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Windows Runtime 活动的取消是异步的

Windows Runtime 活动的取消请求是异步的：你要求取消某个操作，但它不会等待确认。这篇文章解释了这一行为背后的设计理念。

背景速读

- Raymond Chen 是微软资深开发者，他的博客《The Old New Thing》长期以通俗语言讲解 Windows 内部机制和 API 设计细节，在 Windows 开发者社区极具影响力。 - Windows Runtime（WinRT）是微软为 Windows 8 引入的现代 API 框架，支持 C++/C#/JavaScript 等多种语言调用，广泛用于 UWP 和 WinUI 应用开发。 - 本文讨论 WinRT 中异步操作的取消机制：调用取消方法后，系统不会等待操作真正终止就返回控制权。开发者若在取消后立即检查状态或释放资源，容易遇到竞态条件（race condition）。 - 这一点与传统的同步取消模式不同，容易让不熟悉异步编程模型的开发者写出看似正确但偶发崩溃的代码。

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