Event declaration syntax in C Sharp (C#) - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to declare an event named OnChange of type EventHandler.

C Sharp (C#)

public event [1] OnChange;

Drag options to blanks, or click blank then click option'

AEventHandler

Bdelegate

Cevent

DAction

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'delegate' keyword instead of the event type.

Using 'event' keyword twice.

Using 'Action' without proper delegate signature.

The correct syntax to declare an event uses the event type, here 'EventHandler'.

2fill in blank

medium

Complete the code to declare an event named DataReceived using a custom delegate DataHandler.

C Sharp (C#)

public delegate void DataHandler(string data);
public event [1] DataReceived;

Drag options to blanks, or click blank then click option'

AFunc<string>

BEventHandler

CAction<string>

DDataHandler

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'EventHandler' instead of the custom delegate.

Using 'Func' which is not a valid event delegate here.

Using 'Action' without declaring it.

The event must be declared with the delegate type 'DataHandler' to match the custom delegate.

3fill in blank

hard

Fix the error in the event declaration by completing the code.

C Sharp (C#)

public [1] OnUpdate;

Drag options to blanks, or click blank then click option'

AEventHandler event

Bvoid event EventHandler

Cevent EventHandler

Ddelegate void EventHandler()

Attempts:

3 left

💡 Hint

Common Mistakes

Placing 'delegate' keyword incorrectly.

Swapping order of 'event' and delegate type.

Including 'void' keyword in the event declaration.

The correct syntax is 'event EventHandler' before the event name.

4fill in blank

hard

Fill both blanks to declare an event named ProcessCompleted using a delegate named ProcessHandler.

C Sharp (C#)

public [1] [2] ProcessCompleted;

Drag options to blanks, or click blank then click option'

Aevent

Bdelegate

CProcessHandler

Dvoid

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'delegate' keyword instead of 'event'.

Using 'void' instead of the delegate type.

Swapping the order of keywords.

The correct syntax is 'event ProcessHandler ProcessCompleted;' to declare the event.

5fill in blank

hard

Fill all three blanks to declare an event named Alert using a delegate named AlertHandler with no parameters.

C Sharp (C#)

public [1] [2] [3];

Drag options to blanks, or click blank then click option'

Aevent

BAlertHandler

CAlert

Ddelegate

Attempts:

3 left

💡 Hint

Common Mistakes

Including 'delegate' keyword in the declaration line.

Swapping delegate type and event name.

Omitting the 'event' keyword.

The correct declaration is 'public event AlertHandler Alert;' for the event.