length - 2
If temp(i).ToString().Equals("%", StringComparison.OrdinalIgnoreCase) Then
temp(i + 1) = Char.ToUpper(temp(i + 1))
temp(i + 2) = Char.ToUpper(temp(i + 2))
End If
Next
Return New String(temp)
End Function

//Here Is The Working Code :
public class YWSample
{
const string cURL = "https://weather-ydn-yql.media.yahoo.com/forecastrss";
const string cAppID = "Your-App-ID";
const string cConsumerKey = "Your-Consumer-Key";
const string cConsumerSecret = "Your-Consumer-Secret";
const string cOAuthVersion = "1.0";
const string cOAuthSignMethod = "HMAC-SHA1";
const string cWeatherID = "woeid=727232"; // Amsterdam, The Netherlands
const string cUnitID = "u=c"; // Metric units
const string cFormat = "xml";
//Code to get timestamp
static string _get_timestamp()
{
var lTS = DateTime.UtcNow - new DateTime(1970, 1, 1, 0, 0, 0, 0, DateTimeKind.Utc);
return Convert.ToInt64(lTS.TotalSeconds).ToString();
}
//Code to get nonce
static string _get_nonce()
{
return Convert.ToBase64String(
new ASCIIEncoding().GetBytes(
DateTime.Now.Ticks.ToString()
)
);
} // end _get_nonce
static string _get_auth()
{
var lNonce = _get_nonce();
var lTimes = _get_timestamp();
var lCKey = string.Concat(cConsumerSecret, "&");
var lSign = $"format={cFormat}&" + $"oauth_consumer_key={cConsumerKey}&" + $"oauth_nonce={lNonce}&" +
$"oauth_signature_method={cOAuthSignMethod}&" + $"oauth_timestamp={lTimes}&" +
$"oauth_version={cOAuthVersion}&" + $"{cUnitID}&{cWeatherID}";
lSign = string.Concat(
"GET&", Uri.EscapeDataString(cURL), "&", Uri.EscapeDataString(lSign)
);
using (var lHasher = new HMACSHA1(Encoding.ASCII.GetBytes(lCKey)))
{
lSign = Convert.ToBase64String(
lHasher.ComputeHash(Encoding.ASCII.GetBytes(lSign))
);
} // end using
return "OAuth " +
"oauth_consumer_key=\"" + cConsumerKey + "\", " +
"oauth_nonce=\"" + lNonce + "\", " +
"oauth_timestamp=\"" + lTimes + "\", " +
"oauth_signature_method=\"" + cOAuthSignMethod + "\", " +
"oauth_signature=\"" + lSign + "\", " +
"oauth_version=\"" + cOAuthVersion + "\"";
} // end _get_auth
public static void Main(string[] args)
{
const string lURL = cURL + "?" + cWeatherID + "&" + cUnitID + "&format=" + cFormat;
var lClt = new WebClient();
lClt.Headers.Set("Content-Type", "application/" + cFormat);
lClt.Headers.Add("Yahoo-App-Id", cAppID);
lClt.Headers.Add("Authorization", _get_auth());
Console.WriteLine("Downloading Yahoo weather report . . .");
var lDataBuffer = lClt.DownloadData(lURL);
var lOut = Encoding.ASCII.GetString(lDataBuffer);
Console.WriteLine(lOut);
Console.Write("Press any key to continue . . . ");
Console.ReadKey(true);
}//end of Main
} // end YWSample

