英文:
Iterator equivalent in .net 4.0
问题
这段代码使用了在较新版本的.NET框架中引入的Iterator和Yield功能，但在.NET 4.0中并不支持。需要将其改写为兼容.NET 4.0的代码。
在.NET 4.0中，您可以使用类似迭代器的方式，手动构建一个返回IEnumerable的函数。下面是代码示例：
Private Shared Function AllNodes(ByVal nodes As NodeCollection) As IEnumerable
Dim nodeList As New List(Of Node)()
For i As Integer = 0 To nodes.Count - 1
Dim node As Node = nodes(i)
nodeList.Add(node)
If node.Nodes.Count > 0 Then
For Each item As Node In AllNodes(node.Nodes)
nodeList.Add(item)
Next item
End If
Next i
Return nodeList
End Function
以上代码创建了一个List(Of Node)，并在遍历过程中手动添加节点，最后返回整个节点列表作为IEnumerable。
英文:
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.
My sample won't compile in .net 4.0
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
答案1
得分: 2
你至少需要 Visual Basic 11（来自 Visual Studio 2012）的编译器才能构建使用迭代器块的代码。据我所知，.Net 4.0 运行时本身支持这一点，但你需要更新的编译器/构建环境。
但是 Visual Studio 2010 现在非常老旧且完全不受支持。更新的版本是免费的，可以针对旧的运行时环境，所以抓住这个机会进行升级。
英文:
You need the compiler for at least Visual Basic 11 (from Visual Studio 2012) to build code using iterator blocks. IIRC, the .Net 4.0 runtime itself does support this, but you need the newer compiler/build environment.
But Visual Studio 2010 is very old now and completely unsupported. Later versions are free, and can target the older runtime, so take this as a good opportunity to upgrade.
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论