This is an OAuth2 client to use with the DotNetOpenAuth project. The following code is an adaptation of Matt Johnson's DotNetOpenAuth.GoogleOAuth2 project

1. Setup your LinkedIn App using the LinkedIn Developer Network.

2. Compile from source and reference. (NuGet coming soon)

3. Register the client instead of the existing LinkedIn OpenId client.

   var client = new LinkedInOAuth2Client("yourClientId", "yourClientSecret");
   OAuthWebSecurity.RegisterClient(client);
   

Just like any other OAuthWebSecurity client, except you need one extra hook:

    // add this line
    LinkedInOAuth2Client.RewriteRequest();

    // it belongs right before your existing call to
    OAuthWebSecurity.VerifyAuthentication(....)

This is needed because LinkedIn requires that any extra querystring parameters for the redirect be packed into a single parameter called state. Since OAuthWebSecurity needs two parameters, __provider__ and __sid__ - we have to rewrite the url.

I don't work for Google, Microsoft, or DNOA. This is released under the MIT licence. Do what you want with it.