Develop Reference

Get User Access Token of Facebook in C# console application

I want to create a C# console application to create a post on my FaceBook account wall.
I tried to search how to get this but all i get is information about get access_token in web application where we can add redirect URL : http://localhost.
I am using below code to get an access_token in Console application.
But i get output from this below code is :
{
"access_token": "*****|*************",
"token_type": "bearer"
}
Which App_ID|App_Secret..where user Access_token should be of very big length.
Is this possible to post on facebook account wall using console application??
private const string FacebookApiId = "************";
private const string FacebookApiSecret = "**************************";
private const string AuthenticationUrlFormat =
"https://graph.facebook.com/oauth/access_token?client_id={0}&client_secret={1}&grant_type=client_credentials&scope=manage_pages,offline_access,publish_stream";
static void Main(string[] args)
{
string accessToken = GetAccessToken(FacebookApiId, FacebookApiSecret);
PostMessage(accessToken, "My message");
}
static string GetAccessToken(string apiId, string apiSecret)
{
string accessToken = string.Empty;
string url = string.Format(AuthenticationUrlFormat, apiId, apiSecret, "manage_pages,offline_access,publish_stream");
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
String responseString = reader.ReadToEnd();
NameValueCollection query = HttpUtility.ParseQueryString(responseString);
accessToken = query["access_token"];
}
if (accessToken.Trim().Length == 0)
throw new Exception("There is no Access Token");
return accessToken;
}

Send post to Facebook page

I have a c# asp.net web application.
I am using the facebook login through their javascript sdk and it does the login.
Now I have a Simple WYSIWYG Editor in which whatever is added should be posted on the facebook page of that logged in user.
Following is the code:
string FacebookApiId = "952214336368241";
string FacebookApiSecret = "fb2213d66523c8cb0bc99306f46ee457";
string accessToken = GetAccessToken(FacebookApiId, FacebookApiSecret);
PostMessage(accessToken, "My message");
private string GetAccessToken(string apiId, string apiSecret)
{
string AuthenticationUrlFormat = "https://graph.facebook.com/oauth/access_token?client_id={0}&client_secret={1}&grant_type=client_credentials&scope=manage_pages,offline_access,publish_stream";
string accessToken = string.Empty;
string url = string.Format(AuthenticationUrlFormat, apiId, apiSecret);
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();
using (Stream responseStream = response.GetResponseStream())
{
StreamReader reader = new StreamReader(responseStream, Encoding.UTF8);
String responseString = reader.ReadToEnd(); // this gives me {"access_token":"952214336368241|McqSGYIMU1eYBZ1zGydWj9hu6Bt","token_type":"bearer"}
NameValueCollection query = HttpUtility.ParseQueryString(responseString);
accessToken = query["access_token"]; // This line throws error
}
//if (accessToken.Trim().Length == 0)
//throw new Exception("There is no Access Token");
return "952214336368241|McqSGYIMU1eYBZ1zGydWj9hu6B"; // hard-coded to get it working;
}
private void PostMessage(string accessToken, string v)
{
try
{
FacebookClient facebookClient = new FacebookClient(accessToken);
dynamic messagePost = new ExpandoObject();
messagePost.access_token = accessToken;
messagePost.message = v;
var result = facebookClient.Post("/[user id]/feed", messagePost);
}
catch (FacebookOAuthException ex)
{
//handle something
}
catch (Exception ex)
{
//handle something else
}
}
This throws error:
{"(OAuthException - #803) (#803) Some of the aliases you requested do not exist: [user id]"}
I even wrote my facebook emailid instead of [user id] but it still does not work and gives me error:
Message: "(OAuthException - #2500) An active access token must be used to query information about the current user."
Can anyone please advise how can I remove this error.

The code is VERY old, offline_access and publish_stream do not exist anymore since many years.
You have to use a Page Token with the publish_pages permission in order to post to your Page with the API.
You can use "me/feed" or "page-id/feed", but not an Email.
Information about Tokens and how to generate them:
https://developers.facebook.com/docs/facebook-login/access-tokens/
https://www.devils-heaven.com/facebook-access-tokens/
Try stuff in the API Explorer before programming: https://developers.facebook.com/tools/explorer/

Fetch Facebook user profile details with profile picture and Logout properties using Facebook C# SDK

