Windows phone 7 向API发送多个请求时出现webclient I/O错误

我想做一个Twitter情绪分析Windows Phone应用程序

该应用程序根据用户输入的查询词检索所有相关tweet。例如，如果我在输入搜索框中输入“Windows Phone”，结果将显示包含“Windows Phone”术语的所有推文

这是代码（我从中获得）

将POST数据上载到API中

    public void UploadData(Twit tweetPerSend)
    {
        if (NetworkInterface.GetIsNetworkAvailable())
        {
            chatterbox.Headers[HttpRequestHeader.ContentType] = "application/x-www-                       form-urlencoded";
            chatterbox.Headers["X-Mashape-Authorization"] = "MXBxYmptdjhlbzVnanJnYndicXNpN2NwdWlvMWE1OjA0YTljMWJjMDg4MzVkYWY2YmIzMzczZWFkNDlmYWRkNDYzNGU5NmI=";

            var Uri = new Uri("https://chatterboxco-sentiment-analysis-for-social-media---nokia.p.mashape.com/sentiment/current/classify_text/");

            StringBuilder postData = new StringBuilder();
            postData.AppendFormat("{0}={1}", "lang", HttpUtility.UrlEncode("en"));
            postData.AppendFormat("&{0}={1}", "text", HttpUtility.UrlEncode(tweetPerSend.DecodedText));
            postData.AppendFormat("&{0}={1}", "exclude", HttpUtility.UrlEncode("is")); // disesuaikan 
            postData.AppendFormat("&{0}={1}", "detectlang", HttpUtility.UrlEncode("0"));
            chatterbox.UploadStringAsync(Uri, "POST", postData.ToString());
            chatterbox.UploadStringCompleted += new UploadStringCompletedEventHandler(chatterbox_UploadStringCompleted);

        }
    }


    void chatterbox_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
    {
        var chatterbox = sender as WebClient;
        chatterbox.UploadStringCompleted -= chatterbox_UploadStringCompleted;
        string response = string.Empty;
        if (!e.Cancelled)
        {
            response = HttpUtility.UrlDecode(e.Result);
            nilaiKlasifikasi = ParsingHasil(response);
            MessageBox.Show(nilaiKlasifikasi.ToString()); //just testing
            //textBlock1.Text = response;
        }
    }

    private double ParsingHasil(String response)
    {

        var result = Regex.Match(@response, @"(?<=""value"": )(-?\d+(\.\d+)?)(?=,|$)");
        Debug.WriteLine(result);
        double hasil = Convert.ToDouble(result.ToString());
        //return Convert.ToInt32(result);
        return hasil;

    }

public void上传数据（Twit-tweetPerSend）
{
if（NetworkInterface.GetIsNetworkAvailable（））
{
chatterbox.Headers[HttpRequestHeader.ContentType]=“应用程序/x-www-表单urlencoded”；
chatterbox.Headers[“X-Mashape-Authorization”]=“mxbxymptjhlbzvnanjnyndicxnpn2nwdwlvmwe1oja0ytljmwjjjmdg4mzvkywy2ymizcmzczzwfkndlmywrkndyzngu5nmi=”；
var Uri=新的Uri（“https://chatterboxco-sentiment-analysis-for-social-media---nokia.p.mashape.com/sentiment/current/classify_text/");
StringBuilder postData=新建StringBuilder（）；
appendData.AppendFormat（“{0}={1}”，“lang”，HttpUtility.UrlEncode（“en”）；
appendData.AppendFormat（&{0}={1}”，“text”，HttpUtility.UrlEncode（tweetPerSend.DecodedText））；
postData.AppendFormat（&{0}={1}”，“exclude”，HttpUtility.UrlEncode（“is”）；//disesuaikan
appendData.AppendFormat（“&{0}={1}”，“detectlang”，HttpUtility.UrlEncode（“0”）；
UploadStringAsync（Uri，“POST”，postData.ToString（））；
chatterbox.UploadStringCompleted+=新的UploadStringCompletedEventHandler（chatterbox\u UploadStringCompleted）；
}
}
void chatterbox_UploadStringCompleted已完成（对象发送方，UploadStringCompletedEventArgs e）
{
var chatterbox=作为网络客户端的发送方；
chatterbox.UploadStringCompleted-=chatterbox\u UploadStringCompleted；
字符串响应=string.Empty；
如果（！e.取消）
{
response=HttpUtility.UrlDecode（e.Result）；
nilaiKlasifikasi=Parsingasil（响应）；
MessageBox.Show（nilaiklasifkasi.ToString（））；//只是测试
//textBlock1.Text=响应；
}
}
专用双PARSINGASIL（字符串响应）
{
var result=Regex.Match（@response，@）（？您必须一次同步执行一个UploadStringAsync。（即，在UploadStringCompleted处理程序中链执行下一个UploadStringAsync）

