[Part 2] If You Can Answer These 7 Questions Correctly, You’re a Decent Developer

Sukhpinder Singh - Sep 28 - - Dev Community

Hello .NET Enthusiasts,

Welcome to Part 2 of our C# knowledge test challenge! I would request you to check out Part 1 as well.
If You Can Answer These 7 Concepts Correctly, You’re Decent at .NET

This next set of questions will test your knowledge of advanced .NET concepts and practices.

1. Exploring Middleware in ASP.NET Core

The Middleware components of ASP.NET Core are the pieces that take part in the request and response pipeline. They provide an opportunity to insert custom logic, handle authentication, handle errors, etc.

Question: How to create and use a custom middleware component in ASP.NET Core? The steps to be done are to be described and illustrated by a simple example.

To implement a custom Middleware you need to write a class which contains an Invoke or InvokeAsync method, afterwards, you need to register this middleware in the Configure method of Startup.cs:

public class CustomMiddleware
{
    private readonly RequestDelegate _next;
    public CustomMiddleware(RequestDelegate next)
    {
        _next = next;
    }
    public async Task InvokeAsync(HttpContext context)
    {
        await context.Response.WriteAsync("Hello from custom middleware!");
        await _next(context);
    }
}
// In Startup.cs
public void Configure(IApplicationBuilder app)
{
    app.UseMiddleware<CustomMiddleware>();
    // Other middleware registrations
}
Enter fullscreen mode Exit fullscreen mode

The middleware can be used to do logging, authentication, etc.

2. Understanding Entity Framework Core Migrations

EF Core Migrations are pretty important in handling changes that come about over time in your database schema. They keep the current state of the data model of your application, together with the scheme of the database.

Question: How do you create and apply migrations in Entity Framework Core? What are the usual commands?

Use the following EF Core migration commands:

# Create a new migration
dotnet ef migrations add InitialCreate

# Apply the migration to the database
dotnet ef database update
Enter fullscreen mode Exit fullscreen mode

Example migration file:

public partial class InitialCreate : Migration
{
    protected override void Up(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.CreateTable(
            name: "Products",
            columns: table => new
            {
                Id = table.Column<int>(nullable: false)
                    .Annotation("SqlServer:Identity", "1, 1"),
                Name = table.Column<string>(nullable: true),
                Price = table.Column<decimal>(nullable: false)
            },
            constraints: table =>
            {
                table.PrimaryKey("PK_Products", x => x.Id);
            });
    }

    protected override void Down(MigrationBuilder migrationBuilder)
    {
        migrationBuilder.DropTable(
            name: "Products");
    }
}
Enter fullscreen mode Exit fullscreen mode

Migrations enable systematic database schema evolution.

3. Exploring LINQ Query Syntax vs. Method Syntax

LINQ provides two primary syntaxes for querying data: query syntax and method syntax. Both are powerful but have different use cases.

Question: What are the differences between LINQ query syntax and method syntax? Provide examples of each.

LINQ query syntax resembles SQL and is often used for simple queries:

var listOfInts = new List<int> { 23, 2, 3, 4, 54 }
              where n % 2 == 0
              select n;
Enter fullscreen mode Exit fullscreen mode

Method syntax uses lambda expressions and is more versatile for complex queries:

var listOfInts = new List<int> { 23, 2, 3, 4, 54 }
              .Where(n => n % 2 == 0);
Enter fullscreen mode Exit fullscreen mode

Both syntaxes are interchangeable but method syntax can be more flexible.

4. Understanding and Using Delegates and Events

Delegates and events are central to event-driven programming in .NET. They provide a way to define and handle notifications and callbacks.

Question: What are delegates and events in C#? Provide a simple example.

Define a delegate and use it to create events. Example:

public delegate void Notify(string message);

public class Notifier
{
    public Notify OnNotify;
    public void Trigger(string message)
    {
        OnNotify?.Invoke(message);
    }
}
// Usage
public class Program
{
    public static void Main()
    {
        Notifier notifier = new Notifier();
        notifier.OnNotify = message => Console.WriteLine("Notification: " + message);
        notifier.Trigger("Hello, world!"); // Outputs: Notification: Hello, world!
    }
}
Enter fullscreen mode Exit fullscreen mode

Delegates are used for method references and events are built on delegates.

