stringbuilderの実行効率をテストする例

 
  
//  StringBuilder      
  
        public static void Fun2() 
  
        { 
  
            #region string 
   
  
            string str = "     !";
 
  
            //         ，            。
            Stopwatch stopw = new Stopwatch();
 
  
            //                  。
            stopw.Start();
 
  
            for (int i = 0; i < 100000; i++)
            {
                str += "Test";
            }
 
  
            //               。
            stopw.Stop();
 
  
            Console.WriteLine("string     ：" + stopw.ElapsedMilliseconds.ToString() + "  ");
 
  
            #endregion
 
  
            #region StringBuilder
 
  
            StringBuilder sbuild = new StringBuilder("     ！");
 
  
            stopw.Reset();
            stopw.Start();
 
  
            for (int i = 0; i < 100000; i++)
            {
                sbuild.Append("Test");
            }
 
  
            //               。
            stopw.Stop();
 
  
            Console.WriteLine("StringBuilder     ：" + stopw.ElapsedMilliseconds.ToString() + "  ");
 
  
            #endregion
 
  
            #region       String
 
  
            String str2 = "     !";
            stopw.Reset();
            stopw.Start();
 
  
            for (int i = 0; i < 10000; i++)
            {
                str2 += "Test";
            }
 
  
            stopw.Stop();
            Console.WriteLine("String     ：" + stopw.ElapsedMilliseconds.ToString() + "  ");
 
  

            //    ：                             StringBuilder
            #endregion
        }