A Comprehensive Guide to Entity Framework Core in .NET 8

// Example: Creating a DemoDbContext class the file is kept in DbContext Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data

using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data;
public class DemoDbContext: DbContext
{
    public DemoDbContext(DbContextOptions options) : base(options)
    {
    }

    public DbSet<User> Users { get; set; }
    // Other DbSet properties for additional entities

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("OurConnectionString");
    }

}

// Example: Creating a UserRepository class the file is kept in Repository Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Interfaces;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data.Repository;
public class UserRepository : IUserRepository
{
    private readonly DemoDbContext _dbContext;
    private bool _disposed = false;

    public UserRepository(DemoDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    /// <summary>
    /// This is an Example Querying data with LINQ
    /// </summary>
    /// <returns>List</returns>
    public Task<List<User>> GetAllActiveUsersAsync() =>
      _dbContext.Users
          .Where(u => u.IsActive)
          .OrderBy(u => u.LastName)
          .ThenBy(u => u.FirstName)
          .ToListAsync();


    protected virtual void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        if (disposing)
        {
            _dbContext.Dispose();
        }

        _disposed = true;
    }


    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

dotnet ef migrations add InitialCreate

dotnet ef database update

// Example: Creating a UserRepository class the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Domain
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record Order
{
    [Key]
    public Guid Id { get; init; }

    public Guid UserId { get; init; }

    [ForeignKey("UserId")]
    public required User User { get; init; }

    [Required]
    public string ProductName { get; init; }=string.Empty;

    [Required,Range(0, double.MaxValue, ErrorMessage = "Price must be a positive value.")]
    public decimal Price { get; init; }

    [Required]
    public DateTime OrderDate { get; init; }
        
}

// Example: Creating a UserRepository class the file is kept in Repository Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Interfaces;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data.Repository;
public class UserRepository : IUserRepository
{
    private readonly DemoDbContext _dbContext;
    private bool _disposed = false;

    public UserRepository(DemoDbContext dbContext)
    {
        _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
    }

    /// <summary>
    /// This is an Example Querying data with LINQ
    /// </summary>
    /// <returns>List</returns>
    public Task<List<User>> GetAllActiveUsersAsync() =>
      _dbContext.Users
          .Where(u => u.IsActive)
          .OrderBy(u => u.LastName)
          .ThenBy(u => u.FirstName)
          .ToListAsync();


    /// <summary>
    /// This example is  Eager loading in EF Core
    /// </summary>
    /// <returns></returns>
    public Task<List<User>> LoadUsersWithOrdersAsync() =>
     _dbContext.Users
        .Include(u=>u.Orders)
         .Where(u => u.IsActive)
         .OrderBy(u => u.LastName)
         .ThenBy(u => u.FirstName)
         .ToListAsync();

    protected virtual void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        if (disposing)
        {
            _dbContext.Dispose();
        }

        _disposed = true;
    }


    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

// Example: is using Program.cs  file is kept in  Project EntityFrameworkCoreGuideNET8.Business.UI, which is ASP.net Core MVC Project
using EntityFrameworkCoreGuideNET8.Business.UI.Extensions;

var builder = WebApplication.CreateBuilder(args);

// Add services to the container.
builder.Services.AddControllersWithViews();

// Example: Configuring authentication and authorization in ASP.NET Core
builder.Services.AddJwtAuthentication(builder.Configuration);

builder.Services.AddAdminAuthorization();


var app = builder.Build();

// Configure the HTTP request pipeline.
if (!app.Environment.IsDevelopment())
{
    app.UseExceptionHandler("/Home/Error");
    // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
    app.UseHsts();
}

app.UseHttpsRedirection();
app.UseStaticFiles();

app.UseRouting();

app.UseAuthorization();

app.MapControllerRoute(
    name: "default",
    pattern: "{controller=Home}/{action=Index}/{id?}");

app.Run();

