How Can I Programmatically Retrieve Thread IDs in C#?

Retrieving Thread IDs in C#

When debugging in C#, Visual Studio displays the ID of each thread. However, developers may wish to programmatically access this information.

Managed Threads

For managed threads, the System.Environment.CurrentManagedThreadId property provides the ID of the current thread. Alternatively, Thread.CurrentThread.ManagedThreadId serves the same purpose.

Native Threads

Visual Studio obtains the ID of native threads through the GetThreadId function. To retrieve the handle of a specific thread, use the following code:

// Code for retrieving a thread handle with a specific ID
if (IntPtr.Size == 4)
{
    // 32-bit process
    ThreadHandle threadHandle = Win32.OpenThread(ThreadAccess.READ_CONTROL, false, threadId);
}
else
{
    // 64-bit process
    ThreadHandle threadHandle = Win32.OpenThread(ThreadAccess.READ_CONTROL, false, threadId.ToInt64());
}

Deprecated Options for Managed Threads

Older SDKs also offered deprecated options for retrieving the ID of the current managed thread:

• System.Threading.GetCurrentThreadId (deprecated as of .NET 2.0)
• Thread.CurrentThread.ManagedThreadId (preferred usage is System.Environment.CurrentManagedThreadId)

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