Livetを使ったダイアログ表示とVM連携

livet-openfiledlg.xaml

<!--
xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"
xmlns:ei="http://schemas.microsoft.com/expression/2010/interactions"
xmlns:l="http://schemas.livet-mvvm.net/2011/wpf"
-->

<Button Content="開く" IsEnabled="{Binding OpenCommand.CanExecute}>
  <i:Interaction.Triggers>
    <i:EventTrigger EventName="Click">
      <l:OpenFileDialogInteractionMessageAction>
        <l:DirectInteractionMessage CallbackCommand="{Binding OpenCommand, Mode=OneWay}">
          <l:OpeningFileSelectionMessage Filter="すべてのファイル(*.*)|*.*" Title="ファイルを開く" MultiSelect="True"/>
        </l:DirectInteractionMessage>
      </l:OpenFileDialogInteractionMessageAction>
    </i:EventTrigger>
  </i:Interaction.Triggers>
</Button>