AppInstance.GetPreviousAppVersion 方法
Retrieves the version of the app that is being upgraded from during an upgrade.
命名空间： Microsoft.SharePoint.Client
程序集： Microsoft.SharePoint.Client.Silverlight（位于 Microsoft.SharePoint.Client.Silverlight.dll 中）; Microsoft.SharePoint.Client.Phone（位于 Microsoft.SharePoint.Client.Phone.dll 中） Microsoft.SharePoint.Client（位于 Microsoft.SharePoint.Client.dll 中）
语法
声明
Public Function GetPreviousAppVersion As App
用法
Dim instance As AppInstance
Dim returnValue As App
returnValue = instance.GetPreviousAppVersion()
public App GetPreviousAppVersion()
返回值
类型：Microsoft.SharePoint.Client.App
The version of the app being upgraded from. Otherwise, 空引用（无 在 Visual Basic 中）.