try…catch的成本到底有多高

int cout = 10000; 
  
            Stopwatch stopwatch = new Stopwatch(); 

  
            stopwatch.Start(); 

  
            for (int i = 0; i < cout; i++) 

  
            { 

  
                Dictionary<string, string> dic = new Dictionary<string, string>(); 

  
                    dic.Add("1", "2"); 

  
                    if (!dic.ContainsKey("1")) 

  
                    { 

  
                        dic.Add("1", "2"); 

  
                    } 

  
            } 

  
            stopwatch.Stop(); 

  
            Console.WriteLine(stopwatch.Elapsed); 

  
            stopwatch.Reset(); 

  
            stopwatch.Start(); 

  
            for (int i = 0; i < cout; i++) 

  
            { 

  
                Dictionary<string, string> dic = new Dictionary<string, string>(); 

  
                try 

  
                { 

  
                    dic.Add("1", "2"); 

  
                    dic.Add("1", "2"); 

  
                } 

  
                catch 

  
                { 

  
                }

            } 
stopwatch.Stop(); 

  Console.WriteLine(stopwatch.Elapsed); 

Console.ReadKey(true);   //output:

//00:00:00:0122448

//00:00:23.6119347