string 和 stringBuilder在创建字符串的效率比较代码

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System.Text.StringBuilder sb = new System.Text.StringBuilder();
            int i = 0;
            long StartTime = DateTime.Now.Ticks;
            while ( i < 100000 ) {
                sb.Append( i.ToString() );
                i++;
            }
            long EndTime = DateTime.Now.Ticks;
            Console.WriteLine( "时间:" + ( EndTime-StartTime ) + "/t Capacity:"+ sb.Capacity + "/t Length:" + sb.Length);

            System.Text.StringBuilder sb1 = new System.Text.StringBuilder();
            i = 0;
            StartTime = DateTime.Now.Ticks;
            while (i < 100000)
            {
                if ( sb1.Capacity <= sb1.Length )//先判断是否>Length
                    sb1.Capacity += 7;//这里一定要根据情况的增加容量,否则会有性能上的消耗
                sb1.Append( i.ToString() );
                i++;
            }
            EndTime = DateTime.Now.Ticks;
            Console.WriteLine( "时间:" + ( EndTime-StartTime ) + "/t Capacity:"+ sb1.Capacity + "/t Length:" + sb1.Length);

            string str = "";
            i = 0;
            StartTime = DateTime.Now.Ticks;
            while (i < 100000)
            {
                str += i.ToString();
                i++;
            }
            EndTime = DateTime.Now.Ticks;
            Console.WriteLine("时间:" + (EndTime - StartTime));

Console.Read();