i want to fetch user details with profile picture using Facebook c# SDK.I have done some coding and able to login using Facebook in my app.I am explaining my code below.
immediateHelp.aspx.cs:
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
if (Request.Params["code"] != null)
{
//Facebook.FacebookAPI api = new Facebook.FacebookAPI();
FacebookClient client = new Facebook.FacebookClient(GetAccessToken());
object me = client.Get("/me");
lblTextImage.ImageUrl="need picture here" ;
lblTextEmail.Text="need email here";
// JSONObject meFriends = client.Get("/me/friends");
}
}
}
private string GetAccessToken()
{
if (HttpRuntime.Cache["access_token"] == null)
{
Dictionary<string, string> args = GetOauthTokens(Request.Params["code"]);
HttpRuntime.Cache.Insert("access_token", args["access_token"], null, DateTime.Now.AddMinutes(Convert.ToDouble(args["expires"])), TimeSpan.Zero);
}
return HttpRuntime.Cache["access_token"].ToString();
}
private Dictionary<string, string> GetOauthTokens(string code)
{
Dictionary<string, string> tokens = new Dictionary<string, string>();
string clientId = "*************";
string redirectUrl = "http://localhost:3440/immediateHelp.aspx";
string clientSecret = "************************";
string scope = "user_photos,email";
string url = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&redirect_uri={1}&client_secret={2}&code={3}&scope={4}",
clientId, redirectUrl, clientSecret, code, scope);
HttpWebRequest request = WebRequest.Create(url) as HttpWebRequest;
using (HttpWebResponse response = request.GetResponse() as HttpWebResponse)
{
StreamReader reader = new StreamReader(response.GetResponseStream());
string retVal = reader.ReadToEnd();
foreach (string token in retVal.Split('&'))
{
tokens.Add(token.Substring(0, token.IndexOf("=")),
token.Substring(token.IndexOf("=") + 1, token.Length - token.IndexOf("=") - 1));
}
}
return tokens;
}
I need to attach image in image field and email in text Box after login.I need also logout properties with destroy session using Facebook c# SDK.Please help me to resolve this.

The following code will help you get email and profile picture. The code client.Get("/me?fields=picture")) return picture in format of Json so that we need to extract the url as the code show :
FacebookClient client = new FacebookClient(access_token);
dynamic myInfo = fb.Get("/me?fields=email");
var picture = (((JsonObject)(JsonObject)client.Get("/me?fields=picture"))["picture"]);
var url = (string)(((JsonObject)(((JsonObject)picture)["data"]))["url"]);
lblTextImage.ImageUrl=url;
lblTextEmail.Text=myInfo.email;
Hop this work for you.

C# facebook SDK dont work

I have a website write (.net 4) and i am tring to create some facebook login.
After i download Facebook sdk for c#, i am tring to get user info using the access token.
It seems to me that i am doing something wrong, all the examples i examined, were little bit diffrent from mine. instead of getting me paramethers by :
me["id"] // mine
me.id // examples
when i try to get values like the examples i got errors.
also i am having problem with get the email address of user, already add email to scope:
This method responsible for get the access token:
public string GetAccessToken()
{
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}",
strAppId, Request.Url.AbsoluteUri, strScope, Request["code"].ToString(), strAppSecret);
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('&'))
{
tokens.Add(token.Substring(0, token.IndexOf("=")),
token.Substring(token.IndexOf("=") + 1, token.Length - token.IndexOf("=") - 1));
}
}
string access_token = tokens["access_token"];
return access_token;
}
This method responsible for get user information:
public string GetUserInfo(string strToken)
{
var client = new FacebookClient(strToken);
dynamic me = client.Get("me");
User user = new User();
try
{
string user_id = me["id"];
string user_first_name = me["first_name"];
string user_last_name = me["last_name"];
string user_name = me["username"];
string user_location = me["location"]["name"];
string user_city = me["hometown"]["name"];
//user_mail = me.email; }
catch(Exception ex)
{
}
return string.Empty;
}
when try to run on me.email or me["email"] i get this error:
'me.email' threw an exception of type 'Microsoft.CSharp.RuntimeBinder.RuntimeBinderException' dynamic {Microsoft.CSharp.RuntimeBinder.RuntimeBinderException}

I suggest you to use Microsoft.AspNet.Mvc.Facebook. It's easy to use and has all these properties already done.
http://www.asp.net/mvc/tutorials/mvc-4/aspnet-mvc-facebook-birthday-app

Facebook - posting with facebook dialog

I manage get access token from FB.
I can post on wall. But I need to display popup window (dialog?) to allow user add comment and see what he posting (sharing).
Im confused with Open graph which I believe I use and graph API. Is the same thing?
Bellow is my code:
private string CheckAuthorization()
{
string app_id = "xxxxxxxxxxxxxxxx";
string app_secret = "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx";
string scope = "publish_stream,email,user_location,user_birthday";
if (Request["code"] == null)
{
Response.Redirect(string.Format("https://graph.facebook.com/oauth/authorize?client_id={0}&redirect_uri={1}&scope={2}",
app_id, Request.Url.AbsoluteUri, scope));
}
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, Request.Url.AbsoluteUri, scope, Request["code"].ToString(), app_secret);
HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
HttpWebResponse response = (HttpWebResponse)request.GetResponse();
StreamReader reader = new StreamReader(response.GetResponseStream());
string vals = reader.ReadToEnd();
foreach (string token in vals.Split('&'))
{
tokens.Add(token.Substring(0, token.IndexOf("=")),
token.Substring(token.IndexOf("=") + 1, token.Length - token.IndexOf("=") - 1));
}
return tokens["access_token"];
}
}
Above code working fine Im getting access token (login popup when Im not logged and popup with information about what info will be shared).
Then I post on FB wall:
var client = new FacebookClient(access_token);
client.Post("/me/feed", new { message = "some text to post" });
My question is how to get popup window before post with description what Im posting and option to add user own comment.