How do I post to an application's wall using Fb C# Sdk? - facebook

Question

I've been trying to post something to my application's timeline/feed/wall on Fb, for the better part of the day but I keep failing. This is getting frustrating.
What I'm doing is : I'm having a simple console C# app, that is trying to post something on the application's wall (a basic hello world!, for instance).
This snippet shows how I'm retrieving an access token :
private string _AccessToken;
public string AccessToken
{
get
{
if (string.IsNullOrEmpty(_AccessToken))
{
//_AccessToken = string.Format("{0}|{1}", Credentials.AppId, Credentials.AppSecret);
Logger.Debug("Attempting to retrieve the access token...");
dynamic result = ExecuteGet("oauth/access_token", new
{
client_id = Credentials.AppId, // my app id
client_secret = Credentials.AppSecret, // my app secret
grant_type = "client_credentials",
scope = "manage_pages,publish_actions,publish_stream"
}, false);
_AccessToken = result.access_token;
}
Logger.Debug("Operation succeeded, access token is : {0}", _AccessToken);
return _AccessToken;
}
}
private object ExecuteGet(string path, object parameters)
{
return ExecuteGet(path, parameters, true);
}
private object ExecuteGet(string path, object parameters, bool useAccessToken)
{
try
{
Logger.Debug("Executing GET : {0}", path);
var client = useAccessToken ? new FacebookClient(AccessToken) : new FacebookClient();
return client.Get(path, parameters);
}
catch (FacebookApiException ex)
{
Logger.Error("GET Operation failed : {0}", ex.Message);
throw;
}
}
And this is how I'm trying to actually post something :
public void PostToApplicationWall(string message)
{
string path = string.Format("/{0}/feed", Credentials.AppId);
IDictionary<string, object> parameters = new Dictionary<string, object>()
{
{ "description", "[DESCRIPTION] Facebook description..." },
{ "link", "http://tinyurl.org" },
{ "name", "[NAME] Facebook name..." },
{ "caption", "[CAPTION] Facebook caption..." },
{ "message", message }
};
dynamic result = ExecutePost(path, parameters);
}
private object ExecutePost(string path, object parameters)
{
try
{
Logger.Debug("Executing POST : {0}", path);
var client = new FacebookClient(AccessToken);
return client.Post(path, parameters);
}
catch (FacebookApiException ex)
{
Logger.Error("POST Operation failed : {0}", ex.Message);
throw;
}
}
Please note that ExecutePost() uses the AccessToken property, I've pasted in the beginning.
The message that I'm getting is : (OAuthException - #210) (#210) Subject must be a page
Please help, I have no idea what am I doing wrong.

Answer 1

Maciek, if you really just want to post to your own page, writing a standalone app may not be the easiest way to do this. Have you tried PowerShell and http://facebookpsmodule.codeplex.com? This module will take care of the permissioning for you, and let you do this operation with a simple script.

Answer 2

App profile pages are discontinued since Feburary 1st 2012. You have to create an app page. Read here.
Now, when you have an app page, you change your code like this:
string path = string.Format("/{0}/feed", Credentials.PageId);
OR
string path = string.Format("/{0}/feed", Credentials.PageUsername);
[EDIT]
For posting to a page, you need the page access token instead of app access token. Read here on how to get a page access token.