在 WP7 上陷入网络服务困境

Question

昨天我确实询问了如何在 Windows Phone 7 上使用 Web 服务从复杂的 xml 文件中提取一些数据，但不幸的是我没有得到答案，而且我仍然陷入困境。 这是我编写的 C# 代码，但没有在应用程序的屏幕上显示数据：

    public MainPage()
    {
        InitializeComponent();

        SupportedOrientations = SupportedPageOrientation.Portrait | SupportedPageOrientation.Landscape;

        Uri url = new Uri("http://www.google.com/ig/api?weather=paris", UriKind.Absolute);
        WebClient client = new WebClient();
        client.DownloadStringCompleted += new DownloadStringCompletedEventHandler(client_DownloadStringCompleted);
        client.DownloadStringAsync(url);
    }


 void client_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
    {
        if (e.Error == null)
        {
            ListBoxItem areaItem = null;
            StringReader stream = new StringReader(e.Result);
            XmlReader reader = XmlReader.Create(stream);
            string day = String.Empty;
            string areaName = String.Empty;
            string low = String.Empty;
            string high = String.Empty;
            string condition = String.Empty;

            while (reader.Read())
            {
                if (reader.NodeType == XmlNodeType.Element)
                {
                    switch (reader.Name)
                    {

                        case ("day_of_week"):
                            {
                                if (true == reader.MoveToFirstAttribute())
                                {
                                    reader.MoveToContent();
                                    day = reader.ReadElementContentAsString();
                                    day = reader.Value.ToString();
                                    areaItem = new ListBoxItem();
                                    areaItem.Content = day;
                                    listBox1.Items.Add(areaItem);
                                }

                            } break;
                        case ("low"):
                            {
                                if (true == reader.MoveToFirstAttribute())
                                {
                                    reader.MoveToContent();
                                    low = reader.ReadElementContentAsString();
                                    low = reader.Value.ToString();
                                    areaItem = new ListBoxItem();
                                    areaItem.Content = low;
                                    listBox1.Items.Add(areaItem);
                                }

                            } break;
                        case ("high"):
                            {
                                if (true == reader.MoveToFirstAttribute())
                                {
                                    reader.MoveToContent();
                                    high = reader.ReadElementContentAsString();
                                    high = reader.Value.ToString();
                                    areaItem = new ListBoxItem();
                                    areaItem.Content = high;
                                    listBox1.Items.Add(areaItem);
                                }

                            } break;
                        case ("condition"):
                            {
                                if (true == reader.MoveToFirstAttribute())
                                {
                                    reader.MoveToContent();
                                    condition = reader.ReadElementContentAsString();
                                    condition = reader.Value.ToString();
                                    areaItem = new ListBoxItem();
                                    areaItem.Content = condition;
                                    listBox1.Items.Add(areaItem);
                                }

                            } break;
                    }
                }

            }
        }      

    }
}

}

Answer 1

您使一切变得过于复杂，它非常简单，使用等等

public class ForecastItem
{
 public string a {get; set;}
 public string b {get; set;}
}

，

private void forecastReader_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs dc)
    {
        if (dc.Error != null)
        {
            return;
        }
        XElement xmlNews = XElement.Parse(dc.Result);
        listBox1.ItemsSource = from item in xmlNews.Descendants("parent").Elements("sub")
                               select new ForecastItem
                               {
                                   a = item.Element("node").Value,
                                   b = item.Element("title").Value,                                       
                               };
    }

您从这里开始所做的就是将数据绑定到您的 XAML 数据模板

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