Hi Prabir, I'm opening the issue per your request in this discussion:
http://facebooksdk.codeplex.com/discussions/284103

It seems like every time I try to login I get a KeyNotFoundException. It's rendering the application unusable since there's no graceful way out of this exception, at least none that I know. Thank you for your quick response!

comments from the discussion thread:
johnwarns
Sat at 2:16 PM


any one else getting a KeyNotFoundException error when running the Windows phone sample?

john

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Bob_12345
Today at 10:14 PM


I just started having this issue recently, out of the blue. The following exception occurs:

System.Collections.Generic.KeyNotFoundException was unhandled
Message=KeyNotFoundException
StackTrace:

   at System.ThrowHelper.ThrowKeyNotFoundException()
   at System.Collections.Generic.Dictionary`2.get_Item(String key)
   at Facebook.JsonObject.get_Item(String key)
   at Facebook.FacebookOAuthClient.BuildExchangeCodeForAccessTokenResult(String json)
   at Facebook.FacebookOAuthClient.<ExchangeCodeForAccessTokenAsync>b__6(String json)
   at Facebook.FacebookOAuthClient.<>c__DisplayClass9.<OAuthRequestAsync>b__8(Object o, OpenReadCompletedEventArgs e)
   at FluentHttp.HttpHelper.OnOpenReadCompleted(OpenReadCompletedEventArgs args)
   at FluentHttp.HttpHelper.ResponseCallback(IAsyncResult asyncResult, Object userToken)
   at FluentHttp.HttpHelper.OpenReadAsync(Object userToken)
   at FluentHttp.HttpHelper.OpenReadAsync()
   at Facebook.FacebookOAuthClient.<>c__DisplayClass9.<OAuthRequestAsync>b__8(Object o, OpenReadCompletedEventArgs e)
   at FluentHttp.HttpHelper.OnOpenReadCompleted(OpenReadCompletedEventArgs args)
   at FluentHttp.HttpHelper.ResponseCallback(IAsyncResult asyncResult, Object userToken)
   at FluentHttp.HttpHelper.<>c__DisplayClass2.<OpenReadAsync>b__0(IAsyncResult ar)
   at System.Net.Browser.ClientHttpWebRequest.<>c__DisplayClassa.<InvokeGetResponseCallback>b__8(Object state2)
   at System.Threading.ThreadPool.WorkItem.WaitCallback_Context(Object state)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadPool.WorkItem.doWork(Object o)
   at System.Threading.Timer.ring()

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Bob_12345
Today at 10:24 PM


I think the indexer in that Json object implementation is failing. It's really rendering the whole application useless. I think the problem is here, but I'm not 100% certain:

private object BuildExchangeCodeForAccessTokenResult(string json)
{
var returnParameter = new JsonObject();
FacebookUtils.ParseQueryParametersToDictionary("?" + json, returnParameter);

// access_token=string&expires=long or access_token=string
// Convert to JsonObject to support dynamic and be consistent with the rest of the library.
var jsonObject = new JsonObject();
jsonObject["access_token"] = returnParameter["access_token"]; <<<<<<<<Here
....

//Since his/her indexer implementation for JsonObject in JsonSimple.CS, no check for "ContainsKey":
public object this[string key]
{
get { return _members[key]; }
set { _members[key] = value; }
}


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prabirshrestha
Coordinator
Today at 10:28 PM


seems like it needs the following line of code

var jsonObject = new JsonObject();

if(jsonObject.ContainsKey("access_token"))
jsonObject["access_token"] = returnParameter["access_token"];


could you either file a new issue or send a pull request.

thanks,

prabir

        var jsonObject = new JsonObject();

        if (returnParameter.ContainsKey("access_token"))
        {
            jsonObject["access_token"] = returnParameter["access_token"];
        }