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.NET > C# GUI Forms / Inheritance / Polymorphism > Flashcards

C# GUI Forms / Inheritance / Polymorphism Flashcards

1
Q

What does the label control do?

A

Displays images or uneditable text.

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2
Q

What does the TextBox control do?

A

Enables the user to enter data via the keyboard. It also can be used to display editable or uneditable text.

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3
Q

What does the Button control do?

A

Triggers an event when clicked with the mouse.

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4
Q

What does the checkbox control do?

A

Specifies an option that can be selected (checked) or unselected (not checked)

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5
Q

What does the combobox control do?

A

Provides a drop-down list of items from which the user can make a selection either by clicking an item in the list or by typing in a box.

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6
Q

What does the listbox control do?

A

Provides a list of items from which the user can make a selection by clicking one or more items.

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7
Q

What does the panel control do?

A

A container in which controls can be placed and organized

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8
Q

What does the numericupdown control do?

A

Enables the user to select from a range of numeric input values.

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9
Q

What is a form?

A
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10
Q

What happens when you drag an item from the toolbox onto the form?

A

Visual studio generates code that created the object and set its basic properties. The IDE maintains the generated code in a separate file using partial classes

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11
Q

What is the accept button property?

A

Default button thats clicked when you press enter

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12
Q

What is the auto scroll property?

A

bool value (false by default) that allows or disallows scrollbars when needed.

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13
Q

What is the cancelbutton property?

A

Button thats clicked when the escape key is pressed

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14
Q

What is the formborderstyle property?

A

Border style for the form (sizable by default).

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15
Q

What is the font property?

A

Font of text displayed on the form, and the default font for controls added to the form.

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16
Q

What is the text property?

A

Text in the forms title bar

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17
Q

What is the close method?

A

Closes a form and releases all resources, such as the memory used for the forms content. A closed form cannot be reopened.

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18
Q

What is the hide button?

A

Hides a form, but does not destroy the form or release its resources.

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19
Q

What does the show method do?

A

Displays hidden form.

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20
Q

What does the load even do?

A

Occurs before a form is displayed to the user.

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21
Q

What is an event handler?

A

GUIs are event driven. When the user interacts with a GUI component, the event drives the program to perform a task. A method that performs a task in response to an even it called an event handler.

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22
Q

What does an event handler look like?

A
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23
Q

How do you create the default event handler for a form control?

A

Double click on the form control.

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24
Q

What are the two parameter every event handler receives when its called?

A
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25
Q

Where is the auto generated GUI code placed in visual studio?

A

in the Designer.cs file of the form

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26
Q

How would you modify the GUI controls?

A
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27
Q

What is a delegate?

A
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28
Q

What is a multicast delegate?

A
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29
Q

What is another way to create event handlers?

A

Another Way to Create Event Handlers is Using the Properties Window to Create Event Handlers Controls can generate many different events. Clicking the Events icon (the lightning-bolt icon) in the Properties window (Fig. 14.8), displays all the events for the selected control.

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30
Q

How do you search for a controls documentation in Visual Studio?

A
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31
Q

How do you change the controls background colour?

A

with the BackColor property

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32
Q

How do you edit the controls baground image?

A

with the BackgroundImage property

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33
Q

What does the enabled property do?

A
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34
Q

What does the focused property do?

A

Indicates whether the control has the focus (only available at runtime)

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35
Q

how do you choose what font is used to display the controls text?

A

the font property

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36
Q

How do you choose what the controls foreground color is?

A

The ForColor property. This usually determines the color of the text in the Text Property

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37
Q

What does the TabIndex property do?

A

The tab order of the control. Then the tab key is pressed, the focus transfers between controls based on the tab order. You can set this order.

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38
Q

What does the TabStop property do?

A

If true, then a user can give focus to this control via the Tab key

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39
Q

What does the text property do?

A

The text associated with control. The location and appearance of the text vary depending on the type of control.

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40
Q

What does the visible property do?

A

Indicates whether the control is visible

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41
Q

What method hides the control?

A

The Hide method

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42
Q

What method acquires the focus?

A

the Select method

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43
Q

What method shows the control?

A

the Show method

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44
Q

What is anchoring and how does it work?

A
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45
Q

What does the anchoring window look like?

A
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46
Q

What is docking?

A
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47
Q

What does a docked control look like?

A
48
Q

What does the anchor property do?

A

Causes a control to remain at a fixed distance from the side(s) of the container even when the container is resized.

49
Q

What does the dock property do?

A

Allows a control to span one side of its container or to fill the remaining space in the container

50
Q

What does the Padding property do?

A

Sets the space between a container’s edges and docked controls. The default is 0, causing the control to appear flush with the container’s side.

