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thread-abort-migration

Guides migration of .NET Framework Thread.Abort usage to cooperative cancellation in modern .NET. USE FOR: modernizing code that calls Thread.Abort, catching ThreadAbortException, replacing Thread.ResetAbort, replacing Thread.Interrupt for thread termination, resolving PlatformNotSupportedException or SYSLIB0006 after retargeting to .NET 6+, migrating ASP.NET Response.End or Response.Redirect(url, true) which internally call Thread.Abort. DO NOT USE FOR: code that only uses Thread.Join, Thread.Sleep, or Thread.Start without any abort, interrupt, or ThreadAbortException usage — these APIs work identically in modern .NET and need no migration. Also not for projects staying on .NET Framework, or Thread.Abort usage inside third-party libraries you do not control.

plugins/dotnet-upgrade/skills/thread-abort-migration/SKILL.md

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# Thread.Abort Migration

This skill helps an agent migrate .NET Framework code that uses `Thread.Abort` to the cooperative cancellation model required by modern .NET (6+). `Thread.Abort` throws `PlatformNotSupportedException` in modern .NET — there is no way to forcibly terminate a managed thread. The skill identifies the usage pattern first, then applies the correct replacement strategy.

## When to Use

- Migrating a .NET Framework project to .NET 6+ that calls `Thread.Abort`
- Replacing `ThreadAbortException` catch blocks that use control flow or cleanup logic
- Removing `Thread.ResetAbort` calls that cancel pending aborts
- Replacing `Thread.Interrupt` for waking blocked threads
- Migrating ASP.NET code that uses `Response.End` or `Response.Redirect(url, true)`, which internally call `Thread.Abort`
- Resolving `PlatformNotSupportedException` or `SYSLIB0006` warnings after a target framework change

## When Not to Use
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