CODEWITHSUNDEEP
jsonwcfrestserializationtwitter
Mr. TA
Mr. TA

Reputation: 5359

WCF REST JSON collection null with Twitter

I'm issuing the friends/ids call like so:

GET /1.1/friends/ids.json?screen_name=blablabla HTTP/1.1

A valid response is issued:

{"ids":[97500486,32947624,8884440,2022687,28741369,33978239,10312111,950922,7682036,21688137,7696145,15876098],"next_cursor":0,"next_cursor_str":"0","previous_cursor":0,"previous_cursor_str":"0"}

My interface looks like this:

[OperationContract(Name = "ids.json")]
[WebGet(ResponseFormat = WebMessageFormat.Json, UriTemplate="ids.json?user_id={userId}&screen_name={screenName}")]
FriendsIdsResponse Ids(long? userId, string screenName);

[DataContract]
public class FriendsIdsResponse
{
  public FriendsIdsResponse()
  {
  }

  [DataMember(Name = "ids")]
  public long[] Ids { get; set; }
  [DataMember(Name = "previous_cursor")]
  public int PreviousCursor { get; set; }
  [DataMember(Name = "next_cursor")]
  public int NextCursor { get; set; }
}

No matter what type Ids is (long[], IList, List, etc.), it always comes back null. If I instantiate it to an empty List in ctor, it has Count==0.

UPDATE WCF configs, as requested:

<system.serviceModel>
    <client>
        <endpoint contract="TA.Twitter.Service.IFriends, TA.Twitter.Interfaces"
                            address="https://api.twitter.com/1.1/friends/"
                            binding="webHttpBinding" bindingConfiguration="WebHttpBinding"
                            ></endpoint>
    </client>
    <bindings>
        <webHttpBinding>
            <binding name="WebHttpBinding" allowCookies="true">
                <security mode="Transport">
                </security>
            </binding>
        </webHttpBinding>
    </bindings>
</system.serviceModel>

Upvotes: 3

Views: 210

Answers (1)

Cybermaxs
Cybermaxs

Reputation: 24558

Not a complete answer, but are you restricted to use WCF to invoke Tweeter API ? I'm a big fan of WCF, but for Twitter there are already many .net Librairies. I understand there is a challenge in WCF but I prefer to not reinvent the wheel each time.

Tweetsharp seems to be a popular .net library for Twitter API access.

Suppose you already have OAuth tokens, get friends is done with less than 10 lines of code.

    var service = new TweetSharp.TwitterService("consumerKey", "consumerSecret");
    service.AuthenticateWith("accessToken", "accessTokenSecret");

    var friends = service.ListFriendIdsOf(new TweetSharp.ListFriendIdsOfOptions() { ScreenName = "blabla" });
    foreach (var friend in friends)
    {
        Console.WriteLine("new friend :{0} ", friend);
    }

Less than 10 lines, less than 10 minutes, seems to be a good compromise

Upvotes: 1

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