Question 1

Given a GUI Control , what objects and delegates are provided to handle mouse events such as clicking, pointing, and dragging?

Accepted Answer

Mouse events include all the actions a user takes with a mouse, including clicking, pointing, and dragging. Mouse events can be handled for any Control through an object of the class MouseEventArgs . The delegate used to create mouse event handlers is MouseEventHandler . Every mouse event-handling method must have two parameters: an object representing the sender, and an object representing the event. Depending on the event, the type of the second parameter is EventArgs or MouseEventArgs .

Question 2

The code generated in Design mode in the IDE is not meant to be altered by typing. You should modify Control properties through the Properties window in the IDE.

Accepted Answer

A) True 
 B)False  True

Question 3

When an event occurs, any delegate that a client has given or passed to the event is invoked.

Accepted Answer

A) True 
 B)False  True

Question 4

Assume you declare three delegates named delegate1 , delegate2 , and delegate3 . You then assign a reference to method M1() to delegate1 , and a reference to method M2() to delegate2 . How do you make delegate3 into a composed delegate that executes both M1() and M2() ? What are the rules concerning return type and parameter list for composed delegates?

Accepted Answer

When the statement delegate3 = delegate1

Question 5

The first parameter of an event-handler method is an object named ____________________; it is a reference to the object that generated the event.

Accepted Answer

The answer of The first parameter of an event-handler method...

Question 6

What are the default conventions for naming event handlers?

Accepted Answer

Conventionally, event handlers are named

Question 7

When you define your own event-handler delegate, what arguments are required? Provide an example of a delegate declaration.

Accepted Answer

Just like the event handlers automatical

Question 8

Match between columns
                        Premises: Used to notify an object's client of a change that has occurred in the object
A type of delegate that lets you invoke multiple method calls using a single statement
A delegate used to create mouse event handlers
The control that generates an event
The technique of packaging an object's attributes and methods into a cohesive unit that can then be used as an undivided entity
Shown in the Properties window of the IDE, and looks like a lightning bolt
Generated when a Button object is clicked
Also known as an event-handler method
Represents an event that contains no event data

Accepted Answer

The Answer of composed delegate and event and event sender is...

Question 9

What are the two actions that can be taken on an event field?

Accepted Answer

You can take only two actions

Question 10

An event-handler method is also known as a(n) ____.

Accepted Answer

A)  event source 
B)  event sender 
C)  sender object 
D)  event receiver 
A)  event source 
B)  event sender 
C)  sender object 
D)  event receiver

Question 11

When you open the ____ file in an IDE, you can examine all the code generated by the Windows Form Designer for an application that creates a Form .

Accepted Answer

A)  Designer.cs 
B)  EventHandlers.cs 
C)  Project.cs 
D)  Form.cs 
A)  Designer.cs 
B)  EventHandlers.cs 
C)  Project.cs 
D)  Form.cs

Question 12

Programmers say that a button click ____ an event.

Accepted Answer

A)  raises 
B)  closes 
C)  deletes 
D)  revokes 
A)  raises 
B)  closes 
C)  deletes 
D)  revokes

Question 13

Given the delegate declaration:   delegate void GreetingDelegate(string s); 
What do you know about any method that is represented by this delegate? In general, what can you tell about a method if you know it is encapsulated by a particular delegate?

Accepted Answer

The GreetingDelegate shown can encapsula

Question 14

The ____ class static field named Empty represents an event that contains no event data.

Accepted Answer

A)  delegate 
B)  EventArgs 
C)  EventHandler 
D)  MouseArgs 
A)  delegate 
B)  EventArgs 
C)  EventHandler 
D)  MouseArgs

Question 15

Keyboard events are also known as ____.

Accepted Answer

A)  key events 
B)  external events 
C)  input events 
D)  console events 
A)  key events 
B)  external events 
C)  input events 
D)  console events

Question 16

To declare your own event, you use a ____.

Accepted Answer

A)  handler 
B)  trigger object 
C)  delegate 
D)  raiser 
A)  handler 
B)  trigger object 
C)  delegate 
D)  raiser

Question 17

The ____ event occurs when the mouse cursor leaves the Control 's boundaries.

