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Quizzes > Quizzes for Business > Technology

Take the Advanced C# Programming Quiz

Sharpen your coding skills with tough C# questions

Difficulty: Moderate
Questions: 20
Learning OutcomesStudy Material
Colorful paper art showcasing a trivia quiz on Advanced C Programming

Looking to test your skills in advanced C# programming? This comprehensive advanced C# quiz invites experienced developers to evaluate their mastery of generics, async/await, and design patterns. Ideal for those who have completed the C# Programming Basics Quiz or explored the Functional Programming Knowledge Quiz. Participants will gain deeper insight into C# architecture and boost coding confidence. Feel free to customize any question in our quizzes editor to suit your learning goals.

What does LINQ stand for in C#?
Language Integrated Query
Linked Internal Queue
Local Inline Query
Logical Iterable Query
LINQ stands for Language Integrated Query, which allows querying various data sources in a consistent way within C#. The other options do not match the official acronym used in .NET.
Which return type is recommended for an async method in C# that does not return a value?
Action
Task
void
Thread
An async method that does not return a result should use Task as its return type to allow proper awaiting and exception propagation. Using void is only appropriate for event handlers.
How do you declare a generic class named MyClass in C#?
class MyClass {}
class MyClass() {}
class MyClass {}
class MyClass[] {}
Declaring a generic class requires angle brackets with a type parameter, e.g., MyClass. The other syntaxes are not valid generic class declarations in C#.
Which keyword is used in C# to define a delegate type?
delegate
func
action
event
The keyword delegate is used to define a delegate type in C#. Func and Action are predefined generic delegates, and event is used for event declarations.
Which of the following is the automatic memory management mechanism used by .NET?
Garbage Collector
Memory Pool
Stack Allocator
Manual Dispose
.NET relies on the Garbage Collector to manage memory allocation and deallocation automatically. Manual Dispose and memory pools are developer-managed mechanisms but are not the core automatic system.
Given the LINQ method syntax numbers.Where(n => n % 2 == 0).Select(n => n * n), what is the type of the result?
List
IEnumerable
IQueryable
int[]
The Where and Select methods on an IEnumerable return another IEnumerable via deferred execution. It does not automatically convert to a List or array unless explicitly materialized.
What is the primary function of the await keyword in C#?
Pauses execution of the async method and returns control until the awaited Task completes
Ensures code executes on the calling thread
Blocks the current thread until completion
Cancels an asynchronous operation
Await yields control back to the caller of the async method until the awaited Task completes, without blocking the thread. It does not cancel operations or force execution on a specific thread.
Which generic type constraint in C# ensures that the type argument has a parameterless constructor?
where T : new()
where T : class
where T : IDisposable
where T : struct
The new() constraint requires that the type argument has a public parameterless constructor. Class, struct, and IDisposable constraints impose reference type, value type, or interface implementation requirements instead.
Which built-in delegate type in C# represents a method that returns void and takes no parameters?
Action
EventHandler
Func
Predicate
Action is a built-in delegate type that represents a method returning void with no parameters. Func delegates return a value, Predicate takes one argument and returns bool, and EventHandler has a specific signature.
Which class in .NET reflection is primarily used to obtain metadata about a type at runtime?
TypeInfo
Reflection
Type
MetaClass
The System.Type class is the main entry point for reflection metadata in .NET. TypeInfo is part of the reflection API but is obtained from Type, and the other names are not valid classes.
Which of these can help reduce large object heap fragmentation in .NET applications?
GC.SuppressFinalize
ArrayPool
lock statement
volatile keyword
ArrayPool allows renting and returning large arrays, reducing allocations on the large object heap and helping prevent fragmentation. The other options are unrelated to heap fragmentation.
Which design pattern ensures that a class has only one instance and provides a global point of access to it?
Strategy
Observer
Singleton
Factory
The Singleton pattern restricts the instantiation of a class to a single object and provides a global access point. Factory, Strategy, and Observer solve different design problems.
Which SOLID principle states that software entities should be open for extension but closed for modification?
Single Responsibility Principle
Open/Closed Principle
Dependency Inversion Principle
Liskov Substitution Principle
The Open/Closed Principle specifies that classes should allow their behavior to be extended without modifying existing code. The other principles address different aspects of design.
In C#, which block of a try/catch structure is executed regardless of whether an exception is thrown?
catch
finally
throw
error
The finally block always executes after the try and catch blocks, whether an exception occurs or not. Catch only runs when an exception is thrown, and throw and error are not blocks.
What is the effect of calling ConfigureAwait(false) on a Task in an async method?
It prevents capturing the synchronization context for the continuation
It forces the continuation to run on the UI thread
It cancels the task if it does not complete quickly
It logs exceptions without throwing them
ConfigureAwait(false) tells the awaiter not to capture the current synchronization context, which can improve performance and avoid deadlocks. It does not cancel tasks or handle exceptions.
What is the key difference between IQueryable and IEnumerable in LINQ?
IQueryable uses expression trees to translate queries to the data source and defer execution until requested
IQueryable executes all filtering in memory after loading data
IEnumerable builds expression trees for deferred execution
IEnumerable translates queries to SQL and runs them on the server
IQueryable builds an expression tree that can be translated by the data provider (e.g., SQL) and executed remotely. IEnumerable runs filtering and projection in memory using delegates.
What common issue arises from using async void methods in C#?
They automatically retry on failure
They cannot be awaited or have their exceptions caught by the caller
They use more memory than Task-returning methods
They always block the calling thread
Async void methods cannot be awaited and any exceptions they throw escape the method boundary, making error handling unreliable. They are intended primarily for event handlers.
Which of the following interfaces in C# demonstrates covariance in its type parameter?
IList
IEnumerable
IDisposable
IComparable
IEnumerable declares its type parameter as out, enabling covariance for return types. IList is invariant, and the other interfaces are not defined with covariant parameters.
How can you create an instance of a type at runtime using .NET reflection?
Call type.New()
Invoke type.InvokeConstructor()
Use Activator.CreateInstance(type)
Use new Reflection(type)
Activator.CreateInstance(Type) is the standard method to construct an object when you have its Type at runtime. The other methods are not part of the reflection API for instantiation.
According to the Dependency Inversion Principle in SOLID, which statement is true?
Low-level modules should depend on concrete implementations
High-level modules should directly instantiate low-level modules for performance
Abstractions should depend on details
High-level modules should depend on abstractions, not on low-level modules
The Dependency Inversion Principle dictates that both high- and low-level modules should rely on abstractions rather than concrete implementations. This reduces coupling and improves flexibility.
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Learning Outcomes

