switch与if效率实例解析·5年以下编程经验必看【C#】

using System;
using System.Diagnostics;
namespace Action
{
    class Program
    {
        static void Main(string[] args)
        {
            Random ra = new Random();
            int count = 1000000;
            DateTime start = DateTime.Now;
            for (int i = 0; i < count; i++)
            {
                switch (ra.Next(10))
                {
                    case 0:break;
                    case 1:break;
                    case 2:break;
                    case 3:break;
                    case 4:break;
                    case 5:break;
                    case 6:break;
                    case 7:break;
                    case 8:break;
                    case 9:break;
                    default: break;
                }
            }
            DateTime end = DateTime.Now;
            double usedMemory = Process.GetCurrentProcess().WorkingSet64 / 1024.0 / 1024.0;
            Console.WriteLine("耗时："+(end-start).TotalMilliseconds+"毫秒");
            Console.WriteLine("消耗内存:"+ usedMemory+"M");
        }
    }
}

using System;
using System.Diagnostics;
namespace Action
{
    class Program
    {
        static void Main(string[] args)
        {
            Random ra = new Random();
            int count = 1000000;
            DateTime start = DateTime.Now;
            for (int i = 0; i < count; i++)
            {
                int v = ra.Next(10);
                if (v == 0)
                {
                }
                else if (v == 1)
                {
                }
                else if (v == 2)
                {
                }
                else if (v == 3)
                {
                }
                else if (v == 4)
                {
                }
                else if (v == 5)
                {
                }
                else if (v == 6)
                {
                }
                else if (v == 7)
                {
                }
                else if (v == 8)
                {
                }
                else if (v == 9)
                {
                }
            }
            DateTime end = DateTime.Now;
            double usedMemory = Process.GetCurrentProcess().WorkingSet64 / 1024.0 / 1024.0;
            Console.WriteLine("耗时：" + (end - start).TotalMilliseconds + "毫秒");
            Console.WriteLine("消耗内存:" + usedMemory + "M");
        }
    }
}