check if the specified access token has enough permission

FacebookPemissions.cs

/// <returns>returns null is doesn't have enough permission</returns>
public string[] HasPermissions(string accessToken, string[] permissions)
{
    try
    {
        var fb = new FacebookClient(accessToken);
        var remoteResult = ((IDictionary<string, object>)fb.Get("me/permissions"));
        if (remoteResult != null && remoteResult.ContainsKey("data"))
        {
            var data = remoteResult["data"] as IList<object>;

            if (data != null && data.Count > 0)
            {
                var permData = data[0] as IDictionary<string, object>;
                return permData == null
                            ? new string[0]
                            : (permData.Where(perm => perm.Value.ToString() == "1").Select(perm => perm.Key)).ToArray();
            }
        }
    }
    catch (FacebookOAuthException)
    {
        return null;
    }

    return null;
}