Best 9 C# .NET Libraries You Must Know
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?As a .NET developer, leveraging the right libraries can significantly enhance your productivity, code quality, and performance. Here’s a comprehensive guide to nine essential C .NET libraries that you must know.
?
?1. ??Newtonsoft.Json (Json.NET)?
? Description:?
A popular high-performance JSON framework for .NET, known for its ease of use and flexibility.
?? Key Features:?
- Serialize and deserialize JSON
- LINQ to JSON for manipulating JSON data
- Support for various data types and configurations
?
? Example:?
using Newtonsoft.Json;
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
}
var product = new Product { Id = 1, Name = "Laptop" };
string json = JsonConvert.SerializeObject(product);
Product deserializedProduct = JsonConvert.DeserializeObject<Product>(json);?
? Use Cases:?
- Web APIs
- Configuration management
- Data exchange?
?2. ??Entity Framework Core?
? Description:?
A modern object-database mapper (ORM) for .NET, enabling developers to work with a database using .NET objects.?
? Key Features:?
- LINQ queries
- Change tracking
- Migrations for database updates?
? Example:?
using Microsoft.EntityFrameworkCore;
public class ProductContext : DbContext
{
public DbSet<Product> Products { get; set; }
}
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
}?
? Use Cases:?
- Data access layer in web applications
- Desktop applications
- Services?
?3. ??AutoMapper?
? Description:?
A convention-based object-to-object mapper, useful for transforming objects.
?? Key Features:?
- Easy to configure and use
- Supports complex mappings
- Custom value resolvers and type converters
?? Example:?
using AutoMapper;
public class Product
{
public int Id { get; set; }
public string Name { get; set; }
}
public class ProductDTO
{
public int Id { get; set; }
public string Name { get; set; }
}
var config = new MapperConfiguration(cfg => cfg.CreateMap<Product, ProductDTO>());
var mapper = new Mapper(config);
ProductDTO productDto = mapper.Map<ProductDTO>(new Product { Id = 1, Name = "Laptop" });?
? Use Cases:?
- Data transfer objects (DTOs)
- View models
- Service layer transformations
?4. ??Dapper?
? Description:?
A lightweight and fast micro ORM for .NET, primarily used for data access.
?? Key Features:?
- Simple to use
- High performance
- Compatible with any database provider
?? Example:?
using Dapper;
using System.Data.SqlClient;
var connectionString = "YourConnectionString";
using (var connection = new SqlConnection(connectionString))
{
string sql = "SELECT FROM Products";
var products = connection.Query<Product>(sql).ToList();
}?
? Use Cases:?
- Performance-critical data access
- Simple CRUD operations
- Data-intensive applications
??5. ??Serilog?
? Description:?
A diagnostic logging library for .NET, known for its powerful and flexible configuration options.
?? Key Features:?
- Structured logging
- Multiple sinks (e.g., file, console, databases)
- Enrich log data with additional context
?? Example:?
using Serilog;
Log.Logger = new LoggerConfiguration()
.WriteTo.Console()
.WriteTo.File("logs/log.txt", rollingInterval: RollingInterval.Day)
.CreateLogger();
Log.Information("Hello, Serilog!");
Log.CloseAndFlush();?
? Use Cases:?
- Application logging
领英推荐
- Debugging and diagnostics
- Monitoring
??6. ??Polly?
? Description:?
A resilience and transient fault handling library that allows developers to express policies such as Retry, Circuit Breaker, Timeout, Bulkhead Isolation, and Fallback.
? Key Features:?
- Fluent and thread-safe API
- Asynchronous support
- Integration with .NET HTTP client
?? Example:?
using Polly;
var retryPolicy = Policy
.Handle<Exception>()
.Retry(3, onRetry: (exception, retryCount) =>
{
Console.WriteLine($"Retry {retryCount} due to {exception.Message}");
});
retryPolicy.Execute(() =>
{
// Your code that might fail
});?
? Use Cases:?
- Network calls
- API integration
- Service communication
?
?7. ??Moq?
? Description:?
A mocking library for .NET that simplifies the creation of mock objects for unit testing.
?
? Key Features:?
- Intuitive and fluent API
- Supports LINQ expressions
- Strongly-typed mocking
?
? Example:?
using Moq;
var mock = new Mock<IProductService>();
mock.Setup(service => service.GetProduct(It.IsAny<int>())).Returns(new Product { Id = 1, Name = "Laptop" });
var productService = mock.Object;
var product = productService.GetProduct(1);?
? Use Cases:?
- Unit testing
- Test-driven development (TDD)
- Isolating dependencies
?
?8. ??FluentValidation?
? Description:?
A popular validation library for .NET, providing a fluent interface for defining validation rules.
?
? Key Features:?
- Fluent API
- Integration with ASP.NET Core
- Custom validators
?
? Example:?
using FluentValidation;
public class ProductValidator : AbstractValidator<Product>
{
public ProductValidator()
{
RuleFor(product => product.Name).NotEmpty().WithMessage("Product name is required.");
RuleFor(product => product.Price).GreaterThan(0).WithMessage("Price must be greater than zero.");
}
}
? Use Cases:?
- Input validation
- Business rules enforcement
- Data integrity
?
?9. ??NUnit?
? Description:?
A widely-used unit testing framework for .NET.
?
? Key Features:?
- Rich set of assertions
- Data-driven tests
- Extensibility
?
? Example:?
using NUnit.Framework;
[TestFixture]
public class ProductTests
{
[Test]
public void ProductName_ShouldNotBeEmpty()
{
var product = new Product { Name = "" };
var validator = new ProductValidator();
var result = validator.Validate(product);
Assert.IsFalse(result.IsValid);
}?
? Use Cases:?
- Unit testing
- Integration testing
- Test automation
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