C#线程池求简单例子

陽陽陽

问题：代码不按设想的工作：

易语言代码：

  

窗口程序集名	保 留	保 留	备 注
窗口程序集_启动窗口
变量名	类 型	数组	备 注
鱼刺类_线程池EX	鱼刺类_线程池Ex

子程序名	返回值类型	公开	备 注
__启动窗口_创建完毕

变量名	类 型	静态	数组	备 注
n	整数型

鱼刺类_线程池EX.创建 (1, 4, , , )
计次循环首 (10, n)
如果真 (取反 (鱼刺类_线程池EX.投递任务 (&test, n)))
调试输出 (“failed”)

计次循环尾 ()

子程序名	返回值类型	公开	备 注
test
参数名	类 型	参考	可空	数组	备 注
n	整数型

调试输出 (“entering”, n)
延时 (2000)
调试输出 (“exit”, n)

i支持库列表	支持库注释
spec	特殊功能支持库

.版本 2<br /> .支持库 spec<br /> <br /> .程序集 窗口程序集_启动窗口<br /> .程序集变量 鱼刺类_线程池EX, 鱼刺类_线程池Ex<br /> <br /> .子程序 __启动窗口_创建完毕<br /> .局部变量 n, 整数型<br /> <br /> 鱼刺类_线程池EX.创建 (1, 4, , , )<br /> .计次循环首 (10, n)<br />     .如果真 (取反 (鱼刺类_线程池EX.投递任务 (&test, n)))<br />         调试输出 (“failed”)<br />     .如果真结束<br /> <br /> .计次循环尾 ()<br /> <br /> <br /> <br /> .子程序 test<br /> .参数 n, 整数型<br /> <br /> 调试输出 (“entering”, n)<br /> 延时 (2000)<br /> 调试输出 (“exit”, n)

但是到了C#，New Bing的代码有有问题了：

[C#] 纯文本查看 复制代码

using System;
using System.Threading;

namespace ThreadPoolExample
{
    class Program
    {
        static void Main(string[] args)
        {
            int maxWorkerThreads, maxCompletionPortThreads;
            ThreadPool.GetMaxThreads(out maxWorkerThreads, out maxCompletionPortThreads);
            ThreadPool.SetMaxThreads(5, maxCompletionPortThreads);

            for (int i = 0; i < 20; i++)
            {
                ThreadPool.QueueUserWorkItem(new WaitCallback(Task), i);
            }

            Console.ReadLine();
        }

        static void Task(object state)
        {
            Console.WriteLine("Task {0} is running on a thread from the thread pool.", state);
            Thread.Sleep(1000);            Console.WriteLine("Task {0} exited.", state);
        }
    }
}

会输出：
Task 18 is running on a thread from the thread pool.
Task 4 is running on a thread from the thread pool.
Task 13 is running on a thread from the thread pool.
Task 19 is running on a thread from the thread pool.
Task 16 is running on a thread from the thread pool.
Task 8 is running on a thread from the thread pool.
Task 1 is running on a thread from the thread pool.
Task 3 is running on a thread from the thread pool.
Task 2 is running on a thread from the thread pool.
Task 9 is running on a thread from the thread pool.
Task 14 is running on a thread from the thread pool.
Task 17 is running on a thread from the thread pool.
Task 0 is running on a thread from the thread pool.
Task 5 is running on a thread from the thread pool.
Task 10 is running on a thread from the thread pool.
Task 11 is running on a thread from the thread pool.
Task 12 is running on a thread from the thread pool.
Task 7 is running on a thread from the thread pool.
Task 6 is running on a thread from the thread pool.
Task 15 is running on a thread from the thread pool.
Task 8 exited.
Task 3 exited.
Task 2 exited.
Task 4 exited.
Task 18 exited.
Task 0 exited.
Task 1 exited.
Task 5 exited.
Task 13 exited.
Task 19 exited.
Task 16 exited.
Task 9 exited.
Task 14 exited.
Task 10 exited.
Task 11 exited.
Task 12 exited.
Task 7 exited.
Task 6 exited.
Task 15 exited.
Task 17 exited.

明明已经达到了最大上限，为什么它还会在那进入线程？

感谢各位大佬的答疑，非常谢谢。

ps：我发帖肯定就是不需要New Bing, ChatGPT那种晦涩难懂，各种专有名词，带有错误的答案（而且我都问过了），我希望我得到的答案是简单易懂的，没有错误的，感谢感谢感谢。

陽陽陽

问题解决：线程池线程数不能超过CPU的下限

江畔孤舟

c#线程池好像已经过时了. 使用task和taskFactory代替了,官方文档说是更安全,更好管理https://learn.microsoft.com/zh-cn/dotnet/api/system.threading.tasks.taskfactory?view=netframework-4.8

陽陽陽

真的没人吗

梦寻简单

这三行代码应该能解决你的疑惑：
int minWorkerThreads, minCompletionPortThreads;
ThreadPool.GetMinThreads(out minWorkerThreads, out minCompletionPortThreads);
Console.WriteLine("minWorkerThreads：{0}, minCompletionPortThreads：{1}", minWorkerThreads, minCompletionPortThreads);