C# - 循环不会停止（每次迭代都会启动新任务）

Question

所以我有一个解决哲学家用餐问题的基本方法如下：

using System;
using System.Threading.Tasks;

namespace Conductor
{
    class Program
    {
        private static object _locker = new object();

        static void Main(string[] args)
        { 
            object[] sticks = {new object(),
                               new object(),
                               new object(),
                               new object(),
                               new object()};

            for (int i = 0; i<5; i++)
            {
                int next = (i + 1) % 5;
                Task.Factory.StartNew(() => Eat(sticks[i], sticks[next], i)); 
            }
        }

        static void Eat(object _leftChopstick, object _rightChopstick, int i)
        {
            lock (_locker)
            {
                lock (_leftChopstick)
                {
                    lock (_rightChopstick)
                    {
                        Console.WriteLine("Eating" + i);
                    }
                }
            }
        }
    }
}

虽然它可能不是最有效的解决方案，但当 i 设置为 5 时，它会在 "StartNew" 调用中引发 IndexOutOfRange 异常。我无法弄清楚使用任务工厂如何以某种方式使我的程序被忽略for 循环条件。

如果我运行这个代码，没问题：

using System;
using System.Threading.Tasks;

namespace Conductor
{
    class Program
    {
        private static object _locker = new object();

        static void Main(string[] args)
        { 
            object[] sticks = { new object(),
                               new object(),
                               new object(),
                               new object(),
                               new object()};

            int i = 0;
            Task.Factory.StartNew(() => Eat(sticks[i], sticks[i + 1], i));
            Task.Factory.StartNew(() => Eat(sticks[i+1], sticks[i + 2], i + 1));
            Task.Factory.StartNew(() => Eat(sticks[i+2], sticks[i + 3], i + 2));
            Task.Factory.StartNew(() => Eat(sticks[i+3], sticks[i + 4], i + 3));
            Task.Factory.StartNew(() => Eat(sticks[i + 4], sticks[0], i + 4));
            Console.ReadLine();
        }

        static void Eat(object _leftChopstick, object _rightChopstick, int i)
        {
            lock (_locker)
            {
                lock (_leftChopstick)
                {
                    lock (_rightChopstick)
                    {
                        Console.WriteLine("Eating" + i);
                    }
                }
            }
        }
    }
}

此外，如果我通过循环进行调试，我会得到同样的异常。

如有任何帮助，我们将不胜感激。抱歉，如果它太基础，或者如果我的代码中存在一些我遗漏的微不足道的缺陷。谢谢

Answer 1

for (int i = 0; i < 5; i++)
            {
                int j = i;
                int next = (i + 1) % 5;
                Task.Factory.StartNew(() => Eat(sticks[j], sticks[next], j));
            }

C# - 循环不会停止（每次迭代都会启动新任务）

C# - Looping won't stop (each iteration starts new Task)

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task-parallel-library