How to fetch Json value and fill it on dataset in ASP.NET

I am trying to fetch JSON value but failed to retrieve value and fill on DataSet and bind them on GridView and I am getting null value.
Here I have tried code please seen below:
var outputValue = cpmu.getCPMUdata(AgreementNo, AgreementedBy, YearOfAgreement);
var serializer = new JavaScriptSerializer();
dynamic obj = serializer.Deserialize<dynamic>(outputValue);
var data = obj["data"];
StringReader theReader = new StringReader(data);
DataSet theDataSet = new DataSet();
theDataSet.ReadXml(theReader);
var result = theDataSet.Tables[0];
Label3.Text = theDataSet.Tables[0].Rows[0].Field<string>("AgreementNo");
Label2.Text = theDataSet.Tables[0].Rows[0].Field<string>("Agreementby");
Label4.Text = theDataSet.Tables[0].Rows[0].Field<string>("YearofAgreement");
GridView2.DataSource = theDataSet;
GridView2.DataMember = theDataSet.Tables["Bill"].ToString();
GridView2.DataBind();
JSON code:
public string getCPMUdata(string AgreementNo, string Agreementby, string YearofAgreement)
{
//Code to accept the SSL server certificate
ServicePointManager.ServerCertificateValidationCallback = new System.Net.Security.RemoteCertificateValidationCallback(AcceptAllCertifications);
//Configuration Values
string strbaseUrl = System.Configuration.ConfigurationManager.AppSettings["baseUrl"];
string strLoginBaseUrl = System.Configuration.ConfigurationManager.AppSettings["LoginBaseUrl"];
String username = System.Configuration.ConfigurationManager.AppSettings["UserName"];
string password = System.Configuration.ConfigurationManager.AppSettings["Password"];
//***************
/* Input Values */
string strAgreementNo = AgreementNo;
string strAgreementby = Agreementby;
string strYearofAgreement = YearofAgreement;
/****************/
// Initialize the response
string returnvalue = string.Empty;
HttpWebResponse response = null;
HttpWebRequest request = null;
String responseText = null;
String authorization;
try
{
//Create the Request Url
String requestUrl = strLoginBaseUrl + "?service=" + HttpUtility.UrlEncodeUnicode(strbaseUrl + "/3DSpace/resources/CHiPSCPMSBillDetailsModeler/CHiPSCPMSBillDetails?AgreementNo=" + HttpUtility.UrlEncode(strAgreementNo) + "&Agreementby=" + HttpUtility.UrlEncode(strAgreementby) + "&YearofAgreement=" + HttpUtility.UrlEncode(strYearofAgreement));
request = WebRequest.Create(requestUrl) as HttpWebRequest;
request.Method = "GET";
request.ContentType = "application/json";
authorization = System.Convert.ToBase64String(Encoding.UTF8.GetBytes(username + ":" + password));
request.Headers.Add("Authorization", "Basic " + authorization);
response = request.GetResponse() as HttpWebResponse;
if (request.HaveResponse == true && response == null)
{
String msg = "response was not returned or is null";
throw new WebException(msg);
}
if (response.StatusCode != HttpStatusCode.OK)
{
String msg = "response with status: " + response.StatusCode + " " + response.StatusDescription;
throw new WebException(msg);
}
// get the first HTTP response content
StreamReader reader = new StreamReader(response.GetResponseStream(), Encoding.UTF8);
responseText = reader.ReadToEnd();
//extract the LT code from the response string
String lt = "";
lt = responseText.Substring(responseText.LastIndexOf("\"lt\""));
lt = lt.Substring(0, lt.IndexOf(","));
lt = lt.Replace("\"lt\":", ",");
lt = lt.Replace("\"", "");
lt = lt.Replace("\"", "");
lt = lt.Replace(",", "");
//Extract Session ID from the response header
String strJsonId = "";
strJsonId = response.Headers["Set-Cookie"];
strJsonId = response.Headers["Set-Cookie"].Substring(strJsonId.LastIndexOf("JSESSIONID"));
strJsonId = strJsonId.Substring(0, strJsonId.IndexOf(";"));
strJsonId = strJsonId.Replace("JSESSIONID", "");
strJsonId = strJsonId.Replace("=", "");
strJsonId = strJsonId.Trim();
//throw exception if access token or sessionid is not available
if (lt == "" && strJsonId == "")
{
String msg = "Unable to retrieve Access Token and session Key";
throw new WebException(msg);
}
//Second HTTP Request to get the Data based on the 'lt' token, 'SessionID' and Query String parameters
WebRequest requestLast = WebRequest.Create(requestUrl);
requestLast.Headers.Add("Cookie", "JSESSIONID=" + strJsonId);
requestLast.Method = "POST";
string postData = "lt=" + lt + "&username=" + username + "&password=" + password;
byte[] byteArray = Encoding.UTF8.GetBytes(postData);
// Set the ContentType property of the WebRequest.
requestLast.ContentType = "application/x-www-form-urlencoded";
requestLast.ContentLength = byteArray.Length;
// Get the request stream.
Stream dataStream1 = requestLast.GetRequestStream();
dataStream1.Write(byteArray, 0, byteArray.Length);
dataStream1.Close();
// Get the response.
WebResponse responseLast = requestLast.GetResponse();
dataStream1 = responseLast.GetResponseStream();
StreamReader reader1 = new StreamReader(dataStream1);
returnvalue = reader1.ReadToEnd();
// Clean up the streams.
reader.Close();
reader1.Close();
dataStream1.Close();
response.Close();
responseLast.Close();
}
catch (WebException e)
{
if (e.Response != null)
{
response = (HttpWebResponse)e.Response;
returnvalue = response.StatusCode + " " + response.StatusDescription;
}
else
{
returnvalue = e.Message;
}
}
finally
{
if (response != null)
{
response.Close();
}
}
return returnvalue;
}
public static bool AcceptAllCertifications(object sender, System.Security.Cryptography.X509Certificates.X509Certificate certification, System.Security.Cryptography.X509Certificates.X509Chain chain, System.Net.Security.SslPolicyErrors sslPolicyErrors)
{
return true;
}
}
Here in variable returnvalue, I get such type of error:
{"msg":"error","data":" NA
</AgreementNo> NA </Agreementby> NA
</YearofAgreement> \t\t No Data Found\t\t
</Bill>\t\t </xml>"}

