C# CancellationToken的使用小结

var cts = new CancellationTokenSource();
CancellationToken token = cts.Token;

Task.Run(() => 
{
    // 任务逻辑
}, token);

cts.Cancel(); // 请求取消所有关联 Token 的任务

public void LongRunningOperation(CancellationToken token)
{
    while (!token.IsCancellationRequested)
    {
        // 持续工作...
        Thread.Sleep(1000);
    }

    // 清理资源，优雅退出
    Console.WriteLine("操作被取消。");
}

token.ThrowIfCancellationRequested(); // 如果取消已请求，抛出异常

token.Register(() => 
{
    Console.WriteLine("清理资源，取消已触发！");
});

var cts = new CancellationTokenSource(TimeSpan.FromSeconds(5)); // 5秒后自动取消

var linkedCts = CancellationTokenSource.CreateLinkedTokenSource(token1, token2);
var linkedToken = linkedCts.Token;

try
{
    await SomeAsyncMethod(token);
}
catch (OperationCanceledException)
{
    Console.WriteLine("操作已被取消。");
}

var cts = new CancellationTokenSource();
var token = cts.Token;

// 启动任务
var task = Task.Run(() =>
{
    try
    {
        while (true)
        {
            token.ThrowIfCancellationRequested();
            Console.WriteLine("工作...");
            Thread.Sleep(1000);
        }
    }
    catch (OperationCanceledException)
    {
        Console.WriteLine("任务取消。");
    }
});

// 例如：用户按下取消按钮，或者超时自动取消
Thread.Sleep(3000);
cts.Cancel();