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
本实例采用VS2010+Silverlight 4.0编写。如需源码请点击 SLShowVideo.zip 下载。期待Silverlight 5 beta的到来。下面我们看实例的效果图:
本文转自程兴亮 51CTO博客,原文链接:http://blog.51cto.com/chengxingliang/822567