本文最后更新于 over 3 years ago，文中所描述的信息可能已发生改变。
前言
在使用某些获取文件夹下的文件路径函数时，比如
Directory.GetFiles()、HOperatorSet.ListFiles()，是否会发现文件并不是我们所期望的顺序排列。正常【1_1、1_2、2_1、2_2…10_1、10_2…】 => 异常【10_1、10_2、11_1、11_2…1_1、1_2、2_1、2_2…】，属实是🕳
正文
你的轮子很好，但现在它是我的了（
csharp
using System;
using System.Collections;
using System.Collections.Generic;
namespace SkUtils
{
class FileComparer
{
public enum CharType
{
Number = 0,
Normal = 1
}
public class Model
{
private string _oValue;
public string oValue
{
set { _oValue = value; }
get { return _oValue; }
}
private CharType _cType;
public CharType cType
{
set { _cType = value; }
get { return _cType; }
}
public Model(string o, CharType c)
{
_oValue = o;
_cType = c;
}
}
public class FileNameComparer1 : IComparer
{
public int Compare(object a, object b)
{
string s1 = a.ToString();
string s2 = b.ToString();
if (s1.IndexOf('.') == -1 && s2.IndexOf('.') == -1)
{
return SubCompare(s1, s2);
}
else if (s1.IndexOf('.') != -1 && s2.IndexOf('.') != -1)
{
int pos1 = s1.IndexOf(".");
int pos2 = s2.IndexOf(".");
string ss1 = s1.Substring(0, pos1);
string ss2 = s2.Substring(0, pos2);
int result = SubCompare(ss1, ss2);
if (result == 0)
{
string is1 = s1.Substring(pos1 + 1);
string is2 = s2.Substring(pos2 + 1);
return SubCompare(is1, is2);
}
return result;
}
else
{
int pos1 = s1.IndexOf(".");
int pos2 = s2.IndexOf(".");
return pos1 > pos2 ? 1 : -1;
}
}
int SubCompare(string s1, string s2)
{
List<Model> q1 = null;
List<Model> q2 = null;
q1 = StoreQueue(s1);
q2 = StoreQueue(s2);
if (q1 == null)
return -1;
if (q2 == null)
return 1;
int len = q1.Count;
if (len > q2.Count)
len = q2.Count;
for (int i = 0; i < len; i++)
{
if (q1[i].cType != q2[i].cType)
{
return q1[i].oValue[0] > q2[i].oValue[0] ? 1 : -1;
}
else
{
if (q1[i].oValue == q2[i].oValue)
{
continue;
}
if (q1[i].cType == CharType.Number)
{
if (q1[i].oValue != q2[i].oValue)
{
int num1 = int.Parse(q1[i].oValue);
int num2 = int.Parse(q2[i].oValue);
return num1 > num2 ? 1 : -1;
}
}
else
{
if (q1[i].oValue != q2[i].oValue)
{
int rlen = q1[i].oValue.Length;
if (rlen > q2[i].oValue.Length)
rlen = q2[i].oValue.Length;
for (int j = 0; j < rlen; j++)
{
if (q1[i].oValue[j] != q2[i].oValue[j])
return q1[i].oValue[j] > q2[i].oValue[j] ? 1 : -1;
}
return q1[i].oValue.Length > q2[i].oValue.Length ? 1 : -1;
}
}
}
}
if (q1.Count != q2.Count)
return q1.Count > q2.Count ? 1 : -1;
else
return 0;
}
CharType GetCharType(char c)
{
if (c >= 48 && c <= 57)
return CharType.Number;
else return CharType.Normal;
}
public List<Model> StoreQueue(string str)
{
if (string.IsNullOrEmpty(str) || str.Length == 0)
{
return null;
}
List<Model> sl = new List<Model>();
Model m = null;
CharType ctype = GetCharType(str[0]);
if (str.