how to authorize a user on behalf of facebook app using facebook csharp sdk
Getting error while authorising an user ....enter image description here
this is my code .
public partial class facebook : System.Web.UI.Page { protected void Page_Load(object sender, EventArgs e) { if (Request["code"] != null && Page.IsPostBack) { checkauthorization(); } }
protected void btnpost_Click(object sender, EventArgs e)
{
checkauthorization();
}
public void checkauthorization()
{
string app_id = "appid";
string app_secret = "app secret";
string scope = "publish_stream,manage_pages";
if (Request["code"] == null)
{
Response.Redirect(string.Format("http://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("http://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 = 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"];
var client = new FacebookClient(access_token);
client.Post("/me/feed/", new { message = txtmsg.Text.Trim() });
}
}
}
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