windows phone 访问google天气预报

/*
pivot.xaml.cs
*/
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;
using Microsoft.Phone.Controls;
using System.IO;
using HtmlExtractor;
using System.Xml.Linq;

namespace IMove
{
    public partial class PivotPage1 : PhoneApplicationPage
    {
        private static String cityName = "Beijing"; 

        public PivotPage1()
        {
            InitializeComponent();

            LoadWeatherInformation();
        }

        private void LoadWeatherInformation()
        {
            OnlineUpdate();
        }

        private void OnlineUpdate()
        {
            UriBuilder uri = new UriBuilder("http://www.google.com/ig/api");
            uri.Query = "weather=" + cityName+ "&hl=zh-cn";// 如果不加&后面的话，返回的是英文的页面
　　　　　　　　
　　　　　　　　
　　　　　　　　//然后是用HttpWebRequest访问google api
            HttpWebRequest forecastRequest = (HttpWebRequest)WebRequest.Create(uri.Uri);
            forecastRequest.BeginGetResponse(new AsyncCallback(ForecastResponseCallback), forecastRequest);

        }

        private void ForecastResponseCallback(IAsyncResult asynchronousResult) {

            HttpWebRequest webRequest = (HttpWebRequest)asynchronousResult.AsyncState;
            HttpWebResponse webResponse = (HttpWebResponse)webRequest.EndGetResponse(asynchronousResult);
            Stream streamResponse = webResponse.GetResponseStream();
            StreamReader streamReader = new StreamReader(streamResponse,new Gb2312Encoding());//注意gb2312在windows phone里面目前没有，需要自己加入两个文件

            String content = streamReader.ReadToEnd();



            LinkedList<WeatherInfoUnit> weatherList = SplitWeatherInfo(content.Replace('\0',' ').Trim());//末尾出现很多'\0'，导致xml解析失败

            Dispatcher.BeginInvoke(() => UpdateWeatherText(weatherList));

            streamReader.Close();
            streamResponse.Close();
            webResponse.Close();
        }

        private void UpdateWeatherText(LinkedList<WeatherInfoUnit> weatherList)
        {

            WeatherInfoUnit curWeather = weatherList.ElementAt(0);
          
            runHumidity.Text = curWeather.Humidity;
            runTemperature.Text = curWeather.Low ;
            runWeather.Text = curWeather.Condition;

            WeatherInfoUnit curWeather1 = weatherList.ElementAt(1);
            textWeather1.Text = curWeather1.Date + "\n" + 
                 curWeather1.Low + " / " + curWeather1.High + " ℃\n" +
                curWeather1.Condition + "\n" ;

            WeatherInfoUnit curWeather2 = weatherList.ElementAt(2);
            textWeather2.Text = curWeather2.Date + "\n" +
                 curWeather2.Low + " / " + curWeather2.High + " ℃\n" +
                curWeather2.Condition + "\n";

            WeatherInfoUnit curWeather3 = weatherList.ElementAt(3);
            textWeather3.Text = curWeather3.Date + "\n" +
                 curWeather3.Low + " / " + curWeather3.High + " ℃\n" +
                curWeather3.Condition + "\n";
            
        }

        private LinkedList<WeatherInfoUnit> SplitWeatherInfo(String content)
        {
            LinkedList<WeatherInfoUnit> weatherList = new LinkedList<WeatherInfoUnit>();

            XElement xmlWeather = XElement.Parse(content);

            // extract current weather
            XElement currentConditions = xmlWeather.Descendants("current_conditions").First();
            WeatherInfoUnit curWeather = new WeatherInfoUnit();
            curWeather.Condition =(String) currentConditions.Element("condition").Attribute("data");
            curWeather.Low = (String)currentConditions.Element("temp_c").Attribute("data");
            curWeather.High = (String)currentConditions.Element("temp_c").Attribute("data");
            curWeather.Icon = (String)currentConditions.Element("icon").Attribute("data");
            String stringHumidity =(String)currentConditions.Element("humidity").Attribute("data");
            String stringHumidityPrix = "湿度：";
            curWeather.Humidity = stringHumidity.Substring(stringHumidityPrix.Length);
            curWeather.Date = "今天";
            weatherList.AddLast(curWeather);

            foreach (XElement element in xmlWeather.Descendants("forecast_conditions")) {
                curWeather = new WeatherInfoUnit();
                curWeather.Condition = (String)element.Element("condition").Attribute("data");
                curWeather.Low = (String)element.Element("low").Attribute("data");
                curWeather.High = (String)element.Element("high").Attribute("data");
                curWeather.Icon = (String)element.Element("icon").Attribute("data");              
                curWeather.Date = (String)element.Element("day_of_week").Attribute("data");
                weatherList.AddLast(curWeather);
            }


            return weatherList;
        }
    }
}

　

很简单的从google api 抓取xml数据做成的天气预报
设计httpwebrequest请求和xml解析
windows phone 的c# 与.net 有一些不同，多了很多限制，比如支持的Encoding很有限，连gb2312都没有。
附近有两个jpg文件，下载后把后缀换回.cs 加入工程中

　

pivot.xaml

<phone:PhoneApplicationPage 
    x:Class="IMove.PivotPage1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait"  Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <!--Pivot Control-->
        <controls:Pivot Title="I Move , So happy!">
            <!--Pivot item one-->
            <controls:PivotItem Header="主页">
                <Grid>                   
                     
                    <Canvas>
                        <TextBlock
                        TextWrapping="Wrap"
                        Style="{StaticResource PhoneTextLargeStyle}">
                        <Run x:Name="WelcomeTimeMark" >早上好，</Run>

                        </TextBlock>
                        
                        <TextBlock x:Name="WeatherInfo" Canvas.Left="30" Canvas.Top="69" Height="134" Width="206">
                          <Run>
                                当前天气
                          </Run>
                            <Run x:Name="runWeather">
                                
                            </Run>
                            <LineBreak/>
                            <Run>
                                气温
                            </Run>
                            <Run x:Name="runTemperature">
                                  _ _
                            </Run>
                            <Run>
                                ℃
                            </Run>
                            <LineBreak/>
                            <Run>
                                湿度：
                            </Run>
                            <Run x:Name="runHumidity">
                                
                            </Run>
                            

                         </TextBlock>
                        <Image x:Name="WeatherImg" Canvas.Left="302" Canvas.Top="76" Height="116" Width="127">
                            
                        </Image>
                        <TextBlock Canvas.Left="26" Canvas.Top="220" Height="96" Name="textWeather1" Text="Loading" Width="110" />
                        <TextBlock Canvas.Left="171" Canvas.Top="220" Height="96" Name="textWeather2" Text="Loading" Width="110" />
                        <TextBlock Canvas.Left="322" Canvas.Top="220" Height="96" Name="textWeather3" Text="Loading" Width="110" />
                    </Canvas>
                </Grid>
            </controls:PivotItem>

            <!--Pivot item two-->
            <controls:PivotItem Header="item2">
                <Grid/>
            </controls:PivotItem>

            <!--Pivot item three.-->
            <controls:PivotItem Header="item3">
                <Grid/>
            </controls:PivotItem>

        </controls:Pivot>
    </Grid>

    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton x:Name="appbar_button1" IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton x:Name="appbar_button2" IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem x:Name="menuItem1" Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem x:Name="menuItem2" Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

两个Encoding文件：