Masto.NET is a .net standard library for Mastodon written in C#.

Work In Progress. You can try it, but be aware there's probably gonna be breaking changes until a stable version is available. Also, don't send Pull Request before opening an issue.

You need to obtain a ClientId and a ClientSecret for your app, directly from the client, on the target Mastodon instance. Call the static CreateApp method :

  var appRegistration = await MastodonClient.CreateApp("instanceUrl", "Your app name", Scope.Read | Scope.Write | Scope.Follow);

The appRegistration object must be saved.

Now you can create a client, and connect the user (not recommended, prefer OAuth when you can) :

var client = new MastodonClient(appRegistration);
var auth = await client.ConnectWithPassword("email", "password");

The recommended way to login is to use OAuth. You open a web browser and let the user login himself on his instance.

var client = new MastodonClient(appRegistration);
var url = client.OAuthUrl();
OpenBrowser(url);

You can either embed a WebView in you app, or open an external browser. When the user allowed your app to access its account, he is redirected to a web page with an auth code.

You have several option to get the code :

• Ask the user to copy and paste it in your app (easy for you, but not user-friendly)
• If you have embedded a WebView in your app, you can read the final page. The code is in the url, and in the webpage embedded in a <code> tag
  

If you are in a web context, you can set the final page url, and the user will be redirected directly to your server with the code. Just add your url to the OAuthUrl method.

var url = client.OAuthUrl(myRedirectPage);

Now this code will let you get the access token for the user

var client = new MastodonClient("instanceUrl", appRegistration);
var auth = await client.ConnectWithCode(authCode);

When you have the access token, you should save it in the app, and use it every time you restart the app. You just need to add it to the client constructor.

var client = new MastodonClient("instanceUrl", appRegistration, auth.AccessToken);

Now you can call all the API methods. See Mastodon API overview

You can use the TimelineStreaming to be notified for every status, notification and deletion on a timeline.

var client =  new MastodonClient("instance", appRegistration, auth);
var streaming = client.GetUserStreaming();

// Register events
streaming.OnUpdate = OnStatusReceived;
streaming.OnNotification = OnNotificationReceived;
streaming.OnDelete = OnDeleteReceived;

// Start streaming
streaming.Start();


// ...

// Stop streaming
streaming.Stop();

Some instances only accept TLS 1.2 requests, but .net Framework only support TLS 1.2 by default on version 4.6 and above If you are on version 4.5.2 or earlier, you should force using TLS 1.2 by this line of code before any request :

ServicePointManager.SecurityProtocol = SecurityProtocolType.Tls12;