Shorter syntax for casting from a List to a List?

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If X can really be cast to Y you should be able to use

List<Y> listOfY = listOfX.Cast<Y>().ToList();

Some things to be aware of (H/T to commenters!)

  • You must include using System.Linq; to get this extension method
  • This casts each item in the list – not the list itself. A new List<Y> will be created by the call to ToList().
  • This method does not support custom conversion operators. ( see Why does the Linq Cast<> helper not work with the implicit cast operator? )
  • This method does not work for an object that has an explicit operator method (framework 4.0)

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