使用System.Timers.Timer类

System.Timers.Timer t =  
new System.Timers.Timer(10000); 
//实例化Timer类，设置间隔时间为10000毫秒；  
t.Elapsed +=  
new System.Timers.ElapsedEventHandler(theout); 
//到达时间的时候执行事件；  
t.AutoReset = true; 
//设置是执行一次（false）还是一直执行(true)；  
t.Enabled = true; 
//是否执行System.Timers.Timer.Elapsed事件；  
 
public void theout( 
object source,  
System.Timers.ElapsedEventArgs e)  
 {  
  MessageBox.Show("OK!");  
 } 

class Program
  {
    static void Main(string[] args)
    {
      Timer timer = new Timer(TimerCallback,null,0,2000);
      
      Console.ReadLine();
    }
 
    private static void TimerCallback(object o)
    {
      Console.WriteLine("in TimerCallback method");
      GC.Collect();
 
      
    }
  }

.method private hidebysig static void Main(string[] args) cil managed
{
 .entrypoint
 // Code size    32 (0x20)
 .maxstack 8
 IL_0000: ldnull
 IL_0001: ldftn   void GCTest.Program::TimerCallback(object)
 IL_0007: newobj   instance void [mscorlib]System.Threading.TimerCallback::.ctor(object,
                                           native int)
 IL_000c: ldnull
 IL_000d: ldc.i4.0
 IL_000e: ldc.i4   0x7d0
 IL_0013: newobj   instance void [mscorlib]System.Threading.Timer::.ctor(class [mscorlib]System.Threading.TimerCallback,
                                       object,
                                       int32,
                                       int32)
 IL_0018: pop
 IL_0019: call    string [mscorlib]System.Console::ReadLine()
 IL_001e: pop
 IL_001f: ret
} // end of method Program::Main

method private hidebysig static void Main(string[] args) cil managed
{
 .entrypoint
 // Code size    33 (0x21)
 .maxstack 4
 .locals init ([0] class [mscorlib]System.Threading.Timer timer)
 IL_0000: nop
 IL_0001: ldnull
 IL_0002: ldftn   void GCTest.Program::TimerCallback(object)
 IL_0008: newobj   instance void [mscorlib]System.Threading.TimerCallback::.ctor(object,
                                           native int)
 IL_000d: ldnull
 IL_000e: ldc.i4.0
 IL_000f: ldc.i4   0x7d0
 IL_0014: newobj   instance void [mscorlib]System.Threading.Timer::.ctor(class [mscorlib]System.Threading.TimerCallback,
                                       object,
                                       int32,
                                       int32)
 IL_0019: stloc.0
 IL_001a: call    string [mscorlib]System.Console::ReadLine()
 IL_001f: pop
 IL_0020: ret
} // end of method Program::Main

class Program
  {
    static void Main(string[] args)
    {
      Timer timer = new Timer(TimerCallback,null,0,2000);
    
      Console.ReadLine();
      timer.Dispose();
    }

    private static void TimerCallback(object o)
    {
      Console.WriteLine("in TimerCallback method");

      GC.Collect();

      
    }
  }