thread-abort-migration

Replace Thread.Abort with cooperative cancellation using CancellationToken. Pass a CancellationToken into the worker method, check it with token.ThrowIfCancellationRequested() at safe checkpoints, and call CancellationTokenSource.Cancel() instead of Abort().

The exception occurs because Thread.Abort is unsupported in modern .NET. Inventory all Thread.Abort, ThreadAbortException, and Thread.ResetAbort call sites, classify each by intent, and migrate them to CancellationToken-based patterns, then verify the build has no SYSLIB0006 warnings.

Replace catch (ThreadAbortException) with catch (OperationCanceledException). Move critical cleanup logic into finally blocks or CancellationToken.Register callbacks, and let OperationCanceledException propagate rather than swallowing it.

No. The true endResponse parameter internally calls Thread.Abort in classic ASP.NET. In ASP.NET Core, call Response.Redirect(url) without the parameter or return a redirect result, and use HttpContext.RequestAborted as the cancellation token for long-running request work.

No migration is needed if the code only uses Thread.Join, Thread.Sleep, or Thread.Start without any abort, interrupt, or ThreadAbortException usage, since those APIs work identically in modern .NET. It also does not apply to projects staying on .NET Framework.

For uncooperative code such as third-party libraries or native calls, move the work into a separate child process. Communicate via stdin/stdout or IPC and call Process.Kill if a timeout expires, since cooperative cancellation cannot reach code you cannot modify.