C# and .NET Online Test
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The C# and .NET online test assesses knowledge of the .NET framework and its class library. This test includes live coding tasks in the C# programming language as it is the most used language for .NET.
The assessment includes work-sample tasks such as:
- Working with classes, objects, and interfaces to write reusable code.
- Implementing and properly using algorithms and data structures to optimize application performance.
- Using the Async-Await pattern to work with asynchronous code.
A good .NET developer needs a solid understanding of the C# programming language and the .NET framework class library in order to write robust and maintainable code.
Sample public questions
A turn-based strategy game has a grid with water and land. The grid contains a true value where it's water and false where it's land.
The player controls a boat unit with a particular movement pattern. It can only move to fixed destinations from its current position as shown in the image below:
The boat can only move in a direct path through water to the possible destinations, so a destination will become unreachable if there is land in the way.
Implement the CanTravelTo function, that checks whether a destination is reachable by the boat. It should return true for destinations that are reachable according to the pattern above, and false for unreachable or out of bounds destinations which are outside the grid.
For example, consider the following code:
bool[,] gameMatrix =
{
{false, true, true, false, false, false},
{true, true, true, false, false, false},
{true, true, true, true, true, true},
{false, true, true, false, true, true},
{false, true, true, true, false, true},
{false, false, false, false, false, false},
};
Console.WriteLine(CanTravelTo(gameMatrix, 3, 2, 2, 2)); // true, Valid move
Console.WriteLine(CanTravelTo(gameMatrix, 3, 2, 3, 4)); // false, Can't travel through land
Console.WriteLine(CanTravelTo(gameMatrix, 3, 2, 6, 2)); // false, Out of bounds
The following image shows valid and invalid destinations when the boat is in the position (3, 2):
Consider the following code:
C#
public class RecyclingBin
{
protected List<string> recyclables = new List<string>();
public void Add(string recyclable)
{
if (recyclable.Split(' ').Length > 1 && recyclable.Split(' ')[1].Length > 3)
{
recyclables.Add(recyclable);
}
}
public List<IGrouping<string, string>> SortRecyclables()
{
return recyclables.GroupBy(recyclable => recyclable.Split(' ').First()).ToList();
}
}
VB.NET
Public Class RecyclingBin
Protected recyclables As List(Of String) = New List(Of String)
Public Sub Add(recyclable As String)
If recyclable.Split(" ").Length > 1 And recyclable.Split(" ")[1].Length > 3
recyclables.Add(recyclable)
End If
End Sub
Public Function SortRecyclables()
Return recyclables.GroupBy(Function(recyclable) recyclable.Split(" ").First()).ToList()
End Function
End Class
Select the statements that are true if a new RecyclingBin is instantiated and the Add method is called with the following recyclable parameters: "metal pipe", "plastic toy", "metal bar", "copper wire", "plastic button", "wire", and "brass".
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81 more premium C# and .NET questions
Enum, NET Versions, Max Sum, Product Refactoring, Sort Params, Sum of Numbers, Delayed Print, Third Party Components, String Operations, Racer, Read First Line, Prefix, Chinese Box, Car Rental, Eye of the Storm, Document Store, Snapshot, Moving Total, Driver Exam, Classroom, Username, Weighted Average, Kilometer Converter, Document Counter, Disposable Wrapper, Platformer, String Occurrence, Hobbies, Language Teacher, Read Write Execute, Node, Friend, Internal Nodes, Crop Ratio, Unique Numbers, Wheel Defects, Log Parser, Shelf Test, Chain Link, Worker, Veterinarian, Window Manager, Ceramic Store, Stories, Paper Strip, Segment, Flight Connections, Nullable Employee, Vectors, Date Transform, Book Sale, Blog Posts, Construction Game, XML Navigation, Shipping, Memory Leak, Gearbox, Planet Search, Company Stock, Digital Flasks, Airport Networks, Patient Class, Patient Class, Unique Product, Ingredient Tuple, Stack to List, Log Patch, Circuit Simulator, Fire Dragon, Shining Star, Chemical Machine, Bicycle, Flimsy Ladder, Paragraph, Animal Hierarchy, Procedural Generator, String, Order Chars, Integer to Object, Citizen Income, Calories Burned.
Skills and topics tested
- .NET
- Enum
- CLR
- C#
- Algorithmic Thinking
- Accessibility Levels
- OOP
- Refactoring
- Pass by Reference
- LINQ
- Async-Await
- Multithreading
- Package Manager
- StringBuilder
- Synchronization
- Exceptions
- Data Structures
- Sorting
- Bug Fixing
- Language
- Lists
- HashSet
- Properties
- Regex
- Strings
- Arithmetic
- Inheritance
- Method Overriding
- Destructors
- Memory Management
- Linked List
- Stream
- Dictionary
- Iteration
- Recursion
- Tree
- Graphs
- Arrays
- Integer Division
- Serialization
- XML
- Test Case Design
- Unit Testing
- Queue
- Dynamic Programming
- Null Coalescing Operator
- Null Conditional Operator
- Eager Loading
- Entity Framework
- Lazy Loading
- Dynamic Objects
- Conditions
- AI Code Review
- Conditional Statements
- Loops
- 2D Array
- Abstract Class
- Tuples
- Complexity
- Stack
- Extension Methods
- Higher Order Function
- Interfaces
- TDD
- Field Modifiers
- Random
- Class Library
- Boxing and Unboxing
For job roles
- .NET Developer
- Back-End Developer
- C# Developer
- Web Developer
Sample candidate report
What others say
Simple, straight-forward technical testing
TestDome is simple, provides a reasonable (though not extensive) battery of tests to choose from, and doesn't take the candidate an inordinate amount of time. It also simulates working pressure with the time limits.
Jan Opperman, Grindrod Bank
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