Important C# 13 and .NET 9 Features

C# 13 and .NET 9 introduce several noteworthy features that enhance development efficiency and performance. Here’s a concise overview:

1. New Lock Object

The introduction of System.Threading.Lock provides a dedicated type for mutual exclusion, replacing the traditional use of object instances. This change leads to cleaner, more readable code and potential performance improvements. The Lock.EnterScope() method returns a ref struct that follows the Dispose pattern, allowing seamless use with the using statement.

2. Task.WhenEach

Handling multiple tasks that complete at different times becomes more efficient with Task.WhenEach. This method returns an IAsyncEnumerable<Task<TResult>>, enabling the use of await foreach to process tasks as they finish, simplifying asynchronous programming patterns.

3. params Collections

C# 13 expands the params keyword to support various collection types, including Span<> and IEnumerable<>. This enhancement reduces the need for explicit conversions like .ToArray() or .ToList(), leading to cleaner code and improved performance through efficient memory usage and lazy execution.

4. Semi-Auto Properties

The new field keyword allows direct access to a property’s backing field without manual definition. This feature reduces boilerplate code, enhances readability, and confines the backing field to the property scope, improving encapsulation and reducing errors.

5. Hybrid Cache

The HybridCache API combines the benefits of in-memory (IMemoryCache) and distributed caching (IDistributedCache). It offers a unified API for both, providing fast local access to frequently used data and scalable external storage for larger datasets. Additionally, it addresses issues like the cache stampede problem, making caching more flexible and performant.

6. Built-in OpenAPI Document Generation

.NET 9 introduces Microsoft.AspNetCore.OpenApi, an internally developed package that replaces Swashbuckle.AspNetCore for OpenAPI document generation. This integration simplifies the process of creating standardized API documentation, enhancing the development and consumption of APIs.

These advancements in C# 13 and .NET 9 demonstrate a commitment to improving developer experience, code quality, and application performance.

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