Finals Flashcards
Unlike reference types, nullable types are tested for null using the IComparable method.
F
If variable x is null and variable y is false, then x|y is false
F
The Dictionary type is used to define a collection of key-value paris.
T
What is a generic class?
It is built using whatever type or types are passed into it when it is instantiated.
Give a statement declaring the variable X to be a nullable integer type.
int?x;
What is the purpose of the null coalescing operator?
Supplies alternative values if expression is null.
What is the null coalescing operator?
”??”
Give a statement declaring the varialbe students to be a generic collection that holds a collection of objects of type Student.
List students;
C# is a typesafe language
T
Operators can be roughly classified into three categories: numary, binary, and turnary.
F
A delegate is a type that enables a program to store references to functions.
T
InC#, all classes derive from the base class Parent at the root of all classes.
F
When an object is assigned to a variable, the variable actually receives a pointer to the object.
T
Protected class members are accessible only from code that is part of the class or from a class derived from it.
T
Fields, methods, and properties can also be declared using the keyword ‘global’ which means the are static members owned by the class.
F
Automatic properties must include both a Get and Set accessor.
T
Class definitikons can be split across multiple code fiels using the ‘partial’ keyword.
T
A class that implements an interface must implement all of the members defined by the interface as public.
T
Arrays in C# are implemented as instances of the ‘System.Array class and are just one type of what are known as colleciton classes.
T
Custom collection classes can be strongly typed.
T
The ‘GetIEnumerator’ mehtod allows iterating over a class.
F
An iterator is a block of code that supplies all the values used in a foreach block.
T
The ‘is’ operator can be used in a program to check whether an object either is or can be converted into a given type.
T
What is the term for the .net method of freeing up unused memory?
Garbage colleciton.
What are the loop statements in C#.
do while, do, for
What is the difference between implicit and explicit conversions?
Implicit conversions are done by the compiler automatically. Explicit conversions are done by the programmer.
What is a struct?
A struct is a data structure that is compiled of data members, which can be of different types.
By definitions, const members have what accessibility level?
Static
Why are properties the preferred way to access the state of an object?
To protect external code from implementation details.
What is the keyword ‘this’ used for in C#?
it refers to the current instance of an object.
Why would a programmer use the ‘new’ keyword in defining interface members.
To hide the parent interface members.
What are indexers?
Special properties that provide array-like access.
The ‘IEnumerable’ interface enables a program to use what kind of loop?
If
What are two types of comparisons between objects?
Value and Type
What is boxing?
Changing the type an object is into a System.Object type, or an Interface type.
What does operator overloading enable a progrmmer to do?
Manipulate the way an operator behave.
What is the function of the ‘as’ operator.
converts a type into a specified reference type.
Only ‘T’ can be used as the parameter when creating generic classes.
F
Generic classes cannot be inherited from.
F
When an interface inherits from a generic interface, it must keep the constraints of the base interface generic type parameters.
T
Defining a generic delegate simply requires using one or more generic type parameters
T
Subscribing to an event means supplying code that will be executed when an event is raised.
T
Event handlers are methods.
T
There is an equivalent to the try…catch structure for handling events.
F
Instead of defining event handler methods, the programmer can choose to use anonymous methods.
T
[StepBy] tells VS not to step into code during debugging.
F
It is possible to create attributes by deriving from the System.Attribute class.
T
What syntax signifies a generic class in C#?
using the angle brackets. EX: MyClass{}
What constraint does ‘struct’ put on a generic type?
Struct constraints require the type to be of a value.
What is a generic method?
A mehtod in which the return and or parameters are set based on the generic type.
What are nullible types?
Nullible types are types that allow both the thype values and the null value.
What does the ?? operator do?
Takes the value of the first operand, unless it is a null value; in which case it takes the value of the second operand.
What does the :: operator do?
Another way to address the type in a namespace.
What is the ‘object source’ as the term applies event handling?
A method without a name used as target for a delegate.
What is ‘decorating’ ?
Adding attributes to code.
What is ‘reflection’?
Way to get attributes information in a program.
One of XAML’s shortfalls is its inability to render 3D graphics.
F
A dependency property is registered with the WPF property system to allow extended functionality.
T
Routed events are usually associated with non-user actions.
F
A routed event can travel up and down the hierarchy of the control on which the event occurred.
T
Routed commands, like events, can cause code to execute.
T
The Panel class directory can be used for control layout.
F
The canvas control provides complete freedom over control positioning.
T
What is a code-behind file?
C# files that are dynamically linked to the XAML files.
What does WYSIWYG?
What you see is what you get.
Where does Visual Studio put the code-behind files?
Visual Studio puts code-behind files in the same directory as XAML files.
What is the term for configuring sets of related properties so that they all update in response to a change to one of them?
Coercion.
All content layout controls derive from which abstract class?
Panel class.
What does ‘Margin’ refer to with regard to controls?
Space left bland around the edges of a control.
A TextBox control by default wraps text.
F
The normal operation for a groups of CheckBoxes is that when one of them is checked, any other that was checked is unchecked.
F
By default pages are constructed of TabItems.
T
Which control allows displaying and re-sizing a single image?
image control.
How many different states can a CheckBox be in?
Three.
Which control allows selecting multiple text items?
ListBox
What base class do Triggers inherit from?
Trigger Base
Most controls in >NET derive from the System.Windows.Forms.Control class.
T
Double-Clicking a control will create the default event for the given control?
T
Radio Buttons are used to play audio files?
F
A CheckBox control traditionally displays itself as a label with a small box at its immediate left.
T
The RadioButton control derives from CheckBox base.
F
When a control is placed on a form, the form is said to become the parent of the control, and hence the control is the child of the form.
T
List boxes are used to show a list of strings from which only one can be selected at a time.
F
When using an ImageList control, you can add images to the ImageList at both design time and runtime.
T
What does RAD stand for?
Rapid Application Development.
What property specifies how the control behaves when a user resizes the window?
Anchor property.
What event is most associated with Button Events?
Click event.
Button, CheckBox, and RadioButton all derive from what common class?
ButtonBox
To group radio buttons together so they create one logical unit, you must use what?
Group Box
What are the three states a checkbox can have?
true, false, intermediate
Which control is used to display and enter formatted text?
RichTextBox
What control is used to show a list of strings from which one or more can be selected at a time?
ListBox
