问题
How do i get app_data querystring from a Facebook webforms app? I want to be able to send some info in the querystring so i can display different home screen on my app. The app is sittin in a page tab.
Example: http://www.facebook.com/pages/APPNAME/157772164271503?sk=app_230501256972470&app_data=Page.aspx
How do i get "Page.aspx" from app_data? I need it to redirect the user to a different page from Default.aspx
I found the solution. Get Querystring from facebook tab app using asp.net
using Newtonsoft.Json.Linq;
using System.Text;
public partial class Page_Default : System.Web.UI.Page
{
protected string output = "";
protected void Page_Load(object sender, EventArgs e)
{
output = "Whole thing:" +Request.Form["signed_request"];
output += "Second part:" + Request.Form["signed_request"].Split('.')[1];
try
{
string payload = Request.Form["signed_request"].Split('.')[1];
var encoding = new UTF8Encoding();
var decodedJson = payload.Replace("=", string.Empty).Replace('-', '+').Replace('_', '/');
var base64JsonArray = Convert.FromBase64String(decodedJson.PadRight(decodedJson.Length + (4 - decodedJson.Length % 4) % 4, '='));
var json = encoding.GetString(base64JsonArray);
var o = JObject.Parse(json);
output += "Decoded:" + json;
bool liked = (bool)o.SelectToken("page.liked");
output += "Liked:" + liked.ToString();
}
catch (Exception ex)
{
output += "Extract failed: " + ex.Message;
}
}
}
Also this post was helpfull
just be shure to add the direct page in facebook app settings ex. www.site.com/deafult.aspx not www.site.com
回答1:
In the JSON array that facebook posts, one of the top level keys is 'app_data', if it's specified. So you can to it just as you did for 'liked' but instead of 'page.liked' it would just be 'app_data' (and not a boolean)
回答2:
facebook does not pass the querystring to your page. it does a post to your page from a different url, so you wont be able to read the querystring from page load. I havent tried this, but you could try accessing window.top.location.search in the js of the page.
来源:https://stackoverflow.com/questions/6625242/facebook-webforms-app-get-app-data-querystring