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 " />
#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：
本文转自程兴亮博客园博客，原文链接：http://www.cnblogs.com/chengxingliang/archive/2011/04/13/2013877.html，如需转载请自行联系原作者
