How Can I Effectively Cancel TPL Tasks Without Using Thread.Abort()?

Avoid using Thread.Abort() to cancel TPL tasks

When using threads to execute tasks, if you try to terminate the thread using the Abort() method, the task will continue to execute without interruption. This is because tasks use background threads from the thread pool, and these threads are not affected by thread termination.

Alternative: Cancellation Tokens

In order to propagate cancellation requests to tasks, a cancellation token should be used. These markers provide a cooperative thread cancellation mechanism that represents cancellation requests as signals that tasks can monitor and respond to.

Implementation using cancel tags

The following code snippet demonstrates how to use a cancellation tag to implement task cancellation:

<code class="language-csharp">// 创建一个取消标记源
var ts = new CancellationTokenSource();

// 从源获取取消标记
CancellationToken ct = ts.Token;

// 创建一个新任务
Task.Factory.StartNew(() => {
    while (true) {
        // 执行繁重的计算
        Thread.Sleep(100);

        // 检查取消请求
        if (ct.IsCancellationRequested) {
            Console.WriteLine("任务已取消");
            break;
        }
    }
}, ct);

// 模拟等待任务完成3秒
Thread.Sleep(3000);

// 决定取消任务
ts.Cancel();</code>

Notes on .Abort()

It should be noted that it is generally not recommended to use the Abort() method for thread cancellation. This approach can lead to unreliable behavior and potential application crashes. Cancellation markers provide a more structured and reliable method for task cancellation.

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