All 17 Delegates, Events & Lambdas questions
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What is the difference between Func, Action and Predicate? What is a delegate in C#, and what does it represent conceptually? How do you write and use a lambda expression as a shorthand for a delegate? What is a delegate in C#, and how does it enable passing methods as values? What is a closure and what is a common pitfall? How do events differ from plain delegates? What is an event, and how does it differ from a plain public delegate field? What are multicast delegates, and in what order do their subscribed methods get invoked? How does variable capture (closures) work in a C# lambda expression, and what pitfall occurs when capturing a loop variable? What causes event-handler memory leaks and how do you prevent them?
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C# › Delegates, Events & Lambdas

What is a delegate in C#?

Beginner

Answer

A delegate is a type-safe reference to a method, letting you pass behaviour as a parameter and invoke it later. Func<>, Action<> and Predicate<> are built-in delegates.
Func<int,int> square = x => x*x;
Action<string> log = Console.WriteLine;
Console.WriteLine(square(4)); // 16
Real-world example Passing a comparison or projection function into a sorting or LINQ method.
All 17 Delegates, Events & Lambdas questions