Accepted Answer

A)  MouseClick 
B)  MouseEnter 
C)  MouseHover 
D)  MouseLeave 
A)  MouseClick 
B)  MouseEnter 
C)  MouseHover 
D)  MouseLeave

Question 18

____ occur when a user presses and releases keyboard keys.

Accepted Answer

A)  Mouse events 
B)  Button events 
C)  Key events 
D)  Form events 
A)  Mouse events 
B)  Button events 
C)  Key events 
D)  Form events

Question 19

A(n) ____ provides a way for the clients of a class to dictate methods that should execute when an event occurs.

Accepted Answer

A)  handler 
B)  event 
C)  delegate 
D)  trigger 
A)  handler 
B)  event 
C)  delegate 
D)  trigger

Question 20

Events must be declared as private .

Accepted Answer

A) True 
 B)False

Given a GUI Control , what objects and delegates are provided to handle mouse events such as clicking, pointing, and dragging?

The code generated in Design mode in the IDE is not meant to be altered by typing. You should modify Control properties through the Properties window in the IDE.

When an event occurs, any delegate that a client has given or passed to the event is invoked.

The first parameter of an event-handler method is an object named ____________________; it is a reference to the object that generated the event.

What are the default conventions for naming event handlers?

When you define your own event-handler delegate, what arguments are required? Provide an example of a delegate declaration.

What are the two actions that can be taken on an event field?

An event-handler method is also known as a(n) ____.

When you open the ____ file in an IDE, you can examine all the code generated by the Windows Form Designer for an application that creates a Form .

Programmers say that a button click ____ an event.

Given the delegate declaration: delegate void GreetingDelegate(string s); What do you know about any method that is represented by this delegate? In general, what can you tell about a method if you know it is encapsulated by a particular delegate?

The ____ class static field named Empty represents an event that contains no event data.

Keyboard events are also known as ____.

To declare your own event, you use a ____.

The ____ event occurs when the mouse cursor leaves the Control 's boundaries.

____ occur when a user presses and releases keyboard keys.

A(n) ____ provides a way for the clients of a class to dictate methods that should execute when an event occurs.

Events must be declared as private .

A First Program Using C

Using Data

Using Gui Objects and the Visual Studio Ide

Making Decisions

Looping

Using Arrays

Using Methods

Advanced Method Concepts

Using Classes and Objects

Introduction to Inheritance

Exception Handling

Using Controls

Files and Streams

Filters

Exam 13: Handling Events

Given a GUI Control , what objects and delegates are provided to handle mouse events such as clicking, pointing, and dragging?

The code generated in Design mode in the IDE is not meant to be altered by typing. You should modify Control properties through the Properties window in the IDE.

When an event occurs, any delegate that a client has given or passed to the event is invoked.

The first parameter of an event-handler method is an object named ____________________; it is a reference to the object that generated the event.

What are the default conventions for naming event handlers?

When you define your own event-handler delegate, what arguments are required? Provide an example of a delegate declaration.

What are the two actions that can be taken on an event field?

An event-handler method is also known as a(n) ____.

When you open the ____ file in an IDE, you can examine all the code generated by the Windows Form Designer for an application that creates a Form .

Programmers say that a button click ____ an event.

Given the delegate declaration: delegate void GreetingDelegate(string s); What do you know about any method that is represented by this delegate? In general, what can you tell about a method if you know it is encapsulated by a particular delegate?

The ____ class static field named Empty represents an event that contains no event data.

Keyboard events are also known as ____.

To declare your own event, you use a ____.

The ____ event occurs when the mouse cursor leaves the Control 's boundaries.

____ occur when a user presses and releases keyboard keys.

A(n) ____ provides a way for the clients of a class to dictate methods that should execute when an event occurs.

Events must be declared as private .

A First Program Using C

Using Data

Using Gui Objects and the Visual Studio Ide

Making Decisions

Looping

Using Arrays

Using Methods

Advanced Method Concepts

Using Classes and Objects

Introduction to Inheritance

Exception Handling

Using Controls

Files and Streams

Filters