as you say using Facebook C# SDK, then here is path and some code for canvas application:
1- Create your web application from visual studio
2- install nuget and get by nuget Facebook C# SDK
3- from https://developers.facebook.com/apps/ create and configure your app.
4- Your web config for facebook integration :
<configuration>
<configSections>
<section name="facebookSettings" type="Facebook.FacebookConfigurationSection" />
</configSections>
<facebookSettings appId="123..." appSecret="abc...." siteUrl="http://apps.facebook.com/myapp/" canvasPage="http://app.facebook.com/myapp" secureCanvasUrl="https://myapp.com/" canvasUrl="http://myapp.com/" cancelUrlPath="http://www.facebook.com/" />
...
By using sdk, you can parse signed request or cookie written by facebook js sdk
FacebookWebContext fbWebContext = new FacebookWebContext();
//Check if user auhtenticated
bool IsAuthenticated = fbWebContext.IsAuthenticated();
Here you can have friend count by:
FacebookWebClient fbWebClient = new FacebookWebClient();
dynamic result = fbWebClient.Get("me/friends");
var friends = result["data"];
int frienCount = friends.Count;
For the client side:
<body>
<div id="fb-root"></div>
<script>
window.fbAsyncInit = function () {
FB.init({
appId: '123...',
status: true,
cookie: true,
xfbml: true,
oauth:true });
};
(function () {
var e = document.createElement('script'); e.async = true;
e.src = document.location.protocol + '//connect.facebook.net/en_US/all.js';
document.getElementById('fb-root').appendChild(e);
} ());
<!-- rest of your html -->
</body>
For login & asking permission from javascript
FB.getLoginStatus(function(response) {
console.log( response );
if ((response.status)&&(response.status=='connected')) {
//successs
} else {
//user declined
}, {scope:'user_likes, offline_access'}
});
I prefer in my project to client side login thus not yet registered user have landing page, if for example submit form then I call code block above.
Note: you have to set P3P header for Internet explorer to read/write cookie depending of your server. for IIS, global.asax:
protected void Application_BeginRequest(Object sender, EventArgs e)
{
HttpContext.Current.Response.AddHeader("p3p", "CP="CAO PSA OUR"");
}
Volià
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