或者，为每个UploadStringAsync创建一个新的WebClient。
在哪一行出现此错误/异常？@PeterRitchie:在这一行“chatterbox.UploadStringAsync（Uri，“POST”，postData.ToString（））；”调试代码后，我意识到，连接请求api
foreach的方法（twitterResults.results中的Twit Tweet）thisApp.klasifikasi.UploadData（推特）；//请求
，尽管过去的过程尚未完成，但仍会继续触发..如何解决此问题？如我的回答中所述，您必须等到调用UploadStringCompleted处理程序后再调用下一个UploadDataHow知道UploadStringCompleted是否被调用/完成？您有处理上载的代码tringCompleted事件——这就是你知道的。
           TwitterService.Search(
            text,
           (items) => { PositiveList.ItemsSource = items; },
           (exception) => { MessageBox.Show(exception.Message); },
           null
           );

    public void UploadData(Twit tweetPerSend)
    {
        if (NetworkInterface.GetIsNetworkAvailable())
        {
            chatterbox.Headers[HttpRequestHeader.ContentType] = "application/x-www-                       form-urlencoded";
            chatterbox.Headers["X-Mashape-Authorization"] = "MXBxYmptdjhlbzVnanJnYndicXNpN2NwdWlvMWE1OjA0YTljMWJjMDg4MzVkYWY2YmIzMzczZWFkNDlmYWRkNDYzNGU5NmI=";

            var Uri = new Uri("https://chatterboxco-sentiment-analysis-for-social-media---nokia.p.mashape.com/sentiment/current/classify_text/");

            StringBuilder postData = new StringBuilder();
            postData.AppendFormat("{0}={1}", "lang", HttpUtility.UrlEncode("en"));
            postData.AppendFormat("&{0}={1}", "text", HttpUtility.UrlEncode(tweetPerSend.DecodedText));
            postData.AppendFormat("&{0}={1}", "exclude", HttpUtility.UrlEncode("is")); // disesuaikan 
            postData.AppendFormat("&{0}={1}", "detectlang", HttpUtility.UrlEncode("0"));
            chatterbox.UploadStringAsync(Uri, "POST", postData.ToString());
            chatterbox.UploadStringCompleted += new UploadStringCompletedEventHandler(chatterbox_UploadStringCompleted);

        }
    }


    void chatterbox_UploadStringCompleted(object sender, UploadStringCompletedEventArgs e)
    {
        var chatterbox = sender as WebClient;
        chatterbox.UploadStringCompleted -= chatterbox_UploadStringCompleted;
        string response = string.Empty;
        if (!e.Cancelled)
        {
            response = HttpUtility.UrlDecode(e.Result);
            nilaiKlasifikasi = ParsingHasil(response);
            MessageBox.Show(nilaiKlasifikasi.ToString()); //just testing
            //textBlock1.Text = response;
        }
    }

    private double ParsingHasil(String response)
    {

        var result = Regex.Match(@response, @"(?<=""value"": )(-?\d+(\.\d+)?)(?=,|$)");
        Debug.WriteLine(result);
        double hasil = Convert.ToDouble(result.ToString());
        //return Convert.ToInt32(result);
        return hasil;

    }