#### [Pf2e\.WPF](index.md 'index')
### [Pf2e\.WPF\.EntityViewer\.EntityViewStructure](Pf2e.WPF.EntityViewer.EntityViewStructure.md 'Pf2e\.WPF\.EntityViewer\.EntityViewStructure').[CollapseCommand](CollapseCommand.md 'Pf2e\.WPF\.EntityViewer\.EntityViewStructure\.CollapseCommand')

## CollapseCommand\.CanExecuteChanged Event

Событие, вызываемое при изменении возможности выполнения команды\.

```csharp
public event EventHandler? CanExecuteChanged;
```

Implements [CanExecuteChanged](https://learn.microsoft.com/en-us/dotnet/api/system.windows.input.icommand.canexecutechanged 'System\.Windows\.Input\.ICommand\.CanExecuteChanged')

#### Event Type
[System\.EventHandler](https://learn.microsoft.com/en-us/dotnet/api/system.eventhandler 'System\.EventHandler')