oauth - How does GetExternalLoginInfoAsync() work? (MVC5) -

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i have simple question, time of googling didn't give me answer. i'm using mvc 5 project , using owin oauth features facebook login.

i'm using recommended way first creating challange result:

return new challengeresult(provider, url.action("externallogincallback", "account", new { returnurl = returnurl }));

and in callback function capturing 

var logininfo = await authenticationmanager.getexternallogininfoasync();

now question is, method (getexternallogininfoasync) works? need access info (logininfo) provided callback later on, should write db, etc or there better way?


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