c#多线程之间的排他锁的实现

Thread pingTask = new Thread(new ThreadStart(delegate
           {
               //从数据库获取1000条数
               var list = getdata();
           }));
 
           //启动线程
           pingTask.Start();

for (int i = 0; i < 100; i++)
            {
                Thread pingTask = new Thread(new ThreadStart(delegate
               {
                //从数据库获取1000条数
                var list = getdata();
               }));
 
                //启动线程
                pingTask.Start(); 
            }

private List<company> getdata()
        {
            lock (this)
            {
//提取数据
 
                return list;
            }
        }

object obj=new object()
       private List<company> getdata()
       {
           lock (obj)
           {
               List<ckb_com> list = ckbbll.FindList($" com_id >={index} and com_id<{index + pagesize}");
               index = index + pagesize;
 
               return list;
           }
       }