C# ThreadStart和ParameterizedThreadStart區別

 

ThreadStart：

ThreadStart這個委托定義為void ThreadStart(),也就是說,所執行的方法不能有參數。
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);
   }
       這里我們用定義了一個ThreadStart類型的委托,這個委托制定了線程需要執行的方法: Calculate,在這個方法里計算了一個直徑為0.5的圓的周長,並輸出.這就構成了最簡單的多線程的例子,在很多情況下這就夠用了




ParameterThreadStart：
ParameterThreadStart的定義為void ParameterizedThreadStart(object state)，使用這個這個委托定義的線程的啟動函數可以接受一個輸入參數,具體例子如下 ：



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方法有一個為object類型的參數,雖然只有一個參數,而且還是object類型的,使用的時候尚需要類型轉換,但是好在可以有參數了,並且通過把多個參數組合到一個類中,然后把這個類的實例作為參數傳遞,就可以實現多個參數傳遞.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
}
}