// Example: Creating a JwtAuthentication.cs class the file is kept in Extensions Folder in Project EntityFrameworkCoreGuideNET8.Business.UI

using Microsoft.AspNetCore.Authentication.JwtBearer;
using Microsoft.IdentityModel.Tokens;
using System.Text;

namespace EntityFrameworkCoreGuideNET8.Business.UI.Extensions;
public static  class JwtAuthentication
{
    public static void AddJwtAuthentication(this IServiceCollection services, IConfiguration configuration)
    {
        // Example: Configuring authentication and authorization in ASP.NET Core
        services.AddAuthentication(JwtBearerDefaults.AuthenticationScheme)
            .AddJwtBearer(options =>
            {
                options.TokenValidationParameters = new TokenValidationParameters
                {
                    ValidateIssuer = true,
                    ValidateAudience = true,
                    ValidateLifetime = true,
                    ValidateIssuerSigningKey = true,
                    ValidIssuer = configuration["Jwt:Issuer"],
                    ValidAudience = configuration["Jwt:Audience"],
                    IssuerSigningKey = new SymmetricSecurityKey(Encoding.UTF8.GetBytes(configuration["Jwt:Key"]))
                };
            });


    }
}

// Example: Creating a Authorization.cs class the file is kept in Extensions Folder in Project EntityFrameworkCoreGuideNET8.Business.UI
namespace EntityFrameworkCoreGuideNET8.Business.UI.Extensions;
public static class Authorization
{
    public static void AddAdminAuthorization(this IServiceCollection services)
    {
        services.AddAuthorization(options =>
        {
            options.AddPolicy("AdminOnly", policy =>
            {
                policy.RequireRole("Admin");
            });
        });
    }
}

// Example: Using record types for entity classes
public record User
{
    public int Id { get; init; }
    public string FirstName { get; init; }
    public string LastName { get; init; }
}

Entity Framework Core Performance Optimization

Entity Framework Core (EF Core) applications must understand performance optimization techniques to ensure efficient database operations. By optimizing database operations, developers can significantly enhance the performance and responsiveness of their applications, resulting in a better user experience and increased scalability.

To optimize query execution, database indexes help provide a quick way to locate specific rows in a database table, which speeds up query execution. By creating indexes on frequently queried columns, developers can reduce the time it takes to retrieve data from the database, resulting in faster query performance.

The performance of queries can also be significantly improved by optimizing them. By carefully crafting queries, developers can minimize the amount of data retrieved from the database and maximize the use of indexes. Several techniques can be used to improve query performance, including avoiding unnecessary joins, selecting only the necessary columns, and filtering data with WHERE clauses.

By caching frequently accessed data in memory, developers can reduce the number of database queries and improve application responsiveness, which can also be essential to performance optimization. The use of in-memory caching frameworks like Redis or the implementation of distributed caching solutions can help minimize database load and improve application performance.

To effectively optimize performance, developers must also monitor and analyse performance metrics to identify bottlenecks and areas for improvement. Developers can pinpoint performance issues and take corrective action with tools like Entity Framework Profiler or SQL Server Management Studio that provide insights into query execution times, database load, and resource utilization.

// Example: Creating a DemoDbContext class the file is kept in DbContext Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data

using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data;
public class DemoDbContext: DbContext
{
    
    public DemoDbContext(DbContextOptions options) : base(options)
    {
    
    }

    public DbSet<User> Users { get; set; }
    // Other DbSet properties for additional entities

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("OurConnectionString");
    }

    // Example: Creating a database index in EF Core
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<User>()
            .HasIndex(u => u.Email)
            .IsUnique();
    }

}

We developer can improve the performance of their EF Core applications by using performance optimization techniques like database indexes, optimizing queries, implementing caching strategies, and monitoring performance metrics. By combining these techniques with careful analysis and tuning, significant performance improvements and a better user experience can be achieved.

Testing Entity Framework Core Applications

Tests are crucial to the reliability and maintainability of Entity Framework Core (EF Core) applications. By thoroughly testing our codebase, you can reduce the risk of bugs and errors in production environments by identifying and addressing potential issues early in the development lifecycle.

Different types of testing methodologies, such as unit testing, integration testing, and mocking frameworks, can be used to test EF Core applications. Testing individual components and units of code in isolation is referred to as unit testing. In contrast, integration testing involves ensuring that different components or modules work smoothly together.

