已不再支援此瀏覽器。
請升級至 Microsoft Edge，以利用最新功能、安全性更新和技術支援。
Important
Some information relates to prerelease product that may be substantially modified before it’s released. Microsoft makes no warranties, express or implied, with respect to the information provided here.
public: System::Object ^ IfNa(System::Object ^ Arg1, System::Object ^ Arg2);
public object IfNa (object Arg1, object Arg2);
Public Function IfNa (Arg1 As Object, Arg2 As Object) As Object
此頁面對您有幫助嗎？