C# Week 1

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What is visual studio?

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What is the .NET Framework

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What is MSIL?

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What are some services that the CLR provides?

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What happens after you run a program?

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What is an access specifier?

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The ( private, public, protected, internal, protected internal ) access specifier limits the accessibility of the member to within the defined class.

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The ( public, private, protected, internal, unsealed ) access specifier has no limits and any members or types defined as public can be accessed outside the class and even outside the assembly.

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( Internal, external, contained, package, protected ) is used when you want your class members to be accessible within the assembly.

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( Protected, Interal, Sealed, Packaged, Contained ) is used only when inheritance is used. Types or members using this modifier are only accessible from a child class.

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byte, int, float, char and decimal are ( value types, reference types ).

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Struct is a ( value type, reference type )

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Enumerations are a ( value type, reference type ).

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Class types are ( reference types., value types. )

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A delegate is a reference type.

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Arrays are value types.

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The default value of bool is ( false., true. )

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the default value of int is ( 0, 1 )

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The resources within your application are called ( managed code, unmanaged code, packaged code, maintained code )

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Managed code is directly executed by the MSIL.

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Any code developed in the .NET framework is managed code.

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Any code developed outside the .NET framework is known as ( unmanaged code, managed code, ethereal code, unpackaged code )

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FInalizers can be defined in structs.

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A class can only have one finalizer.

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Finalizers can be inherited and overloaded

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Finalizers cannot be called. They are invoked automatically.

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A finalizer can take modifiers and parameters.

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When should you use finalizers?

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The ( common language runtime, microsoft intermediate language, just in time compiler, machine language ) is in charge of managed code.

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When you compile a C#, Visual Basic, or F#, your output will be ( Intermediate Language, Machine, CLR, byte ) code.

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When you want to run code in intermediate language form, the CLR will take over and start the process of ( just in time, intermediate level, direct, standard ) compiling.

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A child class extending the parent class is an example of inheritance

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C# supports multiple inheritance.

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The ( virtual, protected, unsealed, public ) keyword is used to modify a method, property, indexer, or event declaration and allows it to be overridden in a derived class.

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The ( override, @override, inherit, extend ) modifier is required to extend or modify an abstract or virtual implementation.

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Overriding is a type of polymorphism.

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You can override a non-virtual or static method.

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A lambda expression is a block of code that is treated as ( an object, a method, a function, a struct )

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Lambda expressions can be represented as a delegate.

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x = > x * x

The left side of the lambda expression takes ( input parameters, variable, expression, constant ) and the right side contains the ( method declaration, expression )

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A delegate is

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Delegates are used to pass methods as arguments to other methods.

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Delegates allow ( methods, objects, structs, anything ) to be passed as parameters.

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Delegates cannot be used to define callback methods.

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Delegates can be chained together.

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Members marked as abstract must be implemented by classes that derive from the abstract class.

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An interface cannot have access specifiers for functions. It is public by default.

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An abstract class can have an access specifier for its functions.

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An interface can provide complete implementation and not just method signatures.

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Neither an interface not an abstract class can be instantiated.

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An ( interface, abstract class ) cannot have fields. An ( abstract class, interface ) can have defined fields and constants.

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An ( interface, abstract class ) can only have abstract methods whereas an ( abstract class, interface ) can have non-abstract methods.

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A class can ( inherit one or more interfaces, inherit only one interfaces, a maximum of 2 interfaces ) and only ( only one abstract class., exactly two abstract classes, one or more abstract classes )

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An interface ( cannot, must, can ) have a constructor declaration

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An abstract class ( can, cannot, must ) have the constructor declaration.

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The applied to a class, the sealed modifier prevents other classes from inheriting it.

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Use the abstract modifier in a class declaration to indicate that a class is intended only to be a base class of other classes, not instantiated on its own.

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A struct type is a value type that is typically used to encapsulate small groups of related variables

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A struct can be instantiated.

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A struct can be inherited.

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Structs can be instantiated without using the ( new, this, of, instantiate ) keyword.

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This represents a valid struct instantiation.

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The ( in, out, ref ) keyword is used to pass by reference by it's arguments cannot be modified by the called method.
The ( out, in, ref ) keyword's arguments must be modified by the called method.
The ( ref, out, in ) keyword's arguments MAY be modified.

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An argument that is passed to ref or in must be initialized before it is passed.

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Out parameters do not require initialized arguments to be passed.

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In arguments cannot be modified by the called method.

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( ref, in, out ) tells the compiler that the object is initialized before entering the function.

