public Task <BuildResult> Clean(ProgressMonitor monitor, ConfigurationSelector configuration, OperationContext operationContext = null)
{
var slnConf = ParentSolution?.GetConfiguration(configuration);
if (slnConf == null)
{
return(Task.FromResult(new BuildResult()));
}
//don't collect dependencies, CleanItems will do it
var collected = new HashSet <SolutionItem> ();
CollectBuildableEntries(collected, configuration, slnConf, false);
return(ParentSolution.CleanItems(
monitor, configuration, collected, operationContext,
IsRoot ? GettextCatalog.GetString("Cleaning solution {0} ({1})", Name, configuration.ToString()) : null
));
}