ThreadStart和ParameterizedThreadStart区别

Posted 2020-08-20 代码描绘人生

 

ThreadStart：

ThreadStart这个委托定义为void ThreadStart(),也就是说,所执行的方法不能有参数。
ThreadStart threadStart=new ThreadStart(Calculate);
Thread thread=new Thread(threadStart);
thread.Start();
public void Calculate()
   {
　double Diameter=0.5;
　Console.Write("The Area Of Circle with a Diameter of {0} is {1}"Diameter,Diameter*Math.PI);
   }
       这里我们用定义了一个ThreadStart类型的委托,这个委托制定了线程需要执行的方法: Calculate,在这个方法里计算了一个直径为0.5的圆的周长,并输出.这就构成了最简单的多线程的例子,在很多情况下这就够用了




ParameterThreadStart：
ParameterThreadStart的定义为void ParameterizedThreadStart(object state)，使用这个这个委托定义的线程的启动函数可以接受一个输入参数,具体例子如下 ：



ParameterizedThreadStart threadStart=new ParameterizedThreadStart(Calculate)
Thread thread=new Thread() ;
thread.Start(0.9);
public void Calculate(object arg)
{
double Diameter=double(arg);
Console.Write("The Area Of Circle with a Diameter of {0} is {1}"Diameter,Diameter*Math.PI);
}

Calculate方法有一个为object类型的参数,虽然只有一个参数,而且还是object类型的,使用的时候尚需要类型转换,但是好在可以有参数了,并且通过把多个参数组合到一个类中,然后把这个类的实例作为参数传递,就可以实现多个参数传递.比如:

class AddParams
{
    public int a, b;

    public AddParams(int numb1, int numb2)
    {
      a = numb1;
      b = numb2;
    }
}
#endregion

class Program
{
    static void Main(string[] args)
    {
      Console.WriteLine("***** Adding with Thread objects *****");
      Console.WriteLine("ID of thread in Main(): {0}",
        Thread.CurrentThread.ManagedThreadId);

      AddParams ap = new AddParams(10, 10);
      Thread t = new Thread(new ParameterizedThreadStart(Add));
      t.Start(ap);
      Console.ReadLine();
    }

    #region Add method
    static void Add(object data)
    {
      if (data is AddParams)
      {
        Console.WriteLine("ID of thread in Main(): {0}",
          Thread.CurrentThread.ManagedThreadId);

        AddParams ap = (AddParams)data;
        Console.WriteLine("{0} + {1} is {2}",
          ap.a, ap.b, ap.a + ap.b);
      }
    }
    #endregion
}
}