Facebook active token failure C# HttpWebRequest

I obtain an access_token OK from Facebook, but whenever I try to use it, it fails (bad request).
It looks like the access_token is not being sent to the server correctly. I have used Server.UrlEncode to encode it.
Any ideas what I am doing wrong?
string ourAccessToken = "unknown";
//--------------------------------------
protected void Page_Load(object sender, EventArgs e)
{
getAccessToken();
getMe();
}
// -----------------------
private void getAccessToken()
{
string result = "unknown";
try
{
// get app access token
string thisURL = "https://graph.facebook.com/oauth/access_token";
thisURL += "?client_id=" + ourClientID;
thisURL += "&client_secret=" + ourClientSecret;
thisURL += "&grant_type=client_credentials";
thisURL += "&redirect_uri=" + Server.UrlEncode(ourSiteRedirectURL);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create( thisURL);
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
HttpStatusCode rc = response.StatusCode;
if( rc == HttpStatusCode.OK)
{
StreamReader Sreader = new StreamReader( response.GetResponseStream());
result = Sreader.ReadToEnd();
Sreader.Close();
}
response.Close();
}
catch (Exception exc)
{
result = "ERROR : " + exc.ToString();
}
Response.Write( "<br>result=[" + result + "]");
// extract accessToken
string accessToken = "";
int equalsAt = result.IndexOf( "=");
if( equalsAt >= 0 && result.Length > equalsAt) accessToken = (result.Substring( equalsAt + 1)).Trim();
Response.Write( "<br>accessToken=[" + accessToken + "]");
ourAccessToken = accessToken;
}
// -----------------------
private void getMe()
{
string result = "unknown";
try
{
string thisURL = "https://graph.facebook.com/me?access_token=" + Server.UrlEncode(ourAccessToken);
Response.Write("<br>thisURL=" + thisURL);
HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create( thisURL);
request.Method = "GET";
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
HttpStatusCode rc = response.StatusCode;
if( rc == HttpStatusCode.OK)
{
StreamReader Sreader = new StreamReader( response.GetResponseStream());
result = Sreader.ReadToEnd();
Sreader.Close();
}
response.Close();
}
catch (Exception ex)
{
Response.Write("<br>getMe Exc: " + ex.Message.ToString() + "<br>");
}
Response.Write("<br>getMe result = " + result + "<br><br>");
}
Thanks

Right settings in App-Dashboard? If you active "Native/Desktop" you can not send API-Calls with this method, see:
https://developers.facebook.com/docs/facebook-login/access-tokens?locale=en_US#apptokens

