Why Func instead of Predicate?

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While Predicate has been introduced at the same time that List<T> and Array<T>, in .net 2.0, the different Func and Action variants come from .net 3.5.

So those Func predicates are used mainly for consistency in the LINQ operators. As of .net 3.5, about using Func<T> and Action<T> the guideline states:

Do use the new LINQ types Func<> and
Expression<> instead of custom
delegates and predicates

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