With .𝗡𝗘𝗧 𝟵 on the horizon, a range of exciting updates are coming to improve performance and code clarity. Among the highlights in 𝗖# 𝟭𝟯 is the new System.Threading.𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁, designed to make multi-threaded applications safer and more efficient.

🔑 𝟭. 𝗡𝗲𝘄 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁

Historically, the 𝗢𝗯𝗷𝗲𝗰𝘁 type was used for locking, but C# 13 introduces a specialized 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁, making code more readable and efficient.

𝗕𝗲𝗻𝗲𝗳𝗶𝘁𝘀 𝗼𝗳 𝘁𝗵𝗲 𝗡𝗲𝘄 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁:

• 𝗖𝗹𝗲𝗮𝗻𝗲𝗿 & 𝗦𝗮𝗳𝗲𝗿 𝗖𝗼𝗱𝗲: The 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁 clarifies the intent, with compiler warnings if misused.
• 𝗕𝗲𝘁𝘁𝗲𝗿 𝗣𝗲𝗿𝗳𝗼𝗿𝗺𝗮𝗻𝗰𝗲: Locking on a 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁 can be more efficient than locking on a generic 𝗢𝗯𝗷𝗲𝗰𝘁 instance.
• 𝗡𝗲𝘄 𝗠𝗲𝗰𝗵𝗮𝗻𝗶𝘀𝗺 𝘄𝗶𝘁𝗵 𝗘𝗻𝘁𝗲𝗿𝗦𝗰𝗼𝗽𝗲: Replacing Monitor, EnterScope provides a ref struct with Dispose support, making it compatible with using blocks.

🔶 𝟮. 𝗟𝗶𝗺𝗶𝘁𝗮𝘁𝗶𝗼𝗻𝘀 𝘄𝗶𝘁𝗵 𝗔𝘀𝘆𝗻𝗰 𝗖𝗼𝗱𝗲

While 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁 improves synchronous operations, 𝗮𝘀𝘆𝗻𝗰 𝗰𝗮𝗹𝗹𝘀 𝗮𝗿𝗲 𝘀𝘁𝗶𝗹𝗹 𝗻𝗼𝘁 𝗮𝗹𝗹𝗼𝘄𝗲𝗱 within lock blocks due to threading limitations. To handle async scenarios, 𝗦𝗲𝗺𝗮𝗽𝗵𝗼𝗿𝗲𝗦𝗹𝗶𝗺 remains the preferred solution.

🎯 𝗞𝗲𝘆 𝗧𝗮𝗸𝗲𝗮𝘄𝗮𝘆𝘀:

• 𝗡𝗲𝘄 𝗟𝗼𝗰𝗸 𝗢𝗯𝗷𝗲𝗰𝘁: Improves readability and performance in .NET 9.
• 𝗦𝗰𝗼𝗽𝗲 𝗟𝗶𝗺𝗶𝘁𝗮𝘁𝗶𝗼𝗻𝘀: async operations aren’t compatible within lock blocks.
• 𝗔𝘀𝘆𝗻𝗰 𝗔𝗹𝘁𝗲𝗿𝗻𝗮𝘁𝗶𝘃𝗲: Use SemaphoreSlim for asynchronous code that requires mutual exclusion.

.NET 9 and C# 13 bring these updates to streamline threading and enhance locking efficiency in C# applications.

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