The best replacement for ienumerable is icollection.

The best alternatives to ienumerable are rated as following:
★★★★★  icollection
★★★★★  ienumerator
★★★★  list
★★★★  ilist
★★★★  iqueryable
★★  ienumerable t
★★  iqueryable linq
★★  readonlycollection
★★  enumerable
★  observablecollection
★  collection

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Speaking about ienumerable, one probably shouldn't forget about linq.

Other search terms related to ienumerable and their ratings are:
★★★★★ linq
★★★ foreach
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