MultiThreadingStudy/MultiThreadingStudy/CreateThreadPool/CreateThreadPool.cs

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace CreateThreadPool
{
	internal class CreateThreadPool
	{
		public static void Create()
		{
			// Min 50, if over create 10 per once
			ThreadPool.SetMinThreads(50, 10);

			ThreadPool.QueueUserWorkItem(Calc);
			ThreadPool.QueueUserWorkItem(Calc, 10.0);
			ThreadPool.QueueUserWorkItem(Calc, 20.0);
		}

		// BackgroundWorker: Wrapper of ThreadPool
		public static void CreateBackgroundWorker()
		{
			BackgroundWorker worker = new BackgroundWorker();
			worker.DoWork += Worker_DoWork;
			worker.RunWorkerAsync("Hello");
		}

		private static void Worker_DoWork(object sender, DoWorkEventArgs e)
		{
			int i = 0;
			while (i < 10)
			{
				Console.WriteLine($"{(e.Argument != null ? e.Argument.ToString() : "")} Running... {++i}");
				Thread.Sleep(1000);
			}
		}

		private static void Calc(object radius)
		{
			if (radius == null)
				return;

			double r = (double)radius;
			double area = r * r * Math.PI;
			Console.WriteLine($"r={r}, area={area}");
		}


	}
}