WindowsPhone网络编程之Client

System.Net通信方式

1 HttpWebRequest使用基于代理的异步编程模型，而WebClient使用的是基于事件的异步编程模型，更容易使用，并且需要的代码量通常比较上。

2 HttpWebRequest支持HTTP协议的较大子集，这使其更适合一些高级方案，因为它提供对服务请求的更强控制，

3 在HTTP响应返回时，引发的WebClient回调实在用户界面ui线程中调用，因此可用于更新ui元素属性，而HttpWebRequest不是，因此回调中需要额外代码处理ui

WebClient类

由于WebClient请求都是异步的，使用的是基于异步事件编程模型，大部分交互操作都是依靠时间处理来完成，

DownloadProcessChanged

DownloadStringChanged

OpenReadCompleted

OpenWriteCompleted

UploadProcessChanged

UploadStringChanged

WriteStreamClosed

<phone:PhoneApplicationPage 
    x:Class="快递100.MainPage"
    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: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">
        <!--<Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>-->

        <!--TitlePanel contains the name of the application and page title-->
        <!--<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>-->

        <!--ContentPanel - place additional content here-->
        <!--<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"></Grid>-->

        <TextBlock Text="快递查询" FontSize="28" HorizontalAlignment="Center"></TextBlock>
        <Button Content="查 询" Height="72" HorizontalAlignment="Left" Margin="150,155,0,0" Name="btnSearch" VerticalAlignment="Top" Width="160" Click="btnSearch_Click" />
        <TextBox Height="71" HorizontalAlignment="Right" Margin="0,63,27,0" Name="textBox1" Text="" InputScope="TelephoneNumber" VerticalAlignment="Top" Width="303" />
        <TextBlock Height="30" HorizontalAlignment="Left" Margin="61,84,0,0" Name="textBlock1" Text="快递单号：" VerticalAlignment="Top" />
        <TextBlock Height="200" HorizontalAlignment="Left" Margin="12,327,0,0" Name="txtBlockNews" Text="" VerticalAlignment="Top" Width="468" />
    </Grid>
 
    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Xml.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 System.IO.IsolatedStorage;
using System.Text;
using System.Xml;


namespace 快递100
{
    public partial class MainPage : PhoneApplicationPage
    {
        // Constructor
        public MainPage()
        {
            InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
           
        }

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            //throw new NotImplementedException(); 
            NavigationService.Navigate(new Uri("/快递100;component/Page1.xaml", UriKind.Relative));
        }
       // IsolatedStorageFile isolatedStroageFile = null;
        private void btnSearch_Click(object sender, RoutedEventArgs e)
        {

            string uri = @"http://api.kuaidi100.com/apione?com=yuantong&nu=" + this.textBox1.Text + "&show=1 ";


            WebClient scDownloadString = new WebClient();
          
            scDownloadString.DownloadStringCompleted += new DownloadStringCompletedEventHandler(scDownloadString_DownloadStringCompleted);
            scDownloadString.DownloadStringAsync(new Uri(uri));

            
        }

        void scDownloadString_DownloadStringCompleted(object sender, DownloadStringCompletedEventArgs e)
        {
            //throw new NotImplementedException();
            string returnValue = e.Result ;
            //this is source demo         returnValue    "{\"message\":\"ok\",\"status\":\"1\",\"link\":\"http://kuaidi100.com/chaxun?com=yuantong&nu=1780371398\",\"state\":\"3\",\"data\":[{\"time\":\"2012-03-19 15:02:42\",\"context\":\"河南省南阳市白河南/PDA正常签收扫描/签收人:孟星星 \"}]}"    string
            //source demo2 e.Result = "<xml><message>ok</message><status>1</status><link>http://kuaidi100.com/chaxun?com=yuantong&amp;nu=1780371398</link><state>3</state><data><time>2012-03-19 15:02:42</time><context>河南省南阳市白河南/PDA正常签收扫描/签收人:孟星星 </context></data></xml>"
          

            Dictionary<string,string> dictionary = new Dictionary<string, string>();

            using (XmlReader xmlReader=XmlReader.Create(new StringReader(returnValue)))
            {
                while (xmlReader.Read())
                {
                    //if this is the first node  and name ==xml
                    if (xmlReader.IsStartElement()&&(xmlReader.LocalName=="xml"))
                    {
                        using (XmlReader itemReader=xmlReader.ReadSubtree())
                        {
                            while (itemReader.Read())
                            {
                                //如果找到一个节点就开始读取其中内容
                                if (itemReader.NodeType==XmlNodeType.Element)
                                {
                                    string nodeName = itemReader.Name;
                                    itemReader.Read();
                                    //提取内容
                                    if (itemReader.NodeType==XmlNodeType.Text)
                                    {
                                        switch (nodeName)
                                        {
                                            case "message":
                                                dictionary.Add("message",itemReader.Value);break;
                                            case "status":
                                                dictionary.Add("status", itemReader.Value);break;
                                            case "link":
                                                dictionary.Add("link", itemReader.Value); break;
                                            case "state":
                                                dictionary.Add("state", itemReader.Value); break;
                                            case "time":
                                                dictionary.Add("time", itemReader.Value); break;
                                            case "context":
                                                dictionary.Add("context", itemReader.Value); break;
                                            default:
                                                break;
                                        }
                                    }
                                }
                            }
                        }
                    }
                }

