I try use ARFilter choose all uUserWidget, but I got nothing, who can i do that?

Development Programming & Scripting C++
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1 
FARFilter ARFilter;
	ARFilter.bRecursiveClasses = true;
	ARFilter.ClassNames.Add(UUserWidget::StaticClass()->GetFName());
	int32 UINum = 0;
	TSet<FAssetData> MySet;
	IAssetRegistry::Get()->EnumerateAssets(ARFilter, [&](const FAssetData& AssetData)
	{
		MySet.Add(AssetData);
		return true;
	});
2

Try wth UWidgetBlueprint::StaticClass()