在一般的项目中我们很少用到c#实现每隔规定时间自动执行程序代码，但是如果你经历的项目多，或者应用程序做的比较多的话，c#实现每隔规定时间自动执行程序代码就用的比较多。像玩网游做挂机定时发布广告这样的项目中就用到了c#实现每隔规定时间自动执行程序代码。

Thread thread25yi = new Thread(new ThreadStart(obj.MethodTimer1)); 
thread25yi.Start(); 
void MethodTimer1() 
{ 
while (true) 
{ 
Console.WriteLine(DateTime.Now.ToString() + "_" + thread25yi.CurrentThread.ManagedThreadId.ToString()); 
thread25yi.CurrentThread.Join(100);//阻止设定时间 
} 
} 

System.Timers.Timer t25yi = new System.Timers.Timer(100);//实例化Timer类，设置时间间隔为100毫秒
t25yi.Elapsed += new System.Timers.ElapsedEventHandler(obj.MethodTimer2);//当到达时间的时候执行MethodTimer2事件 
t25yi.AutoReset = true;//false是执行一次，true是一直执行
t25yi.Enabled = true;//设置是否执行System.Timers.Timer.Elapsed事件 
while (true) 
{ 
Console.WriteLine("test_" + Thread.CurrentThread.ManagedThreadId.ToString()); 
Thread.Sleep(100); 
} 
void MethodTimer2(object source, System.Timers.ElapsedEventArgs e) 
{ 
Console.WriteLine(DateTime.Now.ToString() + "_" + Thread.CurrentThread.ManagedThreadId.ToString()); 
}

System.Threading.Timer threadTimer = new System.Threading.Timer(new System.Threading.TimerCallback(obj.MethodTimer3), null, 0, 100); 
while (true) 
{ 
Console.WriteLine("test_" + Thread.CurrentThread.ManagedThreadId.ToString()); 
Thread.Sleep(100); 
}  
void MethodTimer3(Object state) 
{ 
Console.WriteLine(DateTime.Now.ToString() + "_" + Thread.CurrentThread.ManagedThreadId.ToString()); 
}