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私は現在、WinPhanDev コミュニティの開発者に関する情報が読み込まれた XML を読み込み、すべての開発者によるツイートを取得するアプリに取り組んでいます。また、特定の開発者が公開したすべての公開済みアプリを表示することも想定されていますが、これは部分的に機能しています。

http://zunderstorehost.azurewebsites.net/api/から取得した json を解析するコードを実行すると、5 番目/6 番目または 7 番目の開発者をコレクションに追加するときに、コードを変更せずにランダムな例外が発生します。

すべてのデータを処理するメソッド全体には、次のコードが含まれています。

async void webClient_DownloadStringCompleted(object sender, System.Net.DownloadStringCompletedEventArgs e)
{
   if (e.Error == null)
   {
       string _proimage = "";
       me.twitterClient = new RestClient("https://api.twitter.com");
       me.tapiAuthToken = EncodeTo64(me.tapiCKey + ":" + me.tapiCSecret);
       // Authorize app for Twitter
       me.tweetReq = new RestRequest("oauth2/token", Method.POST);
       me.tweetReq.AddHeader("Authorization", "Basic " + me.tapiAuthToken);
       me.tweetReq.AddHeader("Host", "api.twitter.com");
       me.tweetReq.AddHeader("User-Agent", "WinPhanDevs");
       me.tweetReq.AddHeader("Content-Type", "application/x-www-form-urlencoded;charset=UTF8");
       me.tweetReq.AddParameter("grant_type", "client_credentials");
       try
       {
            me.resp = await me.twitterClient.GetResponseAsync(me.tweetReq);
            me.token = Newtonsoft.Json.JsonConvert.DeserializeObject<OAuthToken>(me.resp.Content);
       }
       catch (Exception ex)
       {
            ErrorClass error = Newtonsoft.Json.JsonConvert.DeserializeObject<ErrorClass>(me.resp.Content);
            App.ViewModel.Devs.Add(new WinPhanDevs.ViewModels.DevViewModel() { Name = error.errors[0].label, Twitter = error.errors[0].message, PublisherID = ex.Message, Site = "", StoryLink = "", Image= "", Tweets = null });
       }

       XMLData = XElement.Parse(e.Result);
       var devs = from el in XMLData.Descendants("dev") select el;
       foreach (XElement el in devs)
       {
            #region "Load devs tweets"
            twts = new ObservableCollection<TweetViewModel>();
            if(el.Attribute("twitter").Value != "")
            {
                // Fetch tweets
                me.twitterClient = new RestClient(me.tapi);
                me.tweetReq = new RestRequest("search/tweets.json", Method.GET);
                me.tweetReq.AddHeader("Authorization", "Bearer " + me.token.access_token);
                me.tweetReq.AddHeader("Accept-Encoding", "gzip");
                me.tweetReq.AddParameter("q", "from:" + el.Attribute("twitter").Value + " exclude:retweets exclude:replies");

                string[] _createdAt = new string[20];
                string[] _text = new string[20];
                string[] _link = new string[20];
                string[] _image = new string[20];

                Peep res = await ExecuteAsync<Peep>(me.tweetReq, me.tapi);
                Status[] statuses = res.statuses;

                int i = 0;
                foreach (Status tweet in statuses)
                {
                    DateTime time = DateTime.ParseExact(tweet.created_at, "ddd MMM dd HH:mm:ss zzz yyyy", new System.Globalization.CultureInfo("en-US"));
                    _createdAt[i] = time.ToShortDateString() + " " + time.ToShortTimeString();
                    _text[i] = tweet.text;
                    if (tweet.entities.urls.Length > 0) { _link[i] = tweet.entities.urls[0].expanded_url; _text[i] = _text[i].Replace(tweet.entities.urls[0].url, ""); } else { _link[i] = ""; }
                    if (tweet.entities.media != null) { _image[i] = tweet.entities.media[0].media_url; _text[i] = _text[i].Replace(tweet.entities.media[0].url, ""); } else { _image[i] = ""; }
                    twts.Add(new WinPhanDevs.ViewModels.TweetViewModel() { Date = _createdAt[i], Tweet = _text[i], Link = _link[i] });
                    i++;
                }
                _proimage = statuses[0].user.profile_image_url;
            }
            #endregion
            #region "Load devs apps"
            // Gets an IndexOutOfBounds/TargetInvocation/NullReference
            // exception in here while adding the 5th/6th or 7th developer,
            // none of the exceptions are caught.
            // Without this whole region the app runs smooth.
            try
            {
                RestClient devClient = new RestClient("http://zunderstorehost.azurewebsites.net/api/");
                string dev = el.Attribute("pubid").Value;
                //dev = dev.Replace(" ", "+");
                RestRequest devReq = new RestRequest("WP8StoreAppList/Query/" + dev, Method.GET);
                response = await devClient.GetContentAsync(devReq);
                AppClass[] apps = JsonConvert.DeserializeObject<AppClass[]>(response);
                Apps = new ObservableCollection<AppViewModel>();
                foreach (AppClass app in apps)
                {
                    string _price;
                    if (app.Offers.Count > 1)
                    {
                        if (app.Offers[0].Price != "0")
                        {
                            _price = app.Offers[0].DisplayPrice + " (Trial available)";
                        }
                        else
                        {
                            _price = app.Offers[1].DisplayPrice + " (Trial available)";
                        }
                    }
                    else
                    {
                        if (app.Offers[0].Price == "0")
                        {
                            _price = "FREE";
                        }
                        else
                        {
                            _price = app.Offers[0].DisplayPrice;
                        }
                    }
                    try
                    {
                        Apps.Add(new AppViewModel()
                        {
                            Name = app.Name,
                            ReleaseDate = app.ReleaseDate,
                            GUID = app.Guid,
                            Icon = app.Icon,
                            Price = _price,
                            Publisher = app.Publisher,
                            Version = app.Version,
                            StoreLink = ""
                        });
                    }catch (Exception ex)
                    {
                        Devs.Add(new DevViewModel() { Name = "Failed to add!", Apps = null, Image = "", PublisherID = "", Site="", StoryLink="", Tweets=null, Twitter=ex.Message});
                    }
                }
            }catch (Exception ex)
            {
                Devs.Add(new DevViewModel() { Name = "Failed to add!", Apps = null, Image = "", PublisherID = "", Site = "", StoryLink = "", Tweets = null, Twitter = ex.Message });
            }
            #endregion
            try
            {
                Devs.Add(new DevViewModel() { Name = el.Attribute("name").Value, Twitter = el.Attribute("twitter").Value, Site = el.Attribute("web").Value, PublisherID = el.Attribute("pubid").Value, StoryLink = el.Attribute("story").Value, Tweets = twts, Image = _proimage, Apps = Apps });
            }catch(Exception ex)
            {
                Devs.Add(new DevViewModel() { Name = "Failed to add!", Apps = null, Image = "", PublisherID = "", Site = "", StoryLink = "", Tweets = null, Twitter = ex.Message });
            }
        }
        this.IsDataLoaded = true;
    }
    else
    {
        Devs.Add(new DevViewModel() { Name = e.Error.Source, Twitter = e.Error.Message, PublisherID = e.Error.InnerException.Message, Site = "", StoryLink = "" });
    }
}

プロジェクト全体はhttps://github.com/IzaacJ/WinPhanDevsで入手でき、この問題が発生する特定のファイルは MainViewModel.cs です。

この問題を解決するための助けをいただければ幸いです。

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