多线程(2)Thread

　　我们先从最基础的Thread说起。

 

创建并启动线程

创建并启动一个线程，如下代码：

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
            var thread = new Thread(PrintNumbers);
            thread.Start();

            Console.WriteLine("Thread Start...");
            Console.ReadKey();
        }

        /// <summary>
        /// 匹配委托的方法
        /// </summary>
        public static void PrintNumbers()
        {
            Console.WriteLine("Starting......");
            for (int i = 0; i < 10; i++)
            {
                Console.WriteLine(i);
            }
        }
    }
}

 

运行结果：

 

暂停线程

假如需要暂停当前线程，可以调用Thread.Sleep方法，使当前线程处于阻塞状态，如下代码：

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
            var thread = new Thread(PrintNumbersWithDelay);
            thread.Start();

            Console.WriteLine("Thread Start...");
            Console.ReadKey();
        }

        /// <summary>
        /// 
        /// </summary>
        public static void PrintNumbersWithDelay()
        {
            Console.WriteLine("Starting......");
            for (int i = 0; i < 10; i++)
            {
                Thread.Sleep(TimeSpan.FromMilliseconds(1000));
                Console.WriteLine(string.Format("{0}  {1}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), i));
            }
        }
    }
}

 

输出结果：

合并线程

如果需要等待某个子线程执行行，主线程才继续执行时，可以使用Thread.Join方法来实现，如下代码：

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
            //Thread
            var thread = new Thread(PrintNumbersWithDelay);
            thread.Start();
            thread.Join();

            Console.WriteLine("Thread Completed!");
            Console.ReadKey();
        }

        /// <summary>
        /// 
        /// </summary>
        public static void PrintNumbersWithDelay()
        {
            Console.WriteLine("Starting......");
            for (int i = 0; i < 10; i++)
            {
                Thread.Sleep(TimeSpan.FromMilliseconds(1000));//线程阻塞1s，此时线程状态为WaitSleepJoin
                Console.WriteLine(string.Format("当前时间：{0}，线程状态：{1}，结果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"),Thread.CurrentThread.ThreadState, i));
            }
        }
    }
}

 输出结果：

终止线程

 如果在子线程运行过程中强制终止它，可以调用Thread.Abort方法，这会给当前子线程触发ThreadAbortException异常，导致线程被终止！

如下代码：

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Starting Program...");
            var thread = new Thread(PrintNumbersWithDelay);
            thread.Start();

            Thread.Sleep(TimeSpan.FromMilliseconds(6000));
            thread.Abort();

            Console.WriteLine("Thread has been abort!");
            Console.ReadKey();
        }

        /// <summary>
        /// 
        /// </summary>
        public static void PrintNumbersWithDelay()
        {
            Console.WriteLine("Starting......");
            for (int i = 0; i < 10; i++)
            {
                Thread.Sleep(TimeSpan.FromMilliseconds(1000));
                Console.WriteLine(string.Format("当前时间：{0}，线程状态：{1}，结果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), Thread.CurrentThread.ThreadState, i));
            }
        }
    }
}

线程传递参数

通过分析可以发现，Thread接受的实际上是一个委托，包括无参数的委托和接受一个Object类型的委托，

 

如下代码：

namespace ConsoleApplication17
{
    class Program
    {
        static void Main(string[] args)
        {
            Console.WriteLine("Main thread starting...");
            var thread = new Thread(PrintNumbersWithCount);
            thread.Start(5);
            thread.Join();

            Console.WriteLine("Main thread completed!");
            Console.ReadKey();
        }

        /// <summary>
        /// 匹配委托方法，带参数
        /// </summary>
        public static void PrintNumbersWithCount(object obj)
        {
            Console.WriteLine("Sub thread starting...");
            var number = Convert.ToInt32(obj);
            for (int i = 0; i < number; i++)
            {
                Console.WriteLine(string.Format("当前时间：{0}，线程状态：{1}，结果：{2}", DateTime.Now.ToString("yyyy-MM-dd HH:mm:ss"), Thread.CurrentThread.ThreadState, i));
            }
        }
    }
}

 

输出结果：