How to use CanvasAuthorizer

I download the latest version and successfully tested the Mvc3Web sample. I tried to extend it to get email and friends but the CanvasAuthorizer is failing. The code below开发者_如何学Python is not working: CanvasAuthorizer _authorizer = new CanvasAuthorizer {Permissions = {"publish_stream,offline_access"};

throwing an exception complaining about appId being empty. Any idea how to acheive this? It's pitty that the samples are missing the permissions request functionalities.

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change the code to use permissions as array.

CanvasAuthorizer _authorizer = new CanvasAuthorizer {Permissions = new[] {"publish_stream", "offline_access"}};

Update: Also make sure to have proper app settings in web.config for the application. or set it programatically (during application_beginrequest)

FacebookApplication.SetApplication(new DefaultFacebookApplication{ AppId = "...", AppSecret = "..." });