复制代码 代码如下:
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 0;
}
}
}

/// <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
}
}