'宣言 Protected Overrides Function IsDestinationValueValid( _ ByVal direction As ConversionDirection, _ ByVal destinationVal As Object, _ ByVal owner As EmbeddableEditorOwnerBase, _ ByVal ownerContext As Object, _ ByRef message As String _ ) As Boolean
protected override bool IsDestinationValueValid( ConversionDirection direction, object destinationVal, EmbeddableEditorOwnerBase owner, object ownerContext, out string message )