Is there a way to implement Caliburn-like co-routines in VB.NET since there's no yield keyword
- by Miroslav Popovic
Note that I'm aware of other yield in vb.net questions here on SO.
I'm playing around with Caliburn lately. Bunch of great stuff there, including co-routines implementation.
Most of the work I'm doing is C# based, but now I'm also creating an architecture guideline for a VB.NET only shop, based on Rob's small MVVM framework.
Everything looks very well except using co-routines from VB. Since VB 10 is used, we can try something like Bill McCarthy's suggestion:
Public Function Lines(ByVal rdr as TextReader) As IEnumerable(Of String)
Return New GenericIterator(Of String)
(Function(ByRef nextItem As String) As Boolean
nextItem = rdr.ReadLine
Return nextItem IsNot Nothing
End Function)
End Function
I'm just failing to comprehend how a little more complex co-routine method like the one below (taken from Rob's GameLibrary) could be written in VB:
public IEnumerable<IResult> ExecuteSearch()
{
var search = new SearchGames
{
SearchText = SearchText
}.AsResult();
yield return Show.Busy();
yield return search;
var resultCount = search.Response.Count();
if (resultCount == 0)
SearchResults = _noResults.WithTitle(SearchText);
else if (resultCount == 1 && search.Response.First().Title == SearchText)
{
var getGame = new GetGame
{
Id = search.Response.First().Id
}.AsResult();
yield return getGame;
yield return Show.Screen<ExploreGameViewModel>()
.Configured(x => x.WithGame(getGame.Response));
}
else SearchResults = _results.With(search.Response);
yield return Show.NotBusy();
}
Any idea how to achieve that, or any thoughts on using Caliburn co-routines in VB?