            }
            string str=null;
            dictionary.TryGetValue("context", out str);
            this.txtBlockNews.Text = str;

        }
    }


}

<phone:PhoneApplicationPage 
    x:Class="快递100.Page1"
    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:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    mc:Ignorable="d" d:DesignHeight="768" d:DesignWidth="480"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">
        <!--<Grid.RowDefinitions>
            <RowDefinition Height="Auto"/>
            <RowDefinition Height="*"/>
        </Grid.RowDefinitions>-->

        <!--TitlePanel contains the name of the application and page title-->
        <!--<StackPanel x:Name="TitlePanel" Grid.Row="0" Margin="12,17,0,28">
            <TextBlock x:Name="ApplicationTitle" Text="MY APPLICATION" Style="{StaticResource PhoneTextNormalStyle}"/>
            <TextBlock x:Name="PageTitle" Text="page name" Margin="9,-7,0,0" Style="{StaticResource PhoneTextTitle1Style}"/>
        </StackPanel>-->

        <!--ContentPanel - place additional content here-->
        <!--<Grid x:Name="ContentPanel" Grid.Row="1" Margin="12,0,12,0"></Grid>-->
        <Button Content="Button" Height="72" HorizontalAlignment="Left" Margin="144,64,0,0" Name="button1" VerticalAlignment="Top" Width="160" Click="button1_Click" />
        <Image Height="427" HorizontalAlignment="Left" Margin="0,142,0,0" Name="image1" Stretch="Fill" VerticalAlignment="Top" Width="480" />
        <TextBlock Height="30" HorizontalAlignment="Left" Margin="24,708,0,0" Name="textBlock1" Text="TextBlock" VerticalAlignment="Top" />
        <TextBlock Height="30" HorizontalAlignment="Left" Margin="178,708,0,0" Name="textBlock2" Text="TextBlock" VerticalAlignment="Top" />
        <TextBlock Height="30" HorizontalAlignment="Left" Margin="345,708,0,0" Name="textBlock3" Text="TextBlock" VerticalAlignment="Top" />
        <ProgressBar Height="28" HorizontalAlignment="Left" Margin="12,608,0,0" Name="progressBar1" VerticalAlignment="Top" Width="439" />
    </Grid>
 
    <!--Sample code showing usage of ApplicationBar-->
    <!--<phone:PhoneApplicationPage.ApplicationBar>
        <shell:ApplicationBar IsVisible="True" IsMenuEnabled="True">
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button1.png" Text="Button 1"/>
            <shell:ApplicationBarIconButton IconUri="/Images/appbar_button2.png" Text="Button 2"/>
            <shell:ApplicationBar.MenuItems>
                <shell:ApplicationBarMenuItem Text="MenuItem 1"/>
                <shell:ApplicationBarMenuItem Text="MenuItem 2"/>
            </shell:ApplicationBar.MenuItems>
        </shell:ApplicationBar>
    </phone:PhoneApplicationPage.ApplicationBar>-->

</phone:PhoneApplicationPage>

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;

namespace 快递100
{
    public partial class Page1 : PhoneApplicationPage
    {
        public Page1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, RoutedEventArgs e)
        {

            string uri = @"http://img9.zol.com.cn/dp_800/390/389112.jpg";
            WebClient wcDownloadStream = new WebClient();
            if(wcDownloadStream.IsBusy)
            {
                wcDownloadStream.CancelAsync();
               
            }
            wcDownloadStream.OpenReadCompleted += new OpenReadCompletedEventHandler(wcDownloadStream_OpenReadCompleted);
            wcDownloadStream.DownloadProgressChanged += new DownloadProgressChangedEventHandler(wcDownloadStream_DownloadProgressChanged);
            wcDownloadStream.OpenReadAsync(new Uri(uri));
        }

        void wcDownloadStream_DownloadProgressChanged(object sender, DownloadProgressChangedEventArgs e)
        {
            //throw new NotImplementedException();
            progressBar1.Value = e.ProgressPercentage;
            textBlock1.Text = e.ProgressPercentage.ToString() + "%";
            textBlock2.Text = e.BytesReceived.ToString();
            textBlock3.Text = e.TotalBytesToReceive.ToString();
        }

        void wcDownloadStream_OpenReadCompleted(object sender, OpenReadCompletedEventArgs e)
        {
           // throw new NotImplementedException();
            System.IO.Stream str = e.Result;
            System.Windows.Media.Imaging.BitmapImage imageSource = new System.Windows.Media.Imaging.BitmapImage();
            imageSource.SetSource(str);
            image1.Source = imageSource;
        }
    }
}