C# 如何获得文件修改时间

1、using System;

using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.IO;
namespace csharpnouse
{
    class Program
    {
        static void Main(string[] args)
        {
            FileInfo fi = new FileInfo(@"d:\1.txt");
            Console.WriteLine(fi.LastWriteTime.ToString("yyyy-MM-dd HH:mm:ss"));
            Console.ReadKey();
        }
    }
}