vb.net实现Vb中的Any变体类型

今天无意中发现可以替代VB中的Any 在API声明中可以使用<MarshalAs(UnmanagedType.AsAny)>

VB中声明的API

Declare Function SendMessage& Lib "user32" Alias "SendMessageA" (ByVal hwnd As Long, ByVal wMsg As Long, ByVal wParam As Long, lParam As Any)

在vb.net可以这样玩

Declare Function SendMessage Lib "user32" Alias "SendMessageA" (ByVal hwnd As Int32, ByVal wMsg As Int32, ByVal wParam As Int32, <MarshalAs(UnmanagedType.AsAny)> lParam As Object) As Int32