Dictionary_MyRule.xaml

<ResourceDictionary xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:local="clr-namespace:FLY.ControlLibrary.Rules"
                    >
    <local:FileNameRule x:Key="fnrule"/>
</ResourceDictionary>