createAsync method

RxCommand<Null, Null> createAsync (AsyncAction action, { Observable<bool> canExecute, bool emitInitialCommandResult: false })

Creates a RxCommand for an asynchronous handler function with no parameter and no return type action: handler function canExecute : observable that can bve used to enable/diable 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.

Implementation

/// [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].
 static RxCommand<Null, Null> createAsync(AsyncAction action,{Observable<bool> canExecute, bool emitInitialCommandResult = false})
{
    return new RxCommandAsync<Null,Null>((_)  { action(); return  null;},canExecute,emitInitialCommandResult);
}