CODEWITHSUNDEEP
c#wpfperformanceresizescrollviewer
Seth Carnegie
Seth Carnegie

Reputation: 75150

Resizing a ScrollViewer containing many items is very slow

I have a ScrollViewer containing a StackPanel that is filled with over 1000 items that each contain a bunch of other items. It performs like a champ at idle or when I actually scroll it. However, when I resize it or anything that causes it to resize (e.g. the containing top-level window), it gets really slow, freezes, and takes about 30 seconds to unfreeze and be resized.

I have discovered that setting VerticalScrollBarVisibility to ScrollBarVisibility.Hidden or ScrollBarVisibility.Disabled before I resize makes it perfectly smooth. However, enabling and disabling ScrollBarVisibility takes around 5 seconds each, which, while better than waiting 30 seconds to resize, is still too long a wait.

What can I do to help gain performance in resizing a StackPanel in a ScrollPanel that contains many items?

Upvotes: 3

Views: 663

Answers (1)

JMarsch
JMarsch

Reputation: 21751

You might consider switching to a listbox (I know, sounds weird, but hear me out). The listbox uses a virtualizing stackpanel -- it manages how many controls are actually in memory, creating them as you scroll.

You can use a datatemplate to make each listbox item look like anything that you want.

(note, this is all assuming that you are displaying some sort of repeating data).

Upvotes: 1

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