C＃线程-ThreadStart代表 [英] C# Threads -ThreadStart Delegate

问题描述

下面的代码错误产量的执行：ProcessPerson没有重载匹配的ThreadStart。

The execution of the following code yields error :No overloads of ProcessPerson Matches ThreadStart.

public class Test
    {
        static void Main()
        {
            Person p = new Person();
            p.Id = "cs0001";
            p.Name = "William";
            Thread th = new Thread(new ThreadStart(ProcessPerson));
            th.Start(p);
        }

        static void ProcessPerson(Person p)
        {
              Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
        }

    }

    public class Person
    {

        public string Id
        {
            get;
            set;
        }

        public string Name
        {
            get;
            set;
        }


    }

如何解决呢？

How to fix it?

推荐答案

首先，你想要的 ParameterizedThreadStart - 的 的ThreadStart 本身不具有任何参数。

Firstly, you want ParameterizedThreadStart - ThreadStart itself doesn't have any parameters.

其次，参数 ParameterizedThreadStart 就是对象，所以你需要改变你的 ProcessPerson 代码从对象转换为人。

Secondly, the parameter to ParameterizedThreadStart is just object, so you'll need to change your ProcessPerson code to cast from object to Person.

static void Main()
{
    Person p = new Person();
    p.Id = "cs0001";
    p.Name = "William";
    Thread th = new Thread(new ParameterizedThreadStart(ProcessPerson));
    th.Start(p);
}

static void ProcessPerson(object o)
{
    Person p = (Person) o;
    Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
}

不过，如果你正在使用C＃2或C＃3的解决方法就是使用匿名方法或lambda表达式：

However, if you're using C# 2 or C# 3 a cleaner solution is to use an anonymous method or lambda expression:

static void ProcessPerson(Person p)
{
    Console.WriteLine("Id :{0},Name :{1}", p.Id, p.Name);
}

// C# 2
static void Main()
{
    Person p = new Person();
    p.Id = "cs0001";
    p.Name = "William";
    Thread th = new Thread(delegate() { ProcessPerson(p); });
    th.Start();
}

// C# 3
static void Main()
{
    Person p = new Person();
    p.Id = "cs0001";
    p.Name = "William";
    Thread th = new Thread(() => ProcessPerson(p));
    th.Start();
}

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