[英]Use ThreadPool in C# within a loop and wait for all threads to finish
我在 C# 中有一个如下所示的简单代码:
using System;
using System.Threading;
using System.Diagnostics;
namespace ThreadPooling
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter the number of calculations to be made:");
int calculations= Convert.ToInt32(Console.ReadLine());
Console.WriteLine("Thread Pool Execution");
for (int i = 1; i <= calculations; i++)
{
Console.WriteLine("Staring process " + i + "...");
ThreadPool.QueueUserWorkItem(new WaitCallback(Process(i)));
}
Console.WriteLine("All calculations done.");
Console.WriteLine("\nPress any key to exit the program...");
Console.ReadKey();
}
static void Process(object callback, int name)
{
for (int i = 0; i <= 10; i++)
{
Console.WriteLine(i + " is the current number in " + name);
}
}
}
}
我希望main
能够使用线程池和参数调用Process
。 然后我希望程序在告诉用户它完成之前等待所有线程完成。 我该怎么做? 似乎我无法在 Process 中放置参数,我得到: Error CS7036 There is no argument given that corresponds to the required formal parameter 'name' of 'Program.Process(object, int)'
而且我不清楚如何告诉 C# 在告诉用户它完成之前等待循环中的所有进程完成。
.NET 已经快 20 年了,里面有几代改进的 API。
这对于较新的任务并行库方法来说是微不足道的。 例如
using System;
using System.Collections.Generic;
using System.Threading.Tasks;
namespace ThreadPooling
{
class Program
{
static void Main(string[] args)
{
Console.WriteLine("Enter the number of calculations to be made:");
int calculations = Convert.ToInt32(Console.ReadLine());
var tasks = new List<Task>();
for (int i = 1; i <= calculations; i++)
{
int processNum = i;
Console.WriteLine("Staring process " + processNum + "...");
var task = Task.Run(() => Process(processNum));
tasks.Add(task);
}
Task.WaitAll(tasks.ToArray());
Console.WriteLine("All calculations done.");
Console.WriteLine("\nPress any key to exit the program...");
Console.ReadKey();
}
static void Process(int name)
{
for (int i = 0; i <= 10; i++)
{
Console.WriteLine(i + " is the current number in " + name);
}
}
}
}
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