/// <summary>
/// See <see cref="IAuthContext.GetLoginUrl(Uri, LoginParams)"/>.
/// </summary>
/// <param name="nextUrl" />
/// <param name="params" />
/// <returns />
///<exception cref="ArgumentNullException"><paramref name="nextUrl"/> is null.</exception>
public string GetLoginUrl(Uri nextUrl, LoginParams @params)
{
if (nextUrl == null)
throw FacebookApi.Nre("nextUrl");
var p = new Dictionary<string, string>();
if (!String.IsNullOrEmpty(@params.CancelUrl))
p.Add("cancel_url", @params.CancelUrl);
if (!String.IsNullOrEmpty(@params.ReqPerms))
p.Add("req_perms", @params.ReqPerms);
if (@params.Display != LoginDialogDisplay.NotSet)
p.Add("display", @params.Display.ToString().ToLowerInvariant());
return GetLoginUrl(nextUrl, p);
}
