linqToTwitter example

How to do a quick test of linqToTwitter with VS 2012 .net 45 and forms.

Login with you test account on dev.twitter

Under tools/Manager

This will create the two keys that link your app on twitter to your test application.

Now lets get started

In Visual Studio (2012+), create a new windows form application.

Open the NuGet Package Manager under tools, start the console

Enter install-package linqToTwitter

https://linqtotwitter.codeplex.com/SourceControl/changeset/view/8c63d7991761#BuildScripts/ReadMe.txt

Confirm you projects package.config is up to date with:

https://linqtotwitter.codeplex.com/SourceControl/changeset/view/8c63d7991761#New/Demos/Linq2TwitterDemos_Console/packages.config

You need two more references

System.Configuration 

Microsoft.VisualBasic

Follow the code below:

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
using System.Windows.Forms;
using System.Diagnostics;
//add references
using System.Configuration;
//this is for the messagebox in vb, not found in c#
using Microsoft.VisualBasic;
//this was added using NUGetPackageManager console PM>install-package linqtotwitter
using LinqToTwitter;  //version 3.1.2
 
/*
 * How to test linqToTwitter with PinAuthentication
 * This is the simplest way to test as there are no callbacks from twitter.
 * Written by David Dold on April 7, 2015 with VB 2012 
 * 
 */
 
/* Before you begin, in dev.twitter.com, setup up a test app under Tools, Manage Your Apps
 * Then add the values in base64 copy and paste directly from twitter into your consumerKey, consumeSecret
 * 
 * <appSettings>
    <add key="consumerKey" value="from dev.twitter" />
    <add key="consumerSecret" value="from dev.twitter" />
    <add key="ClientSettingsProvider.ServiceUri" value="" />  //
  </appSettings>
*/
 
/* compare your packagaes.config with the requirements on codeplex
<?xml version="1.0" encoding="utf-8"?>
<packages>
  <package id="Microsoft.Bcl" version="1.1.9" targetFramework="net45" />
  <package id="Microsoft.Bcl.Build" version="1.0.21" targetFramework="net45" />
  <package id="Microsoft.Bcl.Compression" version="3.9.85" targetFramework="net45" />
  <package id="Microsoft.Net.Http" version="2.2.28" targetFramework="net45" />
  <package id="Rx-Core" version="2.2.5" targetFramework="net45" />
  <package id="Rx-Interfaces" version="2.2.5" targetFramework="net45" />
  <package id="Rx-Linq" version="2.2.5" targetFramework="net45" />
  <package id="Rx-Main" version="2.2.5" targetFramework="net45" />
  <package id="Rx-PlatformServices" version="2.2.5" targetFramework="net45" />
</packages>
*/
 
namespace TwitterTester
{
    public partial class Form1 : Form
    {
        //be explicit, what is this vb?
        PinAuthorizer auth = null;
        public Form1()
        {
            InitializeComponent();
            try
            {
                auth = new PinAuthorizer()
                {
                    CredentialStore = new InMemoryCredentialStore
                    {
                        ConsumerKey = ConfigurationManager.AppSettings["consumerKey"],
                        ConsumerSecret = ConfigurationManager.AppSettings["consumerSecret"]
                    },
                    GoToTwitterAuthorization = pageLink => Process.Start(pageLink),
                    GetPin = () => 
                    {
                        return (string)Interaction.InputBox("Enter Pin", "Twitter", string.Empty, -1,-1);
                    }
                };
                //this returns void, assuming it throws an exception if something is wrong
                //"waiting" is on twitter, this will load the default browser, and then prompt the currently logged in twitter users with "Authorize <<your twitter app>> to use your account?"  
                //from credentials above created in dev.twitter.com "Tools-> Manage Your Apps"
                //you cannot "wait" on this, the handoff to the browswe will not occur
                auth.AuthorizeAsync();
                //this is not blocking, ideally this would block until authorized and then enable the tweet button...  
                button1.Enabled = true;
            }
            catch (Exception E)
            {
                lbInfo.Text = "Exception Constructor: " + E.Message;
            }
 
        }
 
        private void button1_Click(object sender, EventArgs e)
        {
            try
            {
                using (TwitterContext twitterCtx = new TwitterContext(auth))
                {
                    //in pure event driven programming this should be a BeginTweet, then a callback to OnFailedTweet or OnCompleteTweet.  
                    //MS added this async/await in vs 2012, .net 45, supposedly this is the same, meaning, this is not blocking and IDispatch is still processing windows messages
                    Task<LinqToTwitter.Status> task = twitterCtx.TweetAsync(textBox1.Text);
                    task.Wait();
  
                    //Task.Result is of type LinqToTwitter.Status
                    if (task != null)
                        if (task.IsCompleted)
                            listBox1.Items.Add("tweeted: ID: " + task.Result.ID);
                        else
                            listBox1.Items.Add("Task failed");
                    else
                        listBox1.Items.Add("failed");
 
                }
            }
            catch(Exception E)
            {
                lbInfo.Text="Exception TweetAsync: "+E.Message;    
            }
        }
    }
}

Run the app.

 
The oAuth requires a code provided by twitter.com to authenticate the currently logged in user to the default browser.  Cut and past the code into the (vb) message box.

Tweet away.

Good luck,

~David