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Many WPF examples use CollectionViewSource as DataSource for DataBinding. It provides sorting and other useful functions. My question is, shouldn’t this be done in Database? I mean in SQL? I bet it’s 10times quicker. Isn’t CollectionViewSource too slow?
sometimes you may not want additional roundtrips to a database especially if you want fast response times when grouping/sorting.
Imagine a incremental search where non-fitting items get invisible while you type.
In addition, your datasource may not always be a database. imagine XML, runtime objects, data from a webservice, etc…