Meaning of the '+' in PowerShell new-object declarations

Question

I'm wondering how to know when to use the '+' in PowerShell object declarations.

Why, for example, is it: $searchFilterC = new-object Microsoft.Exchange.WebServices.Data.SearchFilter+SearchFilterCollection

and not: $searchFilterC = new-object Microsoft.Exchange.WebServices.Data.SearchFilter.SearchFilterCollection

Thanks!

Answer 1

“ +”表示嵌套类型，有关更多信息，请参见此处 。