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( out, in, ref ) tells the compiler the compiler that the object will be initialized inside the function.

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With ( out, in, ref ), it is necessary to initialize the value of a parameter before returning to the calling method.

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The passing of a value through the ( ref, in, out ) parameter is useful when the called method also needs to change the value of the
passed parameter.

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The declaring of a parameter with the ( out, in, ref ) keyword is useful when a method returns multiple values.

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When the ( out, ref, in ) keyword is use, the data passed is one-way.

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When the ( ref, out, in ) keyword is used, the data may pass bidirectionally.

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Delegates can be used in implementing call-back methods or events.

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A ( delegate, namespace, callback, Enumerator ) is an ( object, method ) that refers to a ( method, object ).

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A function must be declared as a delegate before it's passed to another function.

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( Multicasting, Typecasting, Variedcasting, Casting ) of a delegate allows a user to point to more than one method in a single call.

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An action delegate saves you from defining a custom delegate

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Serialization is the process of converting an object into a stream of bytes.

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Serialization allows the developer to save the ( state, type, class ) of an object and recreate it when needed.

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To serialize an object in C#, you need the object to be serialized and, the stream to contain the serialized object, and a ( formatter., encapsulator, template, box )

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What is the namespace necessary to use serialization?

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It is not necessary to apply the SerializableAttribute attribute to an object before serializing it.

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The two type of serialization are:

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A ( dynamic link library, direct link library, class, namespace ) is a library that contains functions and code that can be used by more than one program at a time.

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When building a class library, you are building an assembly which contains DLLs.

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The ( StringBuilder, Builder, String, CharArray ) class represents a mutable string of characters.

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A ( partial class, child class, extended class, sibling class ) is used when a class definition is very large and not everything can be reasonably stored in a single class file.

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( Enum, struct, IEnumerable, IntGroup ) is used to declare a list of named integer constants.

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You can assign a null to int.

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a ( constant, readonly ) is defined at the time of declaration and cannot be changed whereas a a ( readonly, constant ) field can be changed at runtime inside a non-static constructor.

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Every class in C# is derived from the base class named Object.

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C#' s strong typing resolves at runtime.

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An explicit conversion should be done when there is a risk that an implicit conversion would lost information.

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Unit testing is done by both developer and testers.

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The ( arrange, act, assert ) section of a unit test method initializes objects and sets the value of the data that is passed to the method under test.

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The ( act, assert, arrange ) section of unit testing invokes the method under test with the arranged parameters.

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The ( assert, arrange, act ) section of a unit test verifies that the action of the method under test behaves as expected.

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The ( is, as ) operator is used to check if the run-time type of an object is compatible with the given type or not whereas ( as, is ) operator is used to perform conversion between compatible reference types or Nullable types.

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The keyword ( volatile, variable, changeable, recent ) ensures that all threads operating on an object will receive the latest value of the object when they receive it.

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Which of the following are generic types?

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Which of the following are non-generic types?

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Generic collections hold elements of the same datatype.

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Non-generic collections hold elements of the same datatype.

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There are 3 types of collections in C#.

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The process of converting a value type to a reference type is called

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A ( value type, reference type ) stores the value in its memory space whereas a ( reference type, value type ) stores the address of the value.

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The namespace for generics is

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int[1, 2, 3,] marks; is the correct way to declare an integer array

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int[] marks = new int[10] is will declare an integer array that can hold 10 values.

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IEnumerable<T> is an interface which supports iteration of a collection of a ( specified type., unspecified type )

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IEnumerable<T> is an interface that defines methods to manipulate generic collections.

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If using multiple catch blocks, the most specific exception should be caught first.

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( LINQ, Q.U.E.R.Y., LINK, LINKED ) is the name for a set of technologies that integrates query capabilities directly into the C# langauge.

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A destructor for an object can be declared by placing a _____ in front of the destructor name

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SOLID stands for Single Responsibility Principle, Open closed Principle, Liskov substitution Principle, Interface Segregation Principle, Dependency Integration Principle

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A private constructor is used to ensure that a class ( cannot be instantiated, must be instantiated, may be instantiated )

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The Single Responsibility Principle states that a class ( should only have one purpose, needs methods that perform one task, should only have one method, should only have one constructor )

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The Open-Closed Principle states that a Software Entity should be open for ( extension, modification ) but closed to ( modification, extension ).

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The Liskov substitution principle states that given a specific base class, any class that inherits from it can be a substitute for the base class.

