Winphone开发之下载+显示图片

来源：互联网发布：国际短信软件编辑：程序博客网时间：2024/06/04 21:58

要吐槽一下，WINPHONE的开发资料真的少的可怜（不过MSDN上面基本已经可以了，我说的是整个的开发氛围）。

下面这个代码做的只是下载一张图片然后在界面上面显示出来，功能非常简单，不过代码知其然不知其所以然，回来再自己看看。

下面是XAML代码：

<phone:PhoneApplicationPage    x:Class="PhoneApp2.MainPage"    Loaded="PhoneApplicationPage_Loaded"    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"    FontFamily="{StaticResource PhoneFontFamilyNormal}"    FontSize="{StaticResource PhoneFontSizeNormal}"    Foreground="{StaticResource PhoneForegroundBrush}"    SupportedOrientations="Portrait" Orientation="Portrait"    shell:SystemTray.IsVisible="True">    <!--LayoutRoot 是包含所有页面内容的根网格-->    <Grid  x:Name="LayoutRoot" Background="Transparent">        <Image Name="MyPic" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Stretch="None"/>    </Grid></phone:PhoneApplicationPage>

下面是CS文件：

using System;using System.Collections.Generic;using System.Linq;using System.Windows;using System.Windows.Controls;using System.Windows.Navigation;using Microsoft.Phone.Controls;using Microsoft.Phone.Shell;using PhoneApp2.Resources;using System.IO;using System.Diagnostics;using System.Windows.Media;using System.Windows.Media.Imaging;namespace PhoneApp2{    public partial class MainPage : PhoneApplicationPage    {        private const String URL_API = "http://www.ray-joy.com/UploadFiles/clubfiles/2013-06/2013063007350484904.jpg";        // 构造函数        public MainPage()        {            InitializeComponent();            // 用于本地化 ApplicationBar 的示例代码            //BuildLocalizedApplicationBar();        }        private void Download(String uri)        {            System.Net.WebClient client = new System.Net.WebClient();            client.OpenReadAsync(new Uri(uri));            client.OpenReadCompleted += new System.Net.OpenReadCompletedEventHandler(webclient_openReadCompleted);        }        private void webclient_openReadCompleted(object sender, System.Net.OpenReadCompletedEventArgs e)        {            using (Stream s = e.Result)            {                byte[] data = new byte[s.Length + 1];                s.Read(data , 0 , data.Length);                BitmapImage image = new BitmapImage();                MemoryStream ms = new MemoryStream(data);                image.SetSource(ms);                MyPic.Source = image;                      }        }        private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)        {            Download(URL_API);        }    }}

0 0