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.