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RichTextBlock.SelectionChanged 이벤트

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// Register
event_token SelectionChanged(RoutedEventHandler const& handler) const;

// Revoke with event_token
void SelectionChanged(event_token const* cookie) const;

// Revoke with event_revoker
RichTextBlock::SelectionChanged_revoker SelectionChanged(auto_revoke_t, RoutedEventHandler const& handler) const;
public event RoutedEventHandler SelectionChanged;
function onSelectionChanged(eventArgs) { /* Your code */ }
richTextBlock.addEventListener("selectionchanged", onSelectionChanged);
richTextBlock.removeEventListener("selectionchanged", onSelectionChanged);
- or -
richTextBlock.onselectionchanged = onSelectionChanged;
Public Custom Event SelectionChanged As RoutedEventHandler 
<RichTextBlock SelectionChanged="eventhandler"/>

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