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home / developersection / interviews / what are func, action, and predicate delegates? when do you use them?
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What are Func, Action, and Predicate delegates? When do you use them?

Ravi Vishwakarma 306 22 Jun 2025
c# c#
Updated 22 Jun 2025
Ravi Vishwakarma
Ravi Vishwakarma

IT-Hardware & Networking

Ravi Vishwakarma is a dedicated Software Developer with a passion for crafting efficient and innovative solutions. With a keen eye for detail and years of experience, he excels in developing robust software systems that meet client needs. His expertise spans across multiple programming languages and technologies, making him a valuable asset in any software development project.

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Ravi Vishwakarma
Ravi Vishwakarma 22 Jun 2025
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What are Func<>, Action<>, and Predicate<> delegates? When do you use them?


These are built-in generic delegates:

  • Func<T, TResult>: Takes parameters, returns a value.
  • Action<T>: Takes parameters, returns void.
  • Predicate<T>: Takes one input, returns bool.
Func<int, int, int> add = (a, b) => a + b;
Action<string> print = msg => Console.WriteLine(msg);
Predicate<int> isEven = x => x % 2 == 0;

Use them with LINQ, events, callbacks, or to make APIs more flexible.

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