Declaration
Context: Declare a delegate using the delegate keyword, specifying the return type and parameter types.
Syntax
Section titled “Syntax”[access modifier] delegate returnType DelegateName(parameters);Example
Section titled “Example”public delegate void PrintMessage(string message);public delegate int Calculator(int a, int b);Delegate as a type
Section titled “Delegate as a type”Delegates are reference types. You can declare them at namespace or class level.
public class MathOperations{ public delegate double Operation(double x, double y);}Real-world usage example
Section titled “Real-world usage example”Defining custom callbacks: In UI frameworks, you might declare a delegate for validation callbacks (e.g., delegate bool ValidateInput(string input)).
Example: In ASP.NET Core, custom middleware often uses delegate declarations for request handling.