testCoreTweet2

MainWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="testCoreTweet2.MainWindow"
        Title="MainWindow" Width="525" SizeToContent="Height" d:DesignHeight="345">
    <StackPanel>
        <StackPanel Orientation="Horizontal">
            <Label Content="Account:"/>
            <Label x:Name="screennameLabel" Content="unregister" />
            <Button x:Name="registButton" Content="regist"  Width="75" Click="registButton_Click"/>
        </StackPanel>
        <TextBox x:Name="viewTextBox" Text="TextBox" Height="225" VerticalScrollBarVisibility="Auto" HorizontalScrollBarVisibility="Auto" />
        <Button x:Name="getTl" Content="getTl" Click="getTl_Click"/>
    </StackPanel>
</Window>

MainWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using CoreTweet;

namespace testCoreTweet2
{
    /// <summary>
    /// MainWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class MainWindow : Window
    {
        internal Tokens tokens;

        public MainWindow()
        {
            InitializeComponent();

            // トークン組立
            if (!string.IsNullOrEmpty(Properties.Settings.Default.AccessToken)
                && !string.IsNullOrEmpty(Properties.Settings.Default.AccessTokenSecret))
            {
                tokens = Tokens.Create(
                    Properties.Settings.Default.ApiKey
                    , Properties.Settings.Default.ApiSecret
                    , Properties.Settings.Default.AccessToken
                    , Properties.Settings.Default.AccessTokenSecret);
                updatescreennameLabel();

                /*
                 * http://01647.hateblo.jp/entry/2014/10/12/132505
                 * CoreTweet.Tokens.Account.VerifyCredentials()とTwitter OAuth2それぞれの調査記録 2014-10-12
                 * 
                 * 動的にScreenNameを得る場合のテストコード
                 */
                // トークン有効性確認
                //try
                //{
                //    var userResponse = tokens.Account.VerifyCredentials();
                //    updatescreennameLabel(userResponse.ScreenName);
                //    Properties.Settings.Default.ScreenName = userResponse.ScreenName;
                //    Properties.Settings.Default.Save();
                //}
                //catch (Exception ex)
                //{
                //    // MessageBox.Show(ex.Message);
                //    tokens = null;
                //}
            }
        }

        /// <summary>
        /// スクリーンネーム表示を更新する
        /// </summary>
        /// <param name="screenName">Twitter Screen Name</param>
        /// パラメータ省略時は設定ファイルを読み出す
        internal void updatescreennameLabel(string screenName = null)
        {
            string _screenName;
            if (string.IsNullOrEmpty(screenName))
            {
                _screenName = Properties.Settings.Default.ScreenName;
                // 未認証時
                if (string.IsNullOrEmpty(_screenName))
                {
                    screennameLabel.Content = "unregister";
                    return;
                }
            }
            else
            {
                _screenName = screenName;
            }
            // http://msdn.microsoft.com/ja-jp/library/system.windows.controls.label(v=vs.110).aspx
            // WPF Labelにおける文字 _ の仕様について対策する
            screennameLabel.Content = _screenName.Replace("_", "__");
        }

        // Twitter アカウント認証
        private void registButton_Click(object sender, RoutedEventArgs e)
        {
            var dialog = new RegistAccountWindow();
            dialog.Owner = this;
            // http://msdn.microsoft.com/ja-jp/library/system.windows.window.showdialog(v=vs.110).aspx
            dialog.ShowDialog();
        }

        private void getTl_Click(object sender, RoutedEventArgs e)
        {
            if (tokens != null)
            {
                viewTextBox.Clear();
                try
                {
                    foreach (var status in tokens.Statuses.HomeTimeline())
                    {
                        // http://qiita.com/lambdalice/items/55b1a3d8403ecc603b47#2-4 例1: REST API 
                        // {ユーザー名}: {投稿内容}{改行}
                        viewTextBox.AppendText(string.Format("{0}: {1}{2}"
                            , status.User.ScreenName
                            , status.Text
                            , Environment.NewLine));
                    }
                }
                catch (Exception ex)
                {
                    viewTextBox.AppendText(ex.Message);
                }
            }
        }

