Delegate declaration and instantiation in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare a delegate named MyDelegate that takes an int parameter.

C Sharp (C#)

public delegate [1] MyDelegate(int number);

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Astring

Bvoid

Cint

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using a return type other than void when the method should not return anything.

The delegate declaration requires the return type first. Here, void means the delegate method returns nothing.

2fill in blank

medium

Complete the code to instantiate the delegate with a method named PrintNumber.

C Sharp (C#)

MyDelegate del = new MyDelegate([1]);

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APrintNumber

BPrint

CShowNumber

DDisplay

Attempts:

3 left

💡 Hint

Common Mistakes

Using a method name that does not exist or does not match the delegate signature.

The delegate instance must be created with the exact method name that matches the delegate signature, here PrintNumber.

3fill in blank

hard

Fix the error in the delegate instantiation by completing the code.

C Sharp (C#)

MyDelegate del = [1] (PrintNumber);

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Adelegate

Bnew delegate

Cnew MyDelegate

DMyDelegate

Attempts:

3 left

💡 Hint

Common Mistakes

Omitting the 'new' keyword or using incorrect keywords.

To instantiate a delegate, you must use the new MyDelegate keyword followed by the method name.

4fill in blank

hard

Fill both blanks to declare a delegate named Calculator that returns an int and takes two int parameters.

C Sharp (C#)

public delegate [1] Calculator([2] a, int b);

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Aint

Bstring

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using different types for parameters or return type that don't match the requirement.

The delegate return type is int and the first parameter type is also int.

5fill in blank

hard

Fill all three blanks to instantiate a delegate named Calculator with a method named Add and invoke it with arguments 5 and 10.

C Sharp (C#)

Calculator calc = [1]([2]);
int result = calc([3], 10);

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Anew Calculator

BAdd

C5

DCalculate

Attempts:

3 left

💡 Hint

Common Mistakes

Forgetting 'new' keyword, using wrong method name, or wrong argument values.

You create a new delegate instance with new Calculator, pass the method Add, and invoke it with the first argument 5 and second argument 10.