createAsync1<TParam> method
Creates a RxCommand for an asynchronous handler function with one parameter and no return type
action: handler function
canExecute : observable that can be used to enable/disable the command based on some other state change
if omitted the command can be executed always except it's already executing
isExecuting will issue a bool value on each state change. Even if you
subscribe to a newly created command it will issue false
For the Observable<CommandResult> that RxCommand implement this normally doesn't make sense
if you want to get an initial Result with data==null, error==null, isExceuting==false pass
emitInitialCommandResult=true.
By default the results Observable and the RxCommand itself behave like a PublishSubject. If you want that it acts like
a BehaviourSubject, meaning every new listener gets the last received value, you can set emitsLastValueToNewSubscriptions = true.
Implementation
static RxCommand<TParam, void> createAsync1<TParam>(AsyncAction1<TParam> action,
{Observable<bool> canExecute,
bool emitInitialCommandResult = false,
bool emitsLastValueToNewSubscriptions = false}) {
return new RxCommandAsync<TParam, void>((x) async {
await action(x);
return null;
}, canExecute, emitInitialCommandResult, false, emitsLastValueToNewSubscriptions,null);
}