    }
}

RegistAccountWindow.xaml

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008" xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" mc:Ignorable="d" x:Class="testCoreTweet2.RegistAccountWindow"
        Title="Get PIN" Width="550" d:DesignHeight="229" SizeToContent="Height" ContentRendered="Window_ContentRendered">
    <StackPanel>
        <Label Content="Access here:" />
        <TextBox x:Name="pinURITextBox" HorizontalScrollBarVisibility="Auto" IsReadOnly="True" Text="processing..."/>
        <Label Content="PIN:"/>
        <TextBox x:Name="pinTextBox" />
        <Button x:Name="okButton" Content="OK" IsDefault="True" Click="okButton_Click"/>
        <Button x:Name="cancelButton" Content="Cancel" IsCancel="True" Click="cancelButton_Click"/>

    </StackPanel>
</Window>

RegistAccountWindow.xaml.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Shapes;
using CoreTweet;

namespace testCoreTweet2
{
    /// <summary>
    /// RegistAccountWindow.xaml の相互作用ロジック
    /// </summary>
    public partial class RegistAccountWindow : Window
    {
        OAuth.OAuthSession session;

        public RegistAccountWindow()
        {
            InitializeComponent();
        }

        private void Window_ContentRendered(object sender, EventArgs e)
        {
            // http://msdn.microsoft.com/ja-jp/library/system.windows.window.contentrendered(v=vs.110).aspx
            initAuthrize();
        }

        // OAuthセッションを作る
        private void initAuthrize()
        {
            try
            {
                session = OAuth.Authorize(Properties.Settings.Default.ApiKey, Properties.Settings.Default.ApiSecret);
                pinURITextBox.Text = session.AuthorizeUri.ToString();
                pinTextBox.Clear();
                // System.Diagnostics.Process.Start(session.AuthorizeUri.ToString());
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                Close();
            }
        }

        private void cancelButton_Click(object sender, RoutedEventArgs e)
        {
            this.Close();
        }

        private void okButton_Click(object sender, RoutedEventArgs e)
        {
            // http://msdn.microsoft.com/ja-jp/library/system.text.regularexpressions.regex.aspx
            // http://msdn.microsoft.com/ja-jp/library/az24scfc.aspx 正規表現言語 - クイック リファレンス
            // PINに数字以外を含む場合，認証に移行しない
            if (string.IsNullOrEmpty(pinTextBox.Text)
                || System.Text.RegularExpressions.Regex.IsMatch(pinTextBox.Text, @"\D"))
            {
                MessageBox.Show("Type numeric characters");
                pinTextBox.Clear();
                return;
            }

            try
            {
                // PIN認証
                MainWindow owner = (MainWindow)this.Owner;
                owner.tokens = session.GetTokens(pinTextBox.Text);
                // トークン保存
                Properties.Settings.Default.AccessToken = owner.tokens.AccessToken;
                Properties.Settings.Default.AccessTokenSecret = owner.tokens.AccessTokenSecret;
                Properties.Settings.Default.ScreenName = owner.tokens.ScreenName;
                Properties.Settings.Default.Save();
                // 表示調整
                owner.updatescreennameLabel(owner.tokens.ScreenName);

                MessageBox.Show("verified: " + owner.tokens.ScreenName);
                Close();
            }
            catch (Exception ex)
            {
                // やり直し
                MessageBox.Show(ex.Message);
                initAuthrize();
            }

        }

    }
}

http://01647.hateblo.jp/entry/2014/10/15/112245
C# WPF初心者のCoreTweet入門4 別ソリューションを作成し，入門1-3のまとめとWPFの勉強 2014-10-15
https://gist.github.com/ustreamer-01647/e01f0e0e1bc710d27f95/2182f1b8d07a8e93e985ee991ffc565c0254c171