As a way to test database interactions in EF Core applications, developers often use mocking frameworks to simulate database behavior without actually hitting the database. You can isolate our tests without relying on external dependencies by creating mock objects that mimic the behavior of real database objects using mocking frameworks.

Setting up in-memory databases or using mocking libraries are also useful techniques for testing EF Core applications. With in-memory databases, you are able to run tests against a temporary database that exists only in memory, providing a lightweight and fast alternative to traditional database systems. By creating mock objects for database operations, mocking libraries eliminate the need to interact with a physical database during testing.

The reliability and maintainability of our EF Core applications can be greatly improved by implementing testing strategies such as unit testing, integration testing, mocking frameworks, and in-memory databases or mocking libraries. Our software will perform at its best if you invest time and effort into testing.

//DbContextMocker.cs class the file is kept in   Project EntityFrameworkCoreGuideNET8.Tests
using EntityFrameworkCoreGuideNET8.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Tests;
public static class DbContextMocker
{
    public static DemoDbContext GetDemoDbContext(string dbName)
    {
        var options = new DbContextOptionsBuilder<DemoDbContext>()
            .UseInMemoryDatabase(databaseName: dbName)
            .Options;

        var dbContext = new DemoDbContext(options);

        // Seed your in-memory database with test data if needed

        return dbContext;
    }
}

//UserRepositoryTests.cs class the file is kept in   Project EntityFrameworkCoreGuideNET8.Tests
using EntityFrameworkCoreGuideNET8.Infrastructure.Data.Repository;

namespace EntityFrameworkCoreGuideNET8.Tests;

public class UserRepositoryTests
{
    // Example: Writing unit tests for EF Core repositories

    [Fact]
    public async Task GetUsers_ReturnsAllUsers()
    {
        // Arrange
        var dbContext = DbContextMocker.GetDemoDbContext(nameof(GetUsers_ReturnsAllUsers));
        var repository = new UserRepository(dbContext);

        // Act
        var users = await repository.GetAllActiveUsersAsync();

        // Assert
        Assert.Equal(3, users.Count);
    }

}

Entity Framework Core Best Practices

Maintain Code Quality and Consistency

Maintaining code quality and consistency is essential when working with Entity Framework Core (EF Core) to ensure robust and maintainable applications. By adhering to recommended best practices and conventions, developers can streamline development, improve code readability, and minimize potential issues. Let's explore some of these best practices.

// Example: Creating a DemoDbContext class the file is kept in DbContext Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data

using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data;
public class DemoDbContext: DbContext
{
    
    public DemoDbContext(DbContextOptions options) : base(options)
    {
    
    }

    public DbSet<User> Users { get; set; }
    // Other DbSet properties for additional entities

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("OurConnectionString");
    }

    // Example: Creating a database index in EF Core
    protected override void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder.Entity<User>()
            .HasIndex(u => u.Email)
            .IsUnique();

        // Fluent API configurations
        modelBuilder.Entity<User>()
            .Property(e => e.Id)
            .IsRequired();

    }

}

using EntityFrameworkCoreGuideNET8.Infrastructure.Data;
using Microsoft.EntityFrameworkCore;

Console.WriteLine("Hello, from Ziggy Rafiq!");



using (var context = new DemoDbContext(new DbContextOptionsBuilder<DemoDbContext>()
    .UseSqlServer("our_connection_string_here").Options))
{
    // Use context to interact with the database
}

Use meaningful naming conventions

Choose descriptive names for entities, properties, and methods to enhance code readability and understanding.

