在silverlight实际项目中时常会需要播放视频和打印文档,在本节中我们将制作一个最简单的播放视频和打印文档的实例。
一、播放WMV视频
首先我们创建一个Silverlight应用程序SLShowVideo,然后放一个示例Wmv视频在SLShowVideo.web项目的根目录下面。
然后我们在Xaml文档中放入一个MediaElement控件,并写入以下代码:
<MediaElement Height="377" HorizontalAlignment="Left" Margin="8,31,0,0" Name="showVideo" VerticalAlignment="Top" Width="583" /> <Button Content="播 放" Height="28" HorizontalAlignment="Left" Margin="194,428,0,0" Name="button1" VerticalAlignment="Top" Width="99" Click="button1_Click_1" /> <Button Content="暂 停" Height="28" HorizontalAlignment="Left" Margin="333,428,0,0" Name="button3" VerticalAlignment="Top" Width="99" Click="button3_Click" /> <Button Content="停 止" Height="28" HorizontalAlignment="Left" Margin="468,428,0,0" Name="button2" VerticalAlignment="Top" Width="99" Click="button2_Click" /> <Button Content="加载视频" Height="28" HorizontalAlignment="Left" Margin="57,428,0,0" Name="button4" VerticalAlignment="Top" Width="99" Click="button1_Click"/>
最后我们写入以下代码加载视频并且控制视频的播放:
#region 播放视频 private void button1_Click(object sender, RoutedEventArgs e) { //加载视频 this.showVideo.Source = new Uri(GetURL()+"/sampleVideo.wmv"); } /// <summary> /// 获取当前网站的Url前缀 /// </summary> /// <returns></returns> public static string GetURL() { ScriptObject location = (HtmlPage.Window.GetProperty("location") as ScriptObject); object r = location.GetProperty("href"); string URL = r.ToString().Substring(0, r.ToString().LastIndexOf('/')); //截取到当前SILVERLIGHT程序存放网络URL的前缀 return URL; } private void button3_Click(object sender, RoutedEventArgs e) { //暂停 this.showVideo.Pause(); } private void button2_Click(object sender, RoutedEventArgs e) { //停止 this.showVideo.Stop(); } private void button1_Click_1(object sender, RoutedEventArgs e) { //播放 this.showVideo.Play(); } #endregion
二、打印文档
首先我们看XAML文档。添加一个Canvas元素,元素内的所有内容就是我们即将要打印(当然你也可以设置打印Grid等元素的内容)。
<Canvas Height="376" HorizontalAlignment="Left" Margin="611,32,0,0" Name="canvas1" VerticalAlignment="Top" Width="369" > <sdk:Label Width="85" Canvas.Left="9" Content="第一个打印程序" Canvas.Top="27" /> <sdk:Label Canvas.Left="11" Canvas.Top="60" Height="16" Content="第二个打印程序" Name="label1" Width="86" /> </Canvas> <Button Content="打印" Height="34" HorizontalAlignment="Left" Margin="747,426,0,0" Name="btnPrint" VerticalAlignment="Top" Width="110" Click="btnPrint_Click" />
在Button事件处理程序中我们添加一下代码打印Canvas元素。
#region 打印文档 PrintDocument print; private void btnPrint_Click(object sender, RoutedEventArgs e) { print = new PrintDocument(); //添加一个打印页面事件以设置需要打印的控件 print.PrintPage += new EventHandler<PrintPageEventArgs>(print_PrintPage); print.Print("canvas1"); } void print_PrintPage(object sender, PrintPageEventArgs e) { //设置打印this.canvas1的所有内容 e.PageVisual = this.canvas1; } #endregion