C# - Check if user is logged in Facebook

Question

I'm working on a Windows Phone Silverlight app and I want to make a simple login via Facebook(browser). Is there a way to check if the user is logged in Facebook? I redirect the user to Facebook page with this statement:

Launcher.LaunchUriAsync(new Uri("http://www.facebook.com"));

Check [this](http://codes2know.com/facebook-integration-with-c-net/) out. It has information about FB Graph API — Kasun Koswattha, Apr 27 '16 at 19:59

score 0 · Accepted Answer · answered Apr 27 '16 at 20:14

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I don't know if you are using the windows SDK for facebook (https://github.com/Microsoft/winsdkfb) but it is a third party sdk approved by Facebook.

Before using that SDK you should set up the Facebook developer page for your app. (https://developers.facebook.com/docs/apis-and-sdks)

I hope that helps.

answered Apr 27 '16 at 20:14

Cabrra

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Are you using the Microsoft SDK for Facebook? – Cabrra Apr 28 '16 at 12:39

score 0 · Answer 2 · edited May 23 '17 at 11:59

Here is a WPF example that uses the WebBrowser class to get a token: Facebook OAuth in WPF & C# Example

Obviously the WPF related things might differ a bit, but it should at least point you to getting the info you need out of the process. As far as checking whether the user is logged in, I pretty much just checked whether the token is valid by making some http request that uses it and seeing whether it was successful (used a REST client for that).

There was a way to directly check token validity via the Facebook APIs but that was deprecated last I checked.

C# - Check if user is logged in Facebook

2 Answers2