public bool CanExecute(object parameter = null)
{
try
{
return(canExecute != null?canExecute() : executingCount == 0);
}
catch (Exception ex)
{
XLog.Trace(ex);
return(true);
}
}
public async void Execute(object parameter = null)
{
bool couldExecuteBeforeExecute = CanExecute();
if (!couldExecuteBeforeExecute)
{
return;
}
Interlocked.Increment(ref executingCount);
bool couldExecuteDuringExecute = CanExecute();
if (couldExecuteDuringExecute != couldExecuteBeforeExecute)
{
RaiseCanExecuteChanged();
}
try
{
if (execute != null)
{
execute();
}
else
{
await asyncExecute();
}
}
catch (Exception ex)
{
XLog.Trace(ex);
}
finally
{
Interlocked.Decrement(ref executingCount);
bool couldExecuteAfterExecute = CanExecute();
if (couldExecuteAfterExecute != couldExecuteDuringExecute)
{
RaiseCanExecuteChanged();
}
}
}