C#中的关键字Upgradable什么意思？
最近在看SharePoint的从元数据时候发现，之下的语句？
UpgradableAttribute设什么属性没见过
忘高手可以帮忙？
namespace Microsoft.SharePoint
{
[Upgradable]
public class SPSite : IDisposable, Microsoft.SharePoint.ISPWorkItemHost
右键转到定义呢?
这什么特性？
http://msdn.microsoft.com/zh-cn/library/microsoft.sharepoint.upgrade.upgradableattribute.upgradableattribute.aspx
C# code:
Represents a class that can participate in the Windows SharePoint Services extensible upgrade infrastructure.
The following tables list the members exposed by the UpgradableAttribute type.
Public Constructors
Name Description
UpgradableAttribute Initializes a new instance of the UpgradableAttribute class.
Top
Public Properties
Name Description
TypeId (inherited from Attribute)
Top
Public Methods (see also Protected Methods )
Name Description
Equals Overloaded. (inherited from Attribute)
GetCustomAttribute Overloaded. (inherited from Attribute)
GetCustomAttributes Overloaded. (inherited from Attribute)
GetHashCode (inherited from Attribute)
GetType (inherited from Object)
IsDefaultAttribute (inherited from Attribute)
IsDefined Overloaded. (inherited from Attribute)
Match (
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