// Example: Creating a User record the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using System.ComponentModel.DataAnnotations;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record User
{
    [Key]
    public Guid Id { get; init; }

    public List<Order> Orders { get; init; } = new List<Order>();

    [Required]
    public string FirstName { get; init; } = string.Empty;

    [Required]
    public string LastName { get; init; } = string.Empty;

    [Required]
    public string Email { get; init; } = string.Empty;

    [Required]
    public string EmailConfirmed { get; init; } = string.Empty;

    [Required]
    public string Phone { get; init; } = string.Empty;

    [Required]
    public string PhoneConfirmed { get; init; } = string.Empty;

    public bool IsActive { get; init; } = false;

    [Timestamp]
    public byte[]? RowVersion { get; set; }
}

Keep DbContext lean and focused

Avoid cluttering the DbContext class with unnecessary configurations or dependencies. Keep it focused on defining entities and their relationships.

// Example: Creating a DemoDbContext class the file is kept in DbContext Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data

using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data;
public class DemoDbContext: DbContext
{
    
    public DemoDbContext(DbContextOptions options) : base(options)
    {
    
    }

    public DbSet<User> Users { get; set; }
    // Other DbSet properties for additional entities

    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder.UseSqlServer("OurConnectionString");
    }
 

}

Use Data Annotations or Fluent API

Choose either Data Annotations or Fluent API consistently for configuring entities and relationships. Prefer Fluent API for more complex configurations.

// Example: Creating a User record the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using System.ComponentModel.DataAnnotations;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record User
{
    [Key]
    public Guid Id { get; init; }

    public List<Order> Orders { get; init; } = new List<Order>();

    [Required]
    public string FirstName { get; init; } = string.Empty;

    [Required]
    public string LastName { get; init; } = string.Empty;

    [Required]
    public string Email { get; init; } = string.Empty;

    [Required]
    public string EmailConfirmed { get; init; } = string.Empty;

    [Required]
    public string Phone { get; init; } = string.Empty;

    [Required]
    public string PhoneConfirmed { get; init; } = string.Empty;

    public bool IsActive { get; init; } = false;

    [Timestamp]
    public byte[]? RowVersion { get; set; }
}

// Example: Creating a UserRepository class the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Domain
using System.ComponentModel.DataAnnotations;
using System.ComponentModel.DataAnnotations.Schema;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record Order
{
    [Key]
    public Guid Id { get; init; }

    public Guid UserId { get; init; }

    [ForeignKey("UserId")]
    public required User User { get; init; }

    [Required]
    public string ProductName { get; init; }=string.Empty;

    [Required,Range(0, double.MaxValue, ErrorMessage = "Price must be a positive value.")]
    public decimal Price { get; init; }

    [Required]
    public DateTime OrderDate { get; init; }
        
}

Handle concurrency with timestamps

Use timestamps (e.g., RowVersion) to handle concurrency conflicts when multiple users update the same entity simultaneously.

// Example: Creating a User record the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using System.ComponentModel.DataAnnotations;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record User
{
    [Key]
    public Guid Id { get; init; }

    public List<Order> Orders { get; init; } = new List<Order>();

    [Required]
    public string FirstName { get; init; } = string.Empty;

    [Required]
    public string LastName { get; init; } = string.Empty;

    [Required]
    public string Email { get; init; } = string.Empty;

    [Required]
    public string EmailConfirmed { get; init; } = string.Empty;

    [Required]
    public string Phone { get; init; } = string.Empty;

    [Required]
    public string PhoneConfirmed { get; init; } = string.Empty;

    public bool IsActive { get; init; } = false;

    [Timestamp]
    public byte[]? RowVersion { get; set; }
}

Optimize database interactions

Minimize database roundtrips by using eager loading, explicit loading, or lazy loading appropriately. Avoid N+1 query issues by eagerly loading related entities when needed.

// Eager loading example
var users = dbContext.Users.Include(u => u.Orders).ToList();

Handle exceptions gracefully

Implement error handling mechanisms to handle exceptions thrown by EF Core operations gracefully. Use try-catch blocks to catch specific exceptions and provide meaningful error messages to users.

