Facebook API to get access token

I have a requirement where I want to use Facebookaccess token using only APIs.
I have seen methods which works using web requests and responses to get the Facebook API and they also use redirect URIs.

But I cant really use redirect URI since I want to use it in a azure worker role.

Something like:

facebook a=new facebook();
a.appid="";

This is just a visualization but any help would be great.

EDIT:

Below answer helps. and if i use following uri in browser https://graph.facebook.com/oauth/access_token?client_id=app_Id&client_secret=secret_key&grant_type=client_credentials

it shows access_token=### but if use following code to do the same in .net string url = "https://graph.facebook.com/oauth/access_token?client_id=app_id &client_secret=secretKey &grant_type=client_credentials";

string token;
WebRequest request = WebRequest.Create(url);
WebResponse response = request.GetResponse();

it throws unauthorized

---

If the C# API doesn't provide method for it, you can do it yourself. The access token is the content of following url. You just have to make https request.

https://graph.facebook.com/oauth/access_token?client_id=<APP_ID>&client_secret=<APP_SECRET>&grant_type=client_credentials

OK, so here is working PHP code:

function getAccessToken(){
    $token_url = 'https://graph.facebook.com/oauth/access_token?client_id='.APP_ID.'&client_secret='.APP_SECRET.'&grant_type=client_credentials';
    return makeRequest($token_url);
}

function makeRequest( $url, $timeout = 5 ) {
    $ch = curl_init();
    curl_setopt( $ch, CURLOPT_USERAGENT, "PHP_APP" );
    curl_setopt( $ch, CURLOPT_URL, $url );
    curl_setopt( $ch, CURLOPT_ENCODING, "" );
    curl_setopt( $ch, CURLOPT_RETURNTRANSFER, true );
    curl_setopt( $ch, CURLOPT_AUTOREFERER, true );
    curl_setopt( $ch, CURLOPT_SSL_VERIFYPEER, false );    # required for https urls
    curl_setopt( $ch, CURLOPT_CONNECTTIMEOUT, $timeout );
    curl_setopt( $ch, CURLOPT_TIMEOUT, $timeout );
    curl_setopt( $ch, CURLOPT_MAXREDIRS, 10 );
    $content = curl_exec( $ch );
    $response = curl_getinfo( $ch );
    curl_close ( $ch );

    if($response['http_code'] == 200) return $content;
    return FALSE;
}

链接地址: http://www.djcxy.com/p/61604.html

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