如何在C#中取消启动进程的异步任务？

using System;
using System.Diagnostics;
using System.Threading;
using System.Threading.Tasks;

public class Program
{
    public static async Task Main()
    {
        // 创建一个CancellationTokenSource对象，用于生成CancellationToken
        CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();

        // 获取CancellationToken
        CancellationToken cancellationToken = cancellationTokenSource.Token;

        // 启动进程的异步任务
        Task processTask = StartProcessAsync(cancellationToken);

        // 模拟一段时间后取消任务
        await Task.Delay(5000);
        cancellationTokenSource.Cancel();

        try
        {
            // 等待异步任务完成
            await processTask;
        }
        catch (OperationCanceledException)
        {
            Console.WriteLine("任务已取消");
        }
    }

    public static async Task StartProcessAsync(CancellationToken cancellationToken)
    {
        // 创建进程对象
        Process process = new Process();
        process.StartInfo.FileName = "your_process.exe";
        process.StartInfo.Arguments = "your_arguments";

        // 启动进程
        process.Start();

        // 等待进程退出或取消任务
        await Task.Run(() =>
        {
            process.WaitForExit();
            cancellationToken.ThrowIfCancellationRequested();
        }, cancellationToken);

        Console.WriteLine("进程已退出");
    }
}