lock invoke 死锁事例

代码如下：

 using System;
 using System.Collections.Generic;
 using System.Windows.Forms;
 using System.Threading;

 namespace TestThread
 {
     public partial class Form3 : Form
     {
         //死锁
         LongLock mCnt = new LongLock();

         public Form3()
         {
             InitializeComponent();

             mCnt.mEventChanged += mCnt_mEventChanged;
         }

         void mCnt_mEventChanged(string arg1, long arg2, bool arg3)
         {
             this.Invoke(new Action(
                 () =>
                 {
                     this.Text = mCnt.Value.ToString();
                     Application.DoEvents();
                 }));
         }

         private void Form3_Load(object sender, EventArgs e)
         {

         }

         private void button1_Click(object sender, EventArgs e)
         {
             ;
             )
             {
                 Random random = new Random();
                 Thread t = new Thread(new ThreadStart(
                     () =>
                     {
                         Thread.Sleep(random.Next(, ));

                         mCnt.Plus(Environment.TickCount.ToString());

                     }));
                 t.Start();
                 Thread.Sleep();
             }//end while
         }

     }

     public class LongLock
     {
         object _objLock = null;
         HashSet<string> _hashSet = null;

         public event Action<string, long, bool> mEventChanged;

         public LongLock()
         {
             _hashSet = new HashSet<string>();
             _objLock = new object();
         }

         public int Value
         {
             get
             {
                 lock (_objLock)
                 {
                     return _hashSet.Count;
                 }
             }
         }

         public void Plus(string id)
         {

             lock (_objLock)
             {
                 if (!_hashSet.Contains(id))
                 {

                     _hashSet.Add(id);
                     Notice(id, _hashSet.Count, true);
                 }
             }

         }

         public void Minus(string id)
         {
             lock (_objLock)
             {
                 if (_hashSet.Contains(id))
                 {
                     _hashSet.Remove(id);
                     Notice(id, _hashSet.Count, true);
                 }
             }
         }

         void Notice(string id, long value, bool isPlus)
         {
             if (mEventChanged != null)
             {
                 mEventChanged(id, value, isPlus);
             }
         }

     }

     public class LongLock2
     {
         object _objLock = null;
         HashSet<string> _hashSet = null;

         public event Action<string, long, bool> mEventChanged;

         public LongLock2()
         {
             _hashSet = new HashSet<string>();
             _objLock = new object();
         }

         public int Value
         {
             get
             {
                 lock (_objLock)
                 {
                     return _hashSet.Count;
                 }
             }
         }

         public void Plus(string id)
         {
             bool b = false;
             ;
             lock (_objLock)
             {
                 if (!_hashSet.Contains(id))
                 {
                     b = true;
                     _hashSet.Add(id);
                     value = _hashSet.Count;
                 }
             }
             if (b)
             {
                 Notice(id, _hashSet.Count, true);
             }
         }

         public void Minus(string id)
         {
             bool b = false;
             ;
             lock (_objLock)
             {
                 if (_hashSet.Contains(id))
                 {
                     b = true;
                     _hashSet.Remove(id);
                     value = _hashSet.Count;
                 }
             }
             if (b)
             {
                 Notice(id, value, false);
             }
         }

         void Notice(string id, long value, bool isPlus)
         {
             if (mEventChanged != null)
             {
                 mEventChanged(id, value, isPlus);
             }
         }

     }

 }