After a lot of trial and error, I conclude that an App Access Token is not relevant, and that the ClientID and ClientSecret should be used directly. I want my App to generate a set of photographs of registered users. Because the server is making the call, there is no meaning to "me". A set of data can be obtained by preparing a batch process:
string p1 = "access_token=" + Server.UrlEncode(ourClientID + "|" + ourClientSecret);
string p2 = "&batch=" +
Server.UrlEncode( " [ { \"method\": \"get\", \"relative_url\": \"" + chrisFBID + "?fields=name,picture.type(square)\" }, " +
" { \"method\": \"get\", \"relative_url\": \"" + johnFBID + "?fields=name,picture.type(large)\" }, " +
" { \"method\": \"get\", \"relative_url\": \"" + stephFBID + "?fields=name,picture.type(large)\" } ]");
string responseData = "";
try
{
HttpWebRequest httpRequest = (HttpWebRequest)WebRequest.Create("https://graph.facebook.com/");
httpRequest.Method = "POST";
httpRequest.ContentType = "application/x-www-form-urlencoded";
byte[] bytedata = Encoding.UTF8.GetBytes(p1 + p2);
httpRequest.ContentLength = bytedata.Length;
Stream requestStream = httpRequest.GetRequestStream();
requestStream.Write(bytedata, 0, bytedata.Length);
requestStream.Close();
HttpWebResponse httpWebResponse = (HttpWebResponse)httpRequest.GetResponse();
Stream responseStream = httpWebResponse.GetResponseStream();
StreamReader reader = new StreamReader(responseStream, System.Text.Encoding.UTF8);
responseData = reader.ReadToEnd();
}
catch (Exception ex)
{
Response.Write(ex.Message.ToString() + "<br>");
}
Response.Write("<br>" + responseData + "<br><br>");
I also conclude that the FB documentation suffers from the usual fatal flaw of documentation: it has been written by an expert and never tested on a novice user before release.

Why Yammer Post Message Error 500?

While posting messages, Yammer is throwing the following error (and not posting the message):
The remote server returned an error: (500) Internal Server Error.
I'm using Yammer .NET wrapper and it's working fine with REST call "https://www.yammer.com/api/v1/messages.json", but posting message gives the above error.
Below is the code giving us the error message,
String consumerkey = "consumerkey";
String clientsecret = "clientsecret";
WebProxy webpro = new WebProxy("ourproxyserver",8080)
webpro.BypassProxyOnLocal = true;
webpro.Credentials = CredentialCache.DefaultCredentials;
String access_token = "https://www.yammer.com/oauth2/access_token.json"+
"?client_id=clientid&"+
"client_secret=cli_secret&code=code_id";
Yammer.Session session = new Yammer.Session(
new OAuth.OAuthKey(
consumerkey, clientsecret, access_token,"token"
),
webpro);
NameValueCollection parameters = new NameValueCollection();
parameters.Add("body", body);
response = Yammer.HttpUtility.Post(Resources.YAMMER_MESSAGES_CREATE, parameters, session);
Any ideas what could be wrong?

You can try following wrapper method to post message on yammer (Please note that this code uses Auth and Authbase class:
public static string PostMessage(string body)
{
NameValueCollection parameters = new NameValueCollection();
parameters.Add("body", body);
string response = string.Empty;
response = Post("https://www.yammer.com/api/v1/messages/", parameters);
return response;
}
public static string Post(string url, NameValueCollection parameters)
{
string nonce, timestamp;
string fullUrl = EncodeUrl(url, parameters);
string signature = GetSignature(WebMethod.POST, fullUrl, out timestamp, out nonce);
HttpWebRequest request = CreateWebRequest(url, WebMethod.POST, nonce, timestamp, signature);
int count = 0;
string queryString = string.Empty;
foreach (string key in parameters.Keys)
{
if (count == 0)
queryString = key + "=" + Rfc3986.Encode(parameters[key]);
else
queryString += "&" + key + "=" + Rfc3986.Encode(parameters[key]);
count++;
}
byte[] postDataBytes = Encoding.ASCII.GetBytes(queryString);
request.ContentLength = postDataBytes.Length;
Stream reqStream = request.GetRequestStream();
reqStream.Write(postDataBytes, 0, postDataBytes.Length);
reqStream.Close();
WebResponse response = null;
string data = string.Empty;
try
{
response = request.GetResponse();
data = response.Headers["Location"];
}
catch (Exception ex)
{
//System.Windows.Forms.MessageBox.Show("Error retrieving web response " + ex.Message);
throw ex;
}
finally
{
if (response != null)
response.Close();
}
return data;
}
private static string EncodeUrl(string url, NameValueCollection parameters)
{
string fullUrl = string.Empty;
int count = 0;
foreach (string key in parameters.Keys)
{
if (count == 0)
fullUrl = url + "?" + key + "=" + Rfc3986.Encode(parameters[key].ToLower());
else
fullUrl += "&" + key + "=" + Rfc3986.Encode(parameters[key].ToLower());
count++;
}
return fullUrl;
}
public static string GetSignature(WebMethod method, string url, out string timestamp, out string nonce)
{
OAuthBase oAuth = new OAuthBase();
nonce = oAuth.GenerateNonce();
timestamp = oAuth.GenerateTimeStamp();
string nurl, nrp;
Uri uri = new Uri(url);
string sig = oAuth.GenerateSignature(
uri,
YOURCONSUMERKEY,
YOURCONSUMER_SECRET,
AuthToken,
AuthTokenSecret,
method.ToString(),
timestamp,
nonce,
OAuthBase.SignatureTypes.PLAINTEXT, out nurl, out nrp);
return System.Web.HttpUtility.UrlEncode(sig);
}
private static HttpWebRequest CreateWebRequest(string fullUrl, WebMethod method, string nonce, string timeStamp, string sig)
{
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(fullUrl);
request.Method = method.ToString();
request.Proxy = Yammer.Session.WebProxy;
string authHeader = CreateAuthHeader(method, nonce, timeStamp, sig);
request.ContentType = "application/x-www-form-urlencoded";
request.Headers.Add("Authorization", authHeader);
return request;
}
private static string CreateAuthHeader(WebMethod method, string nonce, string timeStamp, string sig)
{
var sb = new StringBuilder();
sb.Append("OAuth ");
if (method == WebMethod.POST)
sb.Append("realm=\"" + "\",");
else
sb.Append("realm=\"\",");
string authHeader = "oauth_consumer_key=\"" + YOURCONSUMERKEY + "\"," +
"oauth_token=\"" + YOURAUTHTOKEN + "\"," +
"oauth_nonce=\"" + nonce + "\"," +
"oauth_timestamp=\"" + timeStamp + "\"," +
"oauth_signature_method=\"" + "HMAC-SHA1" + "\"," +
"oauth_version=\"" + "1.0" + "\"," +
"oauth_signature=\"" + sig + "\"";
sb.Append(authHeader);
return sb.ToString();
}