  1. Analyse complex LINQ queries and lambda expressions.
  2. Evaluate asynchronous programming using async/await patterns.
  3. Master advanced features like generics, delegates, and reflection.
  4. Identify best practices for memory management and optimization.
  5. Demonstrate understanding of C# design patterns and SOLID principles.
  6. Apply error handling and debugging techniques in real-world scenarios.

Cheat Sheet

  1. Mastering LINQ Queries and Lambda Expressions - Ready to slice and dice your data like a code chef? LINQ lets you filter, transform, and aggregate collections in one neat statement using lambda expressions. It's both concise and powerful, making your code look like magic! Introduction to LINQ (Microsoft Docs)
  2. Implementing Asynchronous Programming with async/await - Feel like your app is stuck in traffic? async/await lets you cruise past blocking calls so your UI stays snappy. Learn exception handling and proper resource management in async methods to keep everything running smoothly. Asynchronous Programming with async and await (Microsoft Docs)
  3. Utilizing Generics for Type Safety and Reusability - Tired of rewriting the same code for different data types? Generics are your best friend - they let you build reusable containers and methods that enforce compile-time type checks. Your code becomes cleaner and safer in one go! Generics (Microsoft Docs)
  4. Understanding Delegates and Events - Want to wire up callbacks and event-driven magic? Delegates act as type-safe pointers to methods, and events let you subscribe or publish notifications. Mastering these concepts powers up your responsive application design. Delegates and Events (Microsoft Docs)
  5. Exploring Reflection for Metadata Inspection - Curious about what's inside your objects at runtime? Reflection opens the doors to inspect types, methods, and properties on the fly. It's perfect for plugin systems, serialization, and dynamic behaviors! Reflection (Microsoft Docs)
  6. Implementing Effective Memory Management - Keep your app lean and mean by mastering IDisposable, using statements, and understanding the garbage collector's life cycle. Proper cleanup of unmanaged resources prevents nasty memory leaks and performance hiccups. Garbage Collection (Microsoft Docs)
  7. Applying Design Patterns and SOLID Principles - Level up your architecture with proven patterns like Singleton, Factory, and Observer. Embrace SOLID principles to write code that's easy to maintain, extend, and test. Your future self (and team) will thank you! GRASP and SOLID Principles (Microsoft Docs)
  8. Implementing Robust Error Handling - Don't let exceptions crash your party - learn to catch, log, and recover from errors gracefully. Proper use of try-catch-finally ensures resources are released and issues are tracked for smooth debugging. Exception Handling (Microsoft Docs)
  9. Mastering Debugging Techniques - Become a bug detective using breakpoints, watch windows, and step-through execution in Visual Studio. Inspect variables and call stacks to uncover issues fast and level up your troubleshooting skills. Debugging in Visual Studio (Microsoft Docs)
  10. Optimizing Performance in C# Applications - Speed up your code by choosing the right data structures, minimizing allocations, and profiling for bottlenecks. Even small tweaks like swapping a List for a HashSet can supercharge your app! Performance Best Practices (Microsoft Docs)
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