PCL2-NewsHomepage/Library/Customs/Homepage/jumpCard.xaml

<local:MyCard Title="更多页面..." Margin="0,0,0,20">
    <StackPanel Margin="25,40,23,15">
    <Grid>
      <Grid.ColumnDefinitions>
        <ColumnDefinition Width="1*"/>
        <ColumnDefinition Width="100"/> 
      </Grid.ColumnDefinitions>
      <local:MyComboBox x:Name="jumpbox" Height="30" SelectedIndex="0">
        <local:MyComboBoxItem Content="1.17存档"/>
        <local:MyComboBoxItem Content="1.18存档"/>
        <local:MyComboBoxItem Content="1.19存档"/>
        <local:MyComboBoxItem Content="1.20存档"/>
      </local:MyComboBox>
        <local:MyButton HorizontalAlignment="Center" Width="80"
            Grid.Column="1" Text="打开→" EventType="打开帮助" 
            EventData="{Binding Path=Text,ElementName=jumpbox,StringFormat=https://test.bugjump.net/news/{0}.json}"/>
    </Grid>
    </StackPanel>
</local:MyCard>