What is actually happening in VirtualizingStackPanel.VirtualizationMode = Recycling/Standard.?
When VirtualizationMode is set to Recycling, the VirtualizingStackPanel will reuse item containers instead of having to create a new one.
If we start out with this
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| Container 1 | Data 1 |
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| Container 2 | Data 2 |
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| Container 3 | Data 3 |
And scroll one position down, so Data 1 is scrolled out of view and Data 4 is scrolled into view then Recyling will take the item container for Data 1 and reuse it for Data 4.
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| Container 2 | Data 2 |
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| Container 3 | Data 3 |
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| Container 1 | Data 4 |
I've had some problems with this when using attached properties for the Item container, e.g Green background if I have entered edit mode for Container 1. Scrolling down and Data 4 will also have Green background since the Attached Property was still set.
When VirtualizationMode is set to Standard, the VirtualizingStackPanel will create and discard item containers instead of reusing them.
来源：https://stackoverflow.com/questions/4300964/what-is-the-actual-difference-between-recycling-standard-of-virtualizationmode-p