如何在C＃中检查线程是否处于活动状态

Thread类负责在多线程编程中创建和管理线程。它提供了一个称为IsAlive的属性来检查线程是否处于活动状态。换句话说，此属性的值指示线程的当前执行。

句法：

public bool IsAlive { get; }

返回值：如果线程已启动且未正常终止或中止，则此属性返回true。否则，返回false 。此属性的返回类型为System.Boolean 。

下面的程序说明了IsAlive属性的用法：

范例1：

// C# program to illustrate the 
// use of IsAlive property
using System;
using System.Threading;
  
public class GFG {
  
    // Main Method
    static public void Main()
    {
        Thread thr;
  
        // Get the reference of main Thread
        // Using CurrentThread property
        thr = Thread.CurrentThread;
  
        // Display the current state of 
        // the main thread Using IsAlive
        // property
        Console.WriteLine("Is main thread is alive"+
                            " ? : {0}", thr.IsAlive);
    }
}

输出：

Is main thread is alive ? : True

范例2：

// C# program to illustrate the 
// use of IsAlive property
using System;
using System.Threading;
  
public class GFG {
  
    // Main method
    public static void Main()
    {
        // Creating and initializing threads
        Thread Thr1 = new Thread(new ThreadStart(job));
        Thread Thr2 = new Thread(new ThreadStart(job));
  
        // Display the current state of 
        // the threads Using IsAlive 
        // property
        Console.WriteLine("Is thread 1 is alive : {0}",
                                         Thr1.IsAlive);
  
        Console.WriteLine("Is thread 2 is alive : {0}",
                                         Thr2.IsAlive);
        Thr1.Start();
        Thr2.Start();
  
        // Display the current state of 
        // the threads Using IsAlive
        // property
        Console.WriteLine("Is thread 1 is alive : {0}",
                                         Thr1.IsAlive);
  
        Console.WriteLine("Is thread 2 is alive : {0}",
                                         Thr2.IsAlive);
    }
  
    // Static method
    public static void job()
    {
        Thread.Sleep(2000);
    }
}

输出：

Is thread 1 is alive : False
Is thread 2 is alive : False
Is thread 1 is alive : True
Is thread 2 is alive : True

参考：

• https://docs.microsoft.com/zh-cn/dotnet/api/system.threading.thread.isalive?view=netframework-4.7.2