Iterator equivalent in .net 4.0

Question

Hi,

Anyone knows about the Iterator equivalent in .net 4.0?

I have a ( Iterator Function / Yield ) code sample which will not compile in my .NET fw 4.0 project.

Need to change it to work in vs.net 2010 .net 4.0, any idea how to proceed?

Thanks.

Private Shared Iterator Function AllNodes(ByVal nodes As NodeCollection) As IEnumerable
	For i As Integer = 0 To nodes.Count - 1
		Dim node As Node = nodes(i)
		Yield node
		If node.Nodes.Count > 0 Then
			For Each item As Node In AllNodes(node.Nodes)
				Yield item
			Next item
		End If
	Next i
End Function

Answer 1

See https://visualstudiomagazine.com/articles/2011/11/10/understanding-iterators-part-1.aspx

Answer 2

there is no support yield generators in that version of vb. (it mostly compiler sugar).

the easiest fix would be to convert the function to return an array or collection of nodes. instead of yield, add the node to the collection.

Answer 3

Hi @Alec Pointer ,

According to Iterators (Visual Basic), Iterators were introduced in Visual Basic in Visual Studio 2012.

It is recommended that you turn to newer versions of Visual Studio.

Or you might consider putting all Nodes into an array.

Best Regards. 

Jiachen Li 

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