C#浮点数的四舍五入

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace ConsoleApp4
{
    class Program
    {
        static void Main(string[] args)
        {
            string line = Console.ReadLine();
            double v = double.Parse(line);
            Console.WriteLine(Math.Round(v, 0, MidpointRounding.AwayFromZero));
            Console.ReadKey();
        }
    }
}