Facebook c# sdk Invalid access token signature on FacebookClient
I have a problem about Facebook c# sdk.
When i try to connect with accesstoken it s giving a error message: (OAuthException) Invalid access token signature
My url is:
https://www.facebook.com/dialog/oauth?client_id=" + _appid + "&redirect_uri=http://localhost:51656/Register.aspx?scope=email,publish_stream,offline_access,create_event,user_about_me,user_activities,user_birthday,user_education_history,user_events,user_groups,user_interests,user_likes,user_location,user_notes,user_religion_politics,user_relationship_details,user_photos,user_status
My Code is:
string _code ="";
string _appid = "184604574912126";
string _accesstoken;
protected void Page_Load(object sender, EventArgs e)
{
if (Request.QueryString["code"] != null)
{
_code = Request.QueryString["code"].ToString();
}
if (_code != "")
{
_accesstoken = _appid + "|" + _code;
vFB = new FacebookClient(_accesstoken);
}
try
{
JsonObject vmyobject = (JsonObject)vFB.Get("/me");
this line giving exaption.
}
What am i missing?
您获取访问令牌的方式不正确，请参阅此代码
string AP_ID = System.Configuration.ConfigurationManager.AppSettings["FacebookAppID"];
string client_secret = System.Configuration.ConfigurationManager.AppSettings["FacebookAppSecret"];
string mywebsite = System.Configuration.ConfigurationManager.AppSettings["FacebookAppSecret"];
string oathPage = System.Configuration.ConfigurationManager.AppSettings["PostAuthorizeRedirectURL"];
string redirect_uri = mywebsite + oathPage;
string code = Page.Request.QueryString["code"];
string link = string.Format("https://graph.facebook.com/oauth/access_token?client_id={0}&code={1}&client_secret={2}&redirect_uri={3}", AP_ID, code, client_secret, redirect_uri);
WebClient webq = new WebClient();
string access_token = webq.DownloadString(link);
int pos2 = access_token.IndexOf("&expires");
if (pos2!=-1)
access_token = access_token.Substring(13, pos2 - 13);
else access_token = access_token.Substring(13, access_token.Length-13);
使用此方法从代码获取有效的access_token ：
public string GetAccessTokenFromCode(string AppID, string AppSecret, string RedirectURL, string Code)
{
WebClient wc = new WebClient();
string u2 = "https://graph.facebook.com/oauth/access_token?client_id=" + AppID + "&redirect_uri=" + RedirectURL + "&client_secret=" + AppSecret + "&code=" + Code + "&state=anytexthere";
string access = wc.DownloadString(u2);
access = access.Substring(access.IndexOf("access_token") + 13);
if (access.Contains("&"))
{
string accesstoken = access.Substring(0, access.IndexOf("&"));
return accesstoken;
}
return access;
}
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