// Example: Creating a UserRepository class the file is kept in Repository Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.DTOs;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Interfaces;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data.Repository;
public class UserRepository : IUserRepository
{
    private readonly DemoDbContext _dbContext;
    private bool _disposed = false;

    public UserRepository(DemoDbContext dbContext)
    {
        _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
    }

  

 

    /// <summary>
    /// Add or Updates the User
    /// </summary>
    /// <param name="user">User Model</param>
    /// <returns></returns>
    public async Task SaveAsync(User user)
    {
        try
        {
            _dbContext.Entry(user).State = user.Id == Guid.Empty ? EntityState.Added : EntityState.Modified;

            await _dbContext.SaveChangesAsync();
        }
        catch (DbUpdateException ex)
        {
            Console.WriteLine("An error occurred while saving changes to the database: " + ex.Message);
        }
    }

    protected virtual void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        if (disposing)
        {
            _dbContext.Dispose();
        }

        _disposed = true;
    }


    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

By following these best practices and conventions, developers can maintain code quality, consistency, and reliability when working with Entity Framework Core. These practices contribute to building scalable, maintainable, and efficient applications in the .NET ecosystem.

Use DTOs (Data Transfer Objects)

When working with Entity Framework Core (EF Core) in ASP.NET Core applications, utilizing Data Transfer Objects (DTOs) for projection offers numerous benefits, including improved performance, reduced data transfer, and enhanced security. Additionally, avoiding direct usage of DbSet in controllers helps maintain the separation of concerns and promotes cleaner, more maintainable code. Let's delve into best practices for implementing DTOs and avoiding direct DbSet usage in controllers:

Implement DTOs for projection

Create DTO classes tailored to specific use cases to transfer data between our application layers. DTOs allow you to shape the data returned from EF Core queries precisely as needed by the client without exposing our domain entities directly.

// DTOs.cs file  in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.DTOs;
public record UserDto(Guid Id, string FirstName, string LastName, string Email, string Phone, bool IsActive);


public record OrderDto(Guid Id, Guid UserId, string ProductName, decimal Price, DateTime OrderDate);

Use projection to populate DTOs

When querying data from EF Core, use projection to map the query results directly to DTOs. This approach reduces the amount of data transferred over the network and improves performance by fetching only the required fields.

// Example: Creating a UserRepository class the file is kept in Repository Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.DTOs;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Interfaces;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
using Microsoft.EntityFrameworkCore;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Data.Repository;
public class UserRepository : IUserRepository
{
    private readonly DemoDbContext _dbContext;
    private bool _disposed = false;

    public UserRepository(DemoDbContext dbContext)
    {
        _dbContext = dbContext ?? throw new ArgumentNullException(nameof(dbContext));
    }

    /// <summary>
    /// This example demonstrates the usage of UserDto for accessing the data.
    /// </summary>
    /// <returns>List of Users</returns>
    public Task<List<UserDto>> GetUserDtosAsync() => _dbContext.Users
      .Select(u => new UserDto(
          u.Id,
          u.FirstName,
          u.LastName,
          u.Email,
          u.Phone,
          u.IsActive
      ))
      .ToListAsync();


    

    protected virtual void Dispose(bool disposing)
    {
        if (_disposed)
            return;

        if (disposing)
        {
            _dbContext.Dispose();
        }

        _disposed = true;
    }


    public void Dispose()
    {
        Dispose(true);
        GC.SuppressFinalize(this);
    }
}

Avoid using DbSet directly in controllers

Instead of returning DbSet directly from controllers, project the data into DTOs to ensure that only necessary data is exposed to clients. This approach helps prevent over-fetching of data and minimizes potential security risks associated with exposing domain entities.

[ApiController]
[Route("api/users")]
public class UserController : ControllerBase
{
    private readonly MyDbContext _dbContext;

    public UserController(MyDbContext dbContext)
    {
        _dbContext = dbContext;
    }

    [HttpGet]
    public ActionResult<IEnumerable<UserDto>> GetUsers()
    {
        var userDtos = _dbContext.Users
            .Select(u => new UserDto
            {
                UserId = u.UserId,
                UserName = u.UserName,
                // Map other properties as needed...
            })
            .ToList();

        return Ok(userDtos);
    }
}

By utilizing DTOs for projection and avoiding direct usage of DbSet in controllers, developers can design more efficient, secure, and maintainable ASP.NET Core applications. This approach facilitates better separation of concerns, enhances performance, and improves overall code quality.

