CSE 445 MIDTERM 2 EXAM QUESTIONS AND UPDATED CORRECT ANSWERS 2024/2025

CSE 445 MIDTERM 2 EXAM QUESTIONS AND UPDATED

CORRECT ANSWERS 2024/2025

What is a delegate?

A delegate is a reference type that can be used to reference a method. It encapsulates

the method.

How is delegate declared?

public delegate void MyDelegate();

Give delegate code to reference:

public static int Number(int x)

{

return x;

}

public delegate int NumDel(int x);



NumDel d1 = new NumDel(Number);

d1(2);

Give delegate code that would call all three methods when the delegate is

invoked:

public static void method1(){}, public static void method2(){}, public void

method3(){}

public delegate void MethodDel();

, MethodDel d = new MethodDel(method1);

d += new MethodDel(method2);



Class m3 = new Class();

d+= new MethodDel(m3.method3);



d();

The method that a delegate references or encapsulates has to have the same

what?

The method and delegate must have the same signature/prototype

After a delegate is declared, how do we use it?

Like a class, create an instance of the delegate with static or instance method passed

as parameter.

Delegates are similar to what in c++?

Delegates are similar to a function pointer in c++

Describe how a delegate can be used to define callback methods?

A delegate can be used to define callback methods my passing the name of the event

handler to the delegate reference

Give basic code of how to combine a delegate and an event.

1. Declare delegate:

public delegate void MyDelegate();

2. Declare event:

public static event MyDelegate Myevent;