51
Q

What does the location property do?

A

Specifies the location (as a set of coordinates) of the upper-left corner of the control, in relation to its container’s upper-left corner.

52
Q

What does the size property do?

A

Specifies the size of the control in pixels as a Size object, which has properties Width and Height.

53
Q

What does the minimumSize/maximumSize methods do?

A

Indicates the minimum and maximum size of a control, respectively.

54
Q

What do snap lines do?

A
55
Q

What do labels do?

A

Labels display text that the user cannot directly modify

56
Q

What are some common label properties?

A
57
Q

What is a textbox?

A

A textbox is an area in which either text can be displayed by a program or the user can type text via the keyboard.

58
Q

How do you turn a textbox into a password textbox that hides the characters?

A

Set the property UseSystemPasswordChar to true

59
Q

What are some common properties / events in textboxes?

A
60
Q

What is a button?

A

A button is a control that the user clicks to trigger a specific action or to select an option in a program. A program can user several types of buttons, but all the button classes derive from class ButtonBase

61
Q

What are the common properties and click event for buttons?

A
62
Q

What are group boxes and panels?

A
63
Q

What are the common groupbox properties?

A

Controls - The set of controls that the groupbox contains

Text - Specifies the caption text displayed at the top of the Groupbox

64
Q

What are the common panel properties?

A

AutoScroll - Indicates whether scrollbars appear when the panel is too small to display all of its controls. The default value is false.

BorderStyle - Sets the border of the Panel. The default value is none; other options are Fixed3D and FixedSingle.

Controls - The set of controls that the Panel contains.

65
Q

How would you create and use a groupbox or panel?

A
66
Q

What would the panel scrollbars look and act like?

A
67
Q

What are checkboxes?

A
68
Q

What are the common checkbox properties and events?

A
69
Q

How would you combine font styles with bitwise operators?

A
70
Q

What are radio buttons?

A
71
Q

When should you use radio buttons over checkboxes?

A

When the user should choose only one option in a group. Checkboxes are when the user should be able to choose multiple options in a group.

72
Q

What are the radio buttons common properties and events?

A
73
Q

How would you change buttons based on option chosen by radio button?

A
74
Q

What does a picture box control do?

A

Displays an image

75
Q

What are the common properties for the picturebox?

A
76
Q

What are teh common events for pictureboxes?

A
77
Q

How would you retrieve an image from resources and load it into a picturebox?

A
78
Q

How would you add a resource and why?

A
79
Q

Where are a projects resources stored?

A
80
Q

What are tool tips?

A

The helpful text that appears when the mouse hovers over an item in a GUI

81
Q

What are the common properties and events for the tool tip

A
82
Q

Where does the tooltip component appear?

A
83
Q

What is the numericUpDown control?

A
84
Q

What are the common properties for NumericUpDown?

A
85
Q

What is the common event for the numericupdown?

A
86
Q

How are mouse events handled?

A
87
Q

What are the mouse events with event argument of type eventargs?

A
88
Q

What are the mouse events with event argument of type mouseeventargs?

A
89
Q

What are the properties of class MouseEventArgs?

A
90
Q

How and why using the USING which will Dispose a graphics object after?

A
91
Q

What are the three key events for keyboard even handling?

A
92
Q

What are the keyboard events and event arguments?

A
93
Q

What would some code look like that displayed the current key press?

A
94
Q

How would you cause a button to be clicked when the Enter key is pressed on a form?

A

Set the forms accept button properly

95
Q

What is specialization?

A

A derived class.

96
Q

How does generalization compare to specialization?

A

Base Class.

97
Q

What would a UML class diagram of generalized and specialized classes look like?

A
98
Q

What is factoring?

A
99
Q

What would factoring look like in a uml class diagram?

A
100
Q

How do you hide the base class method?

A
101
Q

What would the code look like to hide the drawcontrol method?

A
102
Q

How and why would you call the base class constructor?

A
103
Q

Can the derived class inherit the base constructor?

A

No.

104
Q

Is hiding a parent classes method the go to choice?

A
105
Q

How do you create and implement polymorphism?

A
106
Q

What is the difference between abstract and virtual methods?

A
107
Q

How do you override virtual methods?

A
108
Q

Can you override an overridden method?

A

Yes!

109
Q

How does versioning work with new and override?

A
110
Q

What is an abstract class and why do we use them?

A
111
Q

How do you designate an abstract class and method?

A
112
Q

What is the idea behind abstraction?

A
113
Q

What are sealed classes and how do they work?

A
114
Q

What is the root of all classes: Object?

A
115
Q
A

.NET (8 decks)

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