How Can I Get a Thread's ID in C#?

Retrieving Thread Identifiers in C#

When debugging threads, Visual Studio displays unique IDs for each thread. However, programmers often seek to retrieve these IDs programmatically for various purposes.

Thread ID Acquisition

To obtain the ID of a native thread, utilize the GetThreadId function, which accepts a thread handle as an argument. To acquire the thread handle for a managed thread, additional steps may be necessary.

Alternatively, for managed threads, System.Environment.CurrentManagedThreadId provides the unique identifier for the current thread.

Additional Options

While System.Environment.CurrentManagedThreadId is preferred, legacy options are also available:

• GetCurrentThreadId: Returns the ID of the current thread (deprecated in .NET 2.0)
• Thread.CurrentThread.ManagedThreadId: Provides the unique identifier for the current managed thread, similar to System.Environment.CurrentManagedThreadId (preferred in CA1840)

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