C#线程传递参数的方式

前言：线程间参数的传递经常用到，本文介绍线程间传递参数常用的几种方式：

方式一：使用ParameterizedThreadStart委托

示例如下：

using System;
using System.Threading;

namespace ConsoleLearn
{
    class Program
    {
        static void Main(string[] args)
        {
            Thread thread = new Thread(new ParameterizedThreadStart(SayHello));
            thread.Start("zhangsan");

            //简写
            //Thread thread = new Thread(SayHello);
            //thread.Start("zhangsan");

            Console.ReadKey();
        }

        public static void SayHello(object name)
        {
            if (!string.IsNullOrEmpty(name as string))
            {
                Console.WriteLine($"Hello! {name}");
            }
        }
    }
}

查看ParameterizedThreadStart底层如下：

    public delegate void ParameterizedThreadStart(object? obj);

可以看出ParameterizedThreadStart是底层自定义的一个只有一个object参数，无返回值的委托，所以传递方法的时候需要一个只有一个object参数，且返回类型为void的方法（委托实质就是同一种类型方法的抽象）

方法二：定义自定义类：

示例如下：

using System;
using System.Threading;

namespace ConsoleLearn
{
    public class MyThread
    {
        private string name;

        public MyThread(string name)
        {
            this.name = name;
        }

        public void SayHello()
        {
            Console.WriteLine($"Hello{name}");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            //Thread thread = new Thread(new ParameterizedThreadStart(SayHello));
            //thread.Start("zhangsan");

            //简写
            //Thread thread = new Thread(SayHello);
            //thread.Start("zhangsan");
            MyThread myThread = new MyThread("zhangsan");

            Thread thread = new Thread(myThread.SayHello);
            thread.Start();

            Console.ReadKey();
        }

        public static void SayHello(object name)
        {
            if (!string.IsNullOrEmpty(name as string))
            {
                Console.WriteLine($"Hello! {name}");
            }
        }
    }


}

 可以看出，实质就是将参数封装在一个类中，实例化的时候将参数传递进去

 方式三：Lambda表达式：

示例如下：

using System;
using System.Threading;

namespace ConsoleLearn
{
    public class MyThread
    {
        private string name;

        public MyThread(string name)
        {
            this.name = name;
        }

        public void SayHello()
        {
            Console.WriteLine($"Hello{name}");
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            //Thread thread = new Thread(new ParameterizedThreadStart(SayHello));
            //thread.Start("zhangsan");

            //简写
            //Thread thread = new Thread(SayHello);
            //thread.Start("zhangsan");
            //MyThread myThread = new MyThread("zhangsan");

            //Thread thread = new Thread(myThread.SayHello);
            //thread.Start();

            Thread thread = new Thread(()=>SayHello("zhangsan"));
            thread.Start();

            Console.ReadKey();
        }

        //public static void SayHello(object name)
        //{
        //    if (!string.IsNullOrEmpty(name as string))
        //    {
        //        Console.WriteLine($"Hello! {name}");
        //    }
        //}
        public static void SayHello(string name)
        {
            if (!string.IsNullOrEmpty(name as string))
            {
                Console.WriteLine($"Hello! {name}");
            }
        }
    }


}

以上就是线程间传递参数的三种方式，若有其他方式，欢迎补充交流，3Q~