IUpgradable2 接口
补充一个附加属性，指示向后兼容性的IUpgradable接口。
命名空间： Microsoft.SharePoint.Administration
程序集： Microsoft.SharePoint（位于 Microsoft.SharePoint.dll 中）
语法
声明
<SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel := True)> _
<SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel := True)> _
Public Interface IUpgradable2
用法
Dim instance As IUpgradable2
[SharePointPermissionAttribute(SecurityAction.LinkDemand, ObjectModel = true)]
[SharePointPermissionAttribute(SecurityAction.InheritanceDemand, ObjectModel = true)]
public interface IUpgradable2