Does LINQ work with IEnumerable?

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You can use Cast<T>() or OfType<T> to get a generic version of an IEnumerable that fully supports LINQ.

Eg.

IEnumerable objects = ...;
IEnumerable<string> strings = objects.Cast<string>();

Or if you don’t know what type it contains you can always do:

IEnumerable<object> e = objects.Cast<object>();

If your non-generic IEnumerable contains objects of various types and you are only interested in eg. the strings you can do:

IEnumerable<string> strings = objects.OfType<string>();

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