silverlight 生成二维码

MainPage.xaml

  <Grid x:Name="LayoutRoot" Background="White">
         <Border BorderThickness="" BorderBrush="Black" />
         <Grid ShowGridLines="True">
             <Grid.RowDefinitions>
                 <RowDefinition/>
                 <RowDefinition Height=""/>
                 <RowDefinition Height=""/>
                 <RowDefinition Height=""/>
             </Grid.RowDefinitions>
             <Grid.ColumnDefinitions>
                 <ColumnDefinition Width=""/>
                 <ColumnDefinition/>
             </Grid.ColumnDefinitions>
             <TextBlock Text="二维码" Grid.Column="" Grid.Row="" TextAlignment="Center" Margin="10,50" />
             <Image x:Name="imgCode" Grid.Column="" Grid.Row="" Margin=""/>
             <TextBlock Text="图片大小" Grid.Column="" Grid.Row="" Margin="" TextAlignment="Center" />
             <ComboBox x:Name="cmbSize" Grid.Column="" Grid.Row="" Width="" Height="" HorizontalAlignment="Right" Margin="0,10,100,10">
                 <ComboBoxItem Content="" IsSelected="True" />
                 <ComboBoxItem Content="" />
             </ComboBox>
             <TextBlock Text="二维码内容" Grid.Column="" Grid.Row="" TextAlignment="Center" Margin=""/>
             <TextBox x:Name="txtContent" Height="" Margin="" Grid.Column="" Grid.Row="" />
             <Button x:Name="btnAdd" Content="生成" Width=""  Grid.Row="" Grid.Column="" Click="btnAdd_Click" Margin=""/>
         </Grid>
     </Grid>

MainPage.xaml.cs

  public partial class MainPage : UserControl
     {
         StringBuilder sb = null;
         Uri uri = null;
         public MainPage()
         {
             InitializeComponent();
             sb = new StringBuilder();
         }
         private void btnAdd_Click(object sender, RoutedEventArgs e)
         {
             sb.Append("http://chart.apis.google.com/chart?cht=qr&chs=");
             sb.Append(((ComboBoxItem)cmbSize.SelectedItem).Content.ToString());
             sb.Append("x");
             sb.Append(((ComboBoxItem)cmbSize.SelectedItem).Content.ToString());
             sb.Append("&chl=");
             sb.Append(txtContent.Text);
             uri = new Uri(sb.ToString());
             imgCode.Source = new BitmapImage(uri);
             sb.Clear();
         }
     }