sl从程序集中读取xaml文件

 StreamResourceInfo sri = Application.GetResourceStream(new Uri("HowTo;component/Page.xaml", UriKind.Relative));
 StreamReader sr = new StreamReader(sri.Stream);
 txtReadxml.Text = sr.ReadToEnd();

<UserControl x:Class="HowTo.Page"
     xmlns="http://schemas.microsoft.com/client/2007" 
     xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
     Width="400" Height="300">
 <Grid x:Name="LayoutRoot" Background="White">
 <TextBlock x:Name="txtReadxml"></TextBlock>
 </Grid>
 </UserControl>