All 17 Delegates, Events & Lambdas questions
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What is a delegate in C#? What is the difference between Func, Action and Predicate? What is a delegate in C#, and what does it represent conceptually? 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

How do you write and use a lambda expression as a shorthand for a delegate?

Beginner

Answer

A lambda expression `(parameters) => expression` provides a concise, inline way to define a small function without a separate named method declaration — it can be assigned directly to any compatible delegate type, including built-in ones like Func<> and Action<>.
Func<int, int, int> add = (a, b) => a + b;
Console.WriteLine(add(3, 4)); // 7

Action<string> greet = name => Console.WriteLine($"Hello, {name}");
greet("Sam");
Real-world example Passing a short, inline comparison or filtering expression directly to a LINQ method like Where() or OrderBy().

Common follow-ups: What's the difference between the built-in Func<> and Action<> delegate types?

LINQ
All 17 Delegates, Events & Lambdas questions