public partial class FormMain : Form  
{  
    public FormMain()  
    {  
        InitializeComponent();  
    }  
 
    AutoResetEvent autoSet = new AutoResetEvent(false);  
    List<string> tempList = new List<string>() { "init0", "init1", "init2" };  
 
    private void buttonStartThreads_Click(object sender, EventArgs e)  
    {  
        object syncObj = new object();  
 
        Thread t1 = new Thread(() =>
        {  
            //确保等待t2开始之后才运行下面的代码  
            autoSet.WaitOne();  
            lock (syncObj)  
            {  
                foreach (var item in tempList)  
                {  
                    Thread.Sleep(1000);  
                }  
            }  
        });  
        t1.IsBackground = true;  
        t1.Start();  
 
        Thread t2 = new Thread(() =>
        {  
            //通知t1可以执行代码  
            autoSet.Set();  
            //沉睡1秒是为了确保删除操作在t1的迭代过程中  
            Thread.Sleep(1000);  
            lock (syncObj)  
            {  
                tempList.RemoveAt(1);  
            }  
        });  
        t2.IsBackground = true;  
        t2.Start();  
    }  
} 

private void buttonStartThreads_Click(object sender, EventArgs e)  
{  
    SampleClass sample1 = new SampleClass();  
    SampleClass sample2 = new SampleClass();  
    sample1.StartT1();  
    sample2.StartT2();  
}  
 
class SampleClass  
{  
    public static List<string> TempList = new List<string>() { "init0",   
        "init1", "init2" };  
    static AutoResetEvent autoSet = new AutoResetEvent(false);  
    object syncObj = new object();  
          
    public void StartT1()  
    {  
        Thread t1 = new Thread(() =>
        {  
            //确保等待t2开始之后才运行下面的代码  
            autoSet.WaitOne();  
            lock (syncObj)  
            {  
                foreach (var item in TempList)  
                {  
                    Thread.Sleep(1000);  
                }  
            }  
        });  
        t1.IsBackground = true;  
        t1.Start();  
    }  
 
    public void StartT2()  
    {  
        Thread t2 = new Thread(() =>
        {  
            //通知t1可以执行代码  
            autoSet.Set();  
            //沉睡1秒是为了确保删除操作在t1的迭代过程中  
            Thread.Sleep(1000);  
            lock (syncObj)  
            {  
                TempList.RemoveAt(1);  
            }  
        });  
        t2.IsBackground = true;  
        t2.Start();  
    }  
}