How to do a post in facebook on my page fan wall with c# and asp.net

asp.net, c#, facebook, facebook-graph-api

Solution

I hope this post will be helpfull for lots of people, i try to be simple and clear :

1-Create your facebook developper account, and to test your code in your computern (`localhost`), set your localhost adress in the field "website authentication with facebook authentication". For me it will be `http://localhost:2551/Default.aspx` for example because i test in the Defaut.aspx of my wweb application. You 'll change this adress when you'll deploy on your website (for me i ll change with http://www.mywebsiteurl.com/Default.aspx just before deploy the code on my website).

2- With your facebook user account, create your fan page.

3-When you created your fan page , go to your fan page see the URL to obtain your PAGE_ID For example mine is http://www.facebook.com/pages/toto/446533181408238?ref=ts&fref=ts so my PAGE_ID is 446533181408238

3- It's almost finished, just a little explanation : because i created the fan page , i m administrator of the fan page and i must ask the authoraization to facebook to post since my developper account so i must get the autorisation for 2 actions : publish_stream and manage_pages.

Let's go for coding :

  private void Do()
        {
            string app_id = "157873644371675";
            string app_secret = "c27a10c347af4280720fa3d76c9ae08c";
            string scope = "publish_stream,manage_pages";

            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 = System.Net.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));
                    }
                }

                string access_token = tokens["access_token"];

                var client = new FacebookClient(access_token);

                dynamic parameters = new ExpandoObject();
                parameters.message = "Check out this funny article";
                parameters.link = "http://www.natiska.com/article.html";
                parameters.picture = "http://www.natiska.com/dav.png";
                parameters.name = "Article Title";
                parameters.caption = "Caption for the link";

                //446533181408238 is my fan page
                client.Post("/446533181408238/feed", parameters);

            }
              }

Problem

Original source

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