Ensure concurrency conflicts are handled gracefully

Ensuring concurrency conflicts are handled gracefully, implementing logging and error handling, and regularly updating EF Core and its dependencies are crucial practices for maintaining the reliability, security, and performance of ASP.NET Core applications. Let's explore these best practices in detail:

Handle concurrency conflicts gracefully

When multiple users attempt to modify the same data simultaneously, concurrency conflicts can occur. EF Core provides mechanisms to detect and resolve these conflicts, such as using timestamps or row versioning. Implement appropriate concurrency control strategies to handle conflicts and ensure data integrity.

// Example: Creating a User record the file is kept in Models Folder in Project EntityFrameworkCoreGuideNET8.Infrastructure.Data
using System.ComponentModel.DataAnnotations;

namespace EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Models;
public record User
{
    [Key]
    public Guid Id { get; init; }

    public List<Order> Orders { get; init; } = new List<Order>();

    [Required]
    public string FirstName { get; init; } = string.Empty;

    [Required]
    public string LastName { get; init; } = string.Empty;

    [Required]
    public string Email { get; init; } = string.Empty;

    [Required]
    public string EmailConfirmed { get; init; } = string.Empty;

    [Required]
    public string Phone { get; init; } = string.Empty;

    [Required]
    public string PhoneConfirmed { get; init; } = string.Empty;

    public bool IsActive { get; init; } = false;

    [Timestamp]
    public byte[]? RowVersion { get; set; }
}

Implement logging and error handling

Logging and error handling are essential for identifying and diagnosing issues in production environments. Use logging frameworks like Serilog or NLog to record application events, errors, and warnings. Implement structured logging to capture relevant information for troubleshooting.

using EntityFrameworkCoreGuideNET8.Business.UI.Models;
using EntityFrameworkCoreGuideNET8.Infrastructure.Domain.Interfaces;
using Microsoft.AspNetCore.Mvc;
using System.Diagnostics;

namespace EntityFrameworkCoreGuideNET8.Business.UI.Controllers
{
    public class HomeController : Controller
    {
        private readonly ILogger<HomeController> _logger;
        private readonly IUserService _userService;

        public HomeController(ILogger<HomeController> logger, IUserService userService)
        {
            _logger = logger;
            _userService = userService;
        }

        public IActionResult Index()
        {
            return View();
        }

        public IActionResult Privacy()
        {
            return View();
        }

        [HttpGet]
        public async Task<IActionResult> GetAllActiveUser()
        {
            try
            {
                var user = await _userService.GetAllActiveUsersAsync();
                if (user == null)
                {
                    return NotFound();
                }
                return Ok(user);
            }
            catch (Exception ex)
            {
                _logger.LogError(ex, "An error occurred while retrieving the user.");
                return StatusCode(500, "An unexpected error occurred.");
            }
        }


        [ResponseCache(Duration = 0, Location = ResponseCacheLocation.None, NoStore = true)]
        public IActionResult Error()
        {
            return View(new ErrorViewModel { RequestId = Activity.Current?.Id ?? HttpContext.TraceIdentifier });
        }
    }
}

Regularly update EF Core and dependencies

EF Core releases updates periodically to introduce new features, enhancements, and bug fixes. Stay up-to-date with the latest EF Core versions and regularly update our project's dependencies to leverage improvements and security patches.

dotnet add package Microsoft.EntityFrameworkCore --version x.x.x

By adhering to these best practices, developers can enhance the reliability, security, and performance of their ASP.NET Core applications. Handling concurrency conflicts gracefully, implementing robust logging and error handling, and keeping EF Core and dependencies updated are critical steps in ensuring the long-term success of our application.

Summary

A cornerstone of modern .NET development, Entity Framework Core provides robust data access solutions. By using the latest features from C# 10 and .NET 8, developers can improve database interactions, boost performance, and increase productivity. By reading this comprehensive guide, you will be able to use Entity Framework Core to its fullest extent. You'll ensure the scalability, reliability, and maintainability of our .NET applications by mastering these concepts, techniques, and best practices.

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