由于....

Public MasterList as IEnumerable(Of MasterItem)
Public Class MasterItem(Of T) 
    Public SubItems as IEnumerable(Of T)
End Class

我想一个单一的IEnumerable（Of T）中，将遍历所有MasterItems的MasterList所有子项

I would like a single IEnumerable(Of T) which will iterate through all SubItems of all MasterItems in MasterList

我想认为有一个LINQ设施要做到这一点，或者一个扩展方法，我俯瞰。我需要一个在VB9（2008年）的作品，因此不使用屈服机制。

I would like to think that there is a Linq facility to do this, or an extension method I am overlooking. I need a mechanism that works in VB9 (2008) and hence does not use Yield.

推荐答案

您是否正在寻找的SelectMany（）？

Are you looking for SelectMany()?

MasterList.SelectMany(master => master.SubItems)

对不起，C＃，不知道VB。

Sorry for C#, don't know VB.