String与StringBuilder性能比较

在大量数据的情况下，两者的差距就明显了！

            String str1 = String.Empty;
            StringBuilder sb1 = new StringBuilder();


            Stopwatch watch1 = new Stopwatch();
            watch1.Start();

            for (var i = 0; i < 100000; i++)
            {
                str1 += "add" + i.ToString();
            }
            watch1.Stop();

            Stopwatch watch2 = new Stopwatch();
            watch2.Start();

            for (var i = 0; i < 100000; i++)
            {
                sb1.Append("add" + i.ToString());
            }
            watch2.Stop();


            Console.WriteLine("Reflection: " + watch1.Elapsed);
            Console.WriteLine("Reflection: " + watch2.Elapsed);

            Console.ReadLine();

结果为

Reflection: 00:02:09.5819695

Reflection: 00:00:00.0659941

在10000次的性能上，都在10倍左右，但都小于0。1秒