DirectInfo.GetFiles返回数组的默认排序

NTFS和CDFS下，是按照字母顺序，而FAT下，按照文件创建时间顺序

 using System;
 using System.Collections;
 using System.IO;

 namespace ConsoleApplication1
 {
     /// <summary>
     /// 文件排序类
     /// </summary>
     public class FileSort : IComparer
     {
         private FileOrder _fileorder;
         private FileAsc _fileasc;

         /// <summary>
         /// 构造函数
         /// </summary>
         public FileSort()
             : this(FileOrder.Name, FileAsc.Asc)
         { }

         /// <summary>
         /// 构造函数
         /// </summary>
         /// <param name="fileorder"></param>
         public FileSort(FileOrder fileorder)
             : this(fileorder, FileAsc.Asc)
         { }

         /// <summary>
         /// 构造函数
         /// </summary>
         /// <param name="fileorder"></param>
         /// <param name="fileasc"></param>
         public FileSort(FileOrder fileorder, FileAsc fileasc)
         {
             _fileorder = fileorder;
             _fileasc = fileasc;
         }

         /// <summary>
         /// 比较函数
         /// </summary>
         /// <param name="x"></param>
         /// <param name="y"></param>
         /// <returns></returns>
         public int Compare(object x, object y)
         {
             FileInfo file1 = x as FileInfo;
             FileInfo file2 = y as FileInfo;
             FileInfo file3;

             if (file1 == null || file2 == null)
                 throw new ArgumentException("参数不是FileInfo类实例.");

             if (_fileasc == FileAsc.Desc)
             {
                 file3 = file1;
                 file1 = file2;
                 file2 = file3;
             }

             switch (_fileorder)
             {
                 case FileOrder.Name:
                     return file1.Name.CompareTo(file2.Name);
                 case FileOrder.Length:
                     return file1.Length.CompareTo(file2.Length);
                 case FileOrder.Extension:
                     return file1.Extension.CompareTo(file2.Extension);
                 case FileOrder.CreationTime:
                     return file1.CreationTime.CompareTo(file2.CreationTime);
                 case FileOrder.LastAccessTime:
                     return file1.LastAccessTime.CompareTo(file2.LastAccessTime);
                 case FileOrder.LastWriteTime:
                     return file1.LastWriteTime.CompareTo(file2.LastWriteTime);
                 default:
                     return ;
             }
         }
     }

     /// <summary>
     /// 排序依据
     /// </summary>
     public enum FileOrder
     {
         /// <summary>
         /// 文件名
         /// </summary>
         Name,
         /// <summary>
         /// 大小
         /// </summary>
         Length,
         /// <summary>
         /// 类型
         /// </summary>
         Extension,
         /// <summary>
         /// 创建时间
         /// </summary>
         CreationTime,
         /// <summary>
         /// 访问时间
         /// </summary>
         LastAccessTime,
         /// <summary>
         /// 修改时间
         /// </summary>
         LastWriteTime
     }

     /// <summary>
     /// 升序降序
     /// </summary>
     public enum FileAsc
     {
         /// <summary>
         /// 升序
         /// </summary>
         Asc,
         /// <summary>
         /// 降序
         /// </summary>
         Desc
     }
 }

 using System;
 using System.IO;

 namespace ConsoleApplication1
 {
     class Program
     {
         static void Main(string[] args)
         {
             DirectoryInfo dirInfo = new DirectoryInfo(@"F:\abc");
             FileInfo[] lstFile = dirInfo.GetFiles();
             Array.Sort(lstFile, new FileSort(FileOrder.LastWriteTime)); //按修改日期升序排列
             foreach (FileInfo file in lstFile)
                 Console.WriteLine(file.Name);

             Console.Read();

         }
     }
 }