5. Exploring .NET Core Performance Tuning

Optimizing .NET Core applications for performance involves various strategies, including profiling and improving resource management.

Question: What are some key techniques for performance tuning in .NET Core applications?

Techniques include:

  • Asynchronous I/O operations: Use async/await to keep the application responsive.

  • Optimize database access: Use efficient queries and caching strategies.

  • Profile and analyze: Utilize tools like dotnet-counters and dotnet-trace to monitor and diagnose performance issues.

Effective performance tuning ensures your application handles load efficiently.

6. Understanding Value Types vs. Reference Types

In .NET, understanding the difference between value types and reference types is fundamental for memory management and data manipulation.

Question: What are value and reference types in C#? Provide examples.

Value types hold data directly and are usually stack-allocated (e.g., int, float, struct). Reference types hold references to data and are heap-allocated (e.g., class, string).

Value Type Example:

int a = 10;
int b = a;
b++;
Console.WriteLine(a); // Outputs: 10
Enter fullscreen mode Exit fullscreen mode

Reference Type Example:

class Person
{
    public string Name { get; set; }
}

Person person1 = new Person { Name = "Alice" };
Person person2 = person1;
person2.Name = "Bob";
Console.WriteLine(person1.Name);
Enter fullscreen mode Exit fullscreen mode

7. Exploring .NET Core Configuration and Dependency Injection Integration

.NET Core integrates configuration management with dependency injection, allowing for efficient settings management.

Question: How do you use IOptions to manage configuration settings in .NET Core? Provide an example.

Use the IOptions interface to bind configuration settings to strongly typed classes.

Example Configuration File (appsettings.json):

{
  "MySettings": {
    "SomeSetting": "Value"
  }
}
Enter fullscreen mode Exit fullscreen mode

Settings Class:

public class MySettings
{
    public string SomeSetting { get; set; }
}
Enter fullscreen mode Exit fullscreen mode

Startup Configuration:

public void ConfigureServices(IServiceCollection services)
{
    services.Configure<MySettings>(Configuration.GetSection("MySettings"));
}
Enter fullscreen mode Exit fullscreen mode

Accessing Settings:

public class MyService
{
    private readonly MySettings _settings;
    public MyService(IOptions<MySettings> options)
    {
        _settings = options.Value;
    }
}
Enter fullscreen mode Exit fullscreen mode

This approach streamlines configuration management and integrates smoothly with dependency injection.

Access the complete series here

11 Key Design Patterns**
Unlock the secrets of software architecture with Mastering Software
Mastering .NET 8 Web API: From Setup to Security — A Comprehensive Guide for Developers

So, how did you do? Let me know in the comments

If you know the concept with confidence and understand the code examples, you’re likely well-versed in .NET.

Let’s keep the conversation going and help each other grow as .NET professionals.

Happy coding!

Image
20 Injury Compensation Websites Taking The Internet By Storm
Image
Some Of The Most Common Mistakes People Make With Asbestos Disease Mesothelioma
Image
Permainan Judi Online Amat Terkenal di Dunia
Image
Fitting a Cat Flap
Image
10 Asbestos Lawsuits Related Projects That Can Stretch Your Creativity
Image
slots online serta 2 cara untuk menang simpel.
Image
It's The Ugly Real Truth Of Couch
Image
10 Tips For Bunk Beds L Shaped That Are Unexpected
Image
Three Greatest Moments In Accident Claims Lawyers History
Image
7zip Optional Components: How They Enhance Your File Compression
Image
HAI
Image
The Origins of Salesforce: How One Idea Changed the CRM Landscape Forever

salesforceevolution, salesforceorigin
Image
Hollywood Icons as Disney Princesses? Mohammad Alothman Discusses AI’s Capabilities
Image
10 Best Facebook Pages That I've Ever Seen. How To Install A Ghost Immobiliser
Image
Tips Menang Taruhan Judi Online Dengan Cepat
Image
20 Trailblazers Lead The Way In Autowatch Ghost Installer
Image
apa yang beri keuntungan dari slots online?
Image
Managing Multiple Git Identities on Windows for Different Projects

git, pcsetup, developer, ssh
Image
11 Ways To Fully Redesign Your Accident Lawyer Dallas
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .