多个线程在C#中调用相同的方法

Question

我有以下C#代码片段,我在其中模拟了我的问题.在这个程序中,我有一个调用ReadRooms方法的Service函数.现在我在不同的线程上调用服务方法.我期待ServiceCall和ReadRooms方法都会被平分,但我得到的结果不正确.

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

namespace ConsoleApplication1
{
    class Program
    {
        public static void ReadRooms(int i)
        {
            Console.WriteLine("Reading Room::" + i);
            Thread.Sleep(2000);
        }
        public static void CallService(int i)
        {
            Console.WriteLine("ServiceCall::" + i);
            ReadRooms(i);

        }
        static void Main(string[] args)
        {
            Thread[] ts = new Thread[4];
            for (int i = 0; i < 4; i++)
            {
                ts[i] = new Thread(() =>
                    {
                        int temp = i;
                        CallService(temp);


                    });
                ts[i].Start();
            }
            for (int i = 0; i < 4; i++)
            {
                ts[i].Join();
            }
            Console.WriteLine("done");
            Console.Read();

        }
    }
}

Answer 1

你仍在"捕获循环变量".你正在创建一个temp但是太晚了,什么时候i已经被捕获了.

试试这个:

for (int i = 0; i < 4; i++)
{
   int temp = i;              // outside the lambda
   ts[i] = new Thread(() =>
   {
        //int temp = i;       // not here
        CallService(temp);
   });
   ts[i].Start();
}