AnyToVisibilityConverter
当值不为null时,将值转换为Visibility.Visible,否则转换为Visibility.Collapsed。
例:ChangeSourceDialog.xaml
<InfoBar Severity="Error" IsOpen="True" Message="{x:Bind WarningText, Mode=OneWay}"
Visibility="{x:Bind WarningText, Mode=OneWay, Converter={StaticResource AnyToVisibility}}"/>
...
<converter:AnyToVisibilityConverter x:Key="AnyToVisibility" />