Geek asks and answers

Asynchronous execution of a command with user confirmation

I need to perform an async delete operation with user confirmation. Something like that:

public ReactiveAsyncCommand DeleteCommand { get; protected set; }
...
DeleteCommand = new ReactiveAsyncCommand();
DeleteCommand.RegisterAsyncAction(DeleteEntity);

...

private void DeleteEntity(object obj)
{
    if (MessageBox.Show("Do you really want to delete this entity?", "Confirm", MessageBoxButton.YesNo) == MessageBoxResult.Yes)
    {
        //some delete operations
    }
}

The problem is that the MessageBox will execute asynchronously. What is the best pattern in ReactiveUI to ask the user synchronously and then execute the method asynchronously?

+5
source share
1 answer

The easiest way to do this is to simply use two commands:

public ReactiveCommand DeleteCommand { get; protected set; }
private ReactiveAsyncCommand ExecuteDelete { get; protected set; }

/*
 * In the Constructor
 */

ExecuteDelete = new ReactiveAsyncCommand();
ExecuteDelete.RegisterAsyncAction(() => /* Do the delete */);

DeleteCommand = new ReactiveCommand(ExecuteDelete.CanExecuteObservable);
DeleteCommand
    .Where(_ => MessageBox.Show("Delete?") == MessageBoxResult.Yes)
    .InvokeCommand(ExecuteDelete);
+6
source

More articles:


All Articles