// global variable
const string ConsumerKey = "consumerkey";
const string ConsumerSecret = "consumersecret";
RequestToken requestToken;
AccessToken accessToken;

private void GetRequestTokenButton_Click(object sender, RoutedEventArgs e)
{
    var authorizer = new OAuthAuthorizer(ConsumerKey, ConsumerSecret);
    authorizer.GetRequestToken("http://twitter.com/oauth/request_token")
        .Select(res => res.Token)
        .ObserveOnDispatcher()
        .Subscribe(token =>
        {
            requestToken = token;
            var url = authorizer.BuildAuthorizeUrl("http://twitter.com/oauth/authorize", token);
            webBrowser1.Navigate(new Uri(url)); // navigate browser
        });
}    

private void GetAccessTokenButton_Click(object sender, RoutedEventArgs e)
{
    var pincode = PinCodeTextBox.Text; // userinput

    var authorizer = new OAuthAuthorizer(ConsumerKey, ConsumerSecret);
    authorizer.GetAccessToken("http://twitter.com/oauth/access_token", requestToken, pincode)
        .ObserveOnDispatcher()
        .Subscribe(res =>
        {
            // response has Token and extra data(twitter is user_id and screen_name)
            UserIdTextBlock.Text = res.ExtraData["user_id"].First();
            ScreenNameTextBlock.Text = res.ExtraData["screen_name"].First();
            accessToken = res.Token; // AccessToken
        });
}

// set url and parameters.
// parameter can use Collection Initializer
private void GetTimeLineButton_Click(object sender, RoutedEventArgs e)
{
    var client = new OAuthClient(ConsumerKey, ConsumerSecret, accessToken)
    {
        Url = "http://api.twitter.com/1/statuses/home_timeline.xml",
        Parameters = { { "count", 20 }, { "page", 1 } }
    };
    client.GetResponseText() // OAuthClient have three methods, GetResponse/GetResponseText/GetResponseLines
        .Select(s => XElement.Parse(s))
        .SelectMany(x => x.Descendants("status"))
        .Select(x => new
        {
            Text = x.Element("text").Value,
            Name = x.Element("user").Element("screen_name").Value
        })
        .ObserveOnDispatcher()
        .Subscribe(
            a => TimeLineViewListBox.Items.Add(a.Name + ":" + a.Text),
            ex => MessageBox.Show(ex.ToString())); // easy error handling
}

// if post then set MethodType = MethodType.Post
private void PostButton_Click(object sender, RoutedEventArgs e)
{
    var postText = PostTextBox.Text; // user input
    
    var client = new OAuthClient(ConsumerKey, ConsumerSecret, accessToken)
    {
        MethodType = MethodType.Post,
        Url = "http://api.twitter.com/1/statuses/update.xml",
        Parameters = { { "status", postText } }
    };
    client.GetResponseText() // post and GetResponse
        .Select(s => XElement.Parse(s))
        .ObserveOnDispatcher()
        .Subscribe(x => MessageBox.Show("Post Success:" + x.Element("text").Value));
}

IDisposable streamingHandle = Disposable.Empty;

private void StreamingStartButton_Click(object sender, RoutedEventArgs e)
{
    var client = new OAuthClient(ConsumerKey, ConsumerSecret, accessToken)
    {
         Url = "https://userstream.twitter.com/2/user.json"
    };
    streamingHandle = client.GetResponseLines()
        .Where(s => !string.IsNullOrWhiteSpace(s)) // filter invalid data
        .Select(s => DynamicJson.Parse(s))
        .Where(d => d.text()) // has text is "status"
        .ObserveOnDispatcher()
        .Subscribe(
            d => StreamingViewListBox.Items.Add(d.user.screen_name + ":" + d.text));
}

// call Dispose is stop streaming
private void StreamingStopButton_Click(object sender, RoutedEventArgs e)
{
    streamingHandle.Dispose();
}

// CameraCaptureTask's Completed Event
void camera_Completed(object sender, PhotoResult e)
{
    if (e.TaskResult == TaskResult.OK)
    {
        // photo picture(Stream) to byte array
        var stream = e.ChosenPhoto;
        var buffer = new byte[stream.Length];
        stream.Read(buffer, 0, buffer.Length);

        // set key, sercret, token
        new TwitpicClient(ConsumerKey, ConsumerSecret, accessToken)
            .UploadPicture(e.OriginalFileName, "from WP7!", buffer)
            .ObserveOnDispatcher()
            .Catch((WebException ex) =>
            {
                MessageBox.Show(new StreamReader(ex.Response.GetResponseStream()).ReadToEnd());
                return Observable.Empty<string>();
            })
            .Subscribe(s => MessageBox.Show(s), ex => MessageBox.Show(ex.ToString()));
    }
}