Schedule Enable Options. with IfModified Since(DateTime ifModifiedSince) 方法
Set a timestamp indicating the last modified time of the resource known to the client. The operation will be performed only if the resource on the service has been modified since the specified time.
public JobScheduleEnableOptions withIfModifiedSince(DateTime ifModifiedSince)
the ifModifiedSince value to set
the JobScheduleEnableOptions object itself.