Use Request and Response variables in the static web method

Here is my code,
[WebMethod]
public static bool FirstAccess()
{
string app_id = "139295982898884";
string app_secret = "b5d2a88b56898610d54da2af498e3220";
//string post_login_url = "http://dev.fitbook.com.asp1-23.ord1-1.websitetestlink.com/v4/FitbookContest.aspx";
string post_login_url = "http://localhost:4327/FitbookContest.aspx";
string scope = "publish_stream,manage_pages";
string code = HttpContext.Current.Request["code"] ?? "";
try
{
if (code == "")
{
string dialog_url = "http://www.facebook.com/dialog/oauth?" + "client_id=" + app_id + "&redirect_uri=" + HttpContext.Current.Server.UrlEncode(post_login_url) + "&scope=publish_stream";
// HttpContext.Current.Response.Write(dialog_url);
//HttpContext.Current.Response.Redirect(dialog_url, true);
return false;
}
else
{
Dictionary<string, string> tokens = new Dictionary<string, string>();
string url = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&scope={2}&code={3}&client_secret={4}", app_id, HttpContext.Current.Request.Url.AbsoluteUri, scope, HttpContext.Current.Request["code"].ToString(), app_secret);
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(response.GetResponseStream());
string vals = reader.ReadToEnd();
foreach (string token in vals.Split('&'))
{
//meh.aspx?token1=steve&token2=jake&...
tokens.Add(token.Substring(0, token.IndexOf("=")), token.Substring(token.IndexOf("=") + 1, token.Length - token.IndexOf("=") - 1));
}
}
access_token = tokens["access_token"];
TestFB.GetProfilePic(code);
return true;
}
}
catch (Exception ex)
{
return false;
}
}
Here the lines like
HttpContext.Current.Request["code"] ?? "";
and
HttpContext.Current.Response.Redirect(dialog_url, true);
are not working. So is there any alternative solution for it? Is there any way to use it?

Have you tried this,
string dialog_url = "~http://www.facebook.com/dialog/oauth?" + "client_id=" + app_id + "&redirect_uri=" + HttpContext.Current.Server.UrlEncode(post_login_url) + "&scope=publish_stream";
and, redirect as false indicate Whether execution of current page should terminate
HttpContext.Current.Response.Redirect(dialog_url,false);
Simply try this:
string code = HttpContext.Current.Request["code"];
if (code==null)
{
// code
}
and I think the problem is in the line. You didn't specify accesstoken
string url = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&scope={2}&code={3}&client_secret={4}", app_id, HttpContext.Current.Request.Url.AbsoluteUri, scope, HttpContext.Current.Request["code"].ToString(), app_secret);