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The Interface Segregation Principle suggests that ( having many specific interfaces, having one large interface, having many abstract classes, having many different classes ) is the best design.

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The ( Dependency Inversion Principle, Single Responsibility Principle, Liskov Substitution Principle, Interface Segregation Principle, Open-Closed Principle ) states that code should depend upon abstractions, not concrete implementations.

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A class should inherit everything from its base class and, if necessary, override any of those inherited methods if something needs to be changed. This is an example of _________.

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What does REST stand for?

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REST is loosely coupled.

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REST is stateless.

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REST can deliver data in multiple formats such as HTML, XML, JSON, YAML, etc.

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What does SOAP stand for?

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SOAP can return data in many formats such as XML, JSON, or HTML.

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Which of the following are components of a SOAP message?

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( SOAP, REST ) is a standardized protocol with pre-defined rules to follow.

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( REST, SOAP ) is an architectural style with loose guideline recommendations.

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( SOAP, REST ) can be stateful or stateless and ( REST, SOAP ) is stateless.

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( SOAP, REST ) is more secure than ( REST, SOAP ).

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REST would be more appropriate for enterprise environments.

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( Action, Func, Predicate ) delegates take no parameters and return nothing (they are void).
( Func, Action, Predicate ) delegates should be used if you are expecting return values.
( Predicate, Action, Func ) functions are a delegate or anonymous function which returns a boolean.

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A Tuple is a structure that contains a sequence of elements of different data types that can be used if you need to store an object with properties but don't want to create a separate type for it.

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A Tuple can hold a maximum of ( 8, 7, 4, 5, 6, 10 ) elements

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A nested class can be instantiated separately from its parent class.

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C# Quiz on C# Week 1, created by Eric Booker on 20/06/2019.

C# Week 1

What is visual studio?

What is the .NET Framework

What is MSIL?

What are some services that the CLR provides?

What happens after you run a program?

What is an access specifier?

The private public protected internal protected internal( private, public, protected, internal, protected internal ) access specifier limits the accessibility of the member to within the defined class.

The public private protected internal unsealed( public, private, protected, internal, unsealed ) access specifier has no limits and any members or types defined as public can be accessed outside the class and even outside the assembly.

Internal external contained package protected( Internal, external, contained, package, protected ) is used when you want your class members to be accessible within the assembly.

Protected Interal Sealed Packaged Contained( Protected, Interal, Sealed, Packaged, Contained ) is used only when inheritance is used. Types or members using this modifier are only accessible from a child class.

byte, int, float, char and decimal are value types reference types( value types, reference types ).

Struct is a value type reference type( value type, reference type )

Enumerations are a value type reference type( value type, reference type ).

Class types are reference types. value types.( reference types., value types. )

A delegate is a reference type.

Arrays are value types.

The default value of bool is false. true.( false., true. )

the default value of int is 0 1( 0, 1 )

The resources within your application are called managed code unmanaged code packaged code maintained code( managed code, unmanaged code, packaged code, maintained code )

The ( private, public, protected, internal, protected internal ) access specifier limits the accessibility of the member to within the defined class.

The ( public, private, protected, internal, unsealed ) access specifier has no limits and any members or types defined as public can be accessed outside the class and even outside the assembly.

( Internal, external, contained, package, protected ) is used when you want your class members to be accessible within the assembly.

( Protected, Interal, Sealed, Packaged, Contained ) is used only when inheritance is used. Types or members using this modifier are only accessible from a child class.

byte, int, float, char and decimal are ( value types, reference types ).

Struct is a ( value type, reference type )

Enumerations are a ( value type, reference type ).

Class types are ( reference types., value types. )

The default value of bool is ( false., true. )

the default value of int is ( 0, 1 )

The resources within your application are called ( managed code, unmanaged code, packaged code, maintained code )

Any code developed outside the .NET framework is known as ( unmanaged code, managed code, ethereal code, unpackaged code )

The ( common language runtime, microsoft intermediate language, just in time compiler, machine language ) is in charge of managed code.

When you compile a C#, Visual Basic, or F#, your output will be ( Intermediate Language, Machine, CLR, byte ) code.

When you want to run code in intermediate language form, the CLR will take over and start the process of ( just in time, intermediate level, direct, standard ) compiling.

The ( virtual, protected, unsealed, public ) keyword is used to modify a method, property, indexer, or event declaration and allows it to be overridden in a derived class.

The ( override, @override, inherit, extend ) modifier is required to extend or modify an abstract or virtual implementation.