指定某个文件的创建 修改 访问时间

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
using System.IO;

namespace SetFileSystem
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        [DllImport("kernel32.dll", SetLastError = true)]
        [return: MarshalAs(UnmanagedType.Bool)]
        static extern bool SetFileTime(SafeHandle hFile, ref long lpCreationTime, ref long lpLastAccessTime, ref long lpLastWriteTime);

        public static void SetFileTimes(SafeHandle hFile, DateTime creationTime, DateTime accessTime, DateTime writeTime)
        {
            long lCreationTime = creationTime.ToFileTime();
            long lAccessTime = accessTime.ToFileTime();
            long lWriteTime = writeTime.ToFileTime();

            if (!SetFileTime(hFile, ref lCreationTime, ref lAccessTime, ref lWriteTime))
            {
                throw new Win32Exception();
            }
        }

        private void button1_Click(object sender, EventArgs e)
        {
            Microsoft.Win32.SafeHandles.SafeFileHandle handle;
            string path = "c:\\a.txt";
            FileStream stream = new FileStream(path, FileMode.Open, FileAccess.ReadWrite, FileShare.ReadWrite, 1);
            handle = stream.SafeFileHandle;
            if (!handle.IsInvalid)
            {
                DateTime dn = DateTime.Now;
                long dt = dn.ToFileTime();

                if (SetFileTime(handle, ref dt, ref dt, ref dt))
                {
                    MessageBox.Show("成功！");
                }
                else
                {
                    MessageBox.Show("失败！");
                }
            }
            stream.Close();

        }
    }
}