canExecute AsyncRelayCommand

[Scharps]

Hello,

When using an AsyncRelayCommand, how can I get the canExecute function to be checked immediately after the command is fired so that the command cannot be fired again until the command has finished executing?

Thanks!

[ozanbora]

I was just checking and saw your question. Couldn't resist to answer :)

Define a CanExecute property in your viewModel, and bind it to the userControl's enabled/disabled property, so that you can block user to spam commands. Moreover, you can define an IsBusy property in your viewModel property to indicate the command is running, so that user can see that the command is already running. Again bind IsBusy property to your view to display a busy indicator.

[Sergio0694]

This is supported out of the box with the new allowConcurrentExecutions parameter (#30).
Set that to false when creating a command, and concurrent operations will be skipped.
The CanExecute logic will also reflect this 🙂