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Does anyone know of an ASP.NET guide to implementing OpenID and what information can be returned by the OpenID provider? I understand you can get the email address but if someone logs in with their Google OpenID can you get access to their addresses?
Yes, OpenID Providers can and often do offer ‘claims’ or ‘attributes’ about the people logging in if the OpenID relying party requests them and the user consents to these data being shared.
If you use DotNetOpenAuth for your ASP.NET OpenID library, it has built-in support for several ways of getting these attributes but keeps it simple on your side to get at them regardless of which way the Provider offers them. If you download the library it comes with a sample of how to do this.
As far as work address, and some other attributes specific to certain domains (domains of data–not Internet domains) very few Providers offer them. The best you can do is get “full address” and ask the user if that’s the one they want to use.