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`[AsyncDelegateCommand]`

Use for Task-based async methods when you need Prism-style options:

EnableParallelExecution
CancelAfter
Catch (exception handler — PSG2001 / PSG2002 if invalid)
ObservesCanExecute (or pair with [ObservesProperty] on [DelegateCommand])
CancellationTokenSourceFactory (where supported)

csharp

[AsyncDelegateCommand(EnableParallelExecution = true)]
private async Task FetchAsync() { }

[AsyncDelegateCommand(CanExecute = nameof(CanSave), Catch = nameof(HandleError))]
private async Task SaveAsync() { }

Prism 8 vs 9

Prism 9+: AsyncDelegateCommand ships with Prism.
Prism.Core 8.1.97: install MvvmAIO.Prism.Bcl.Commands so the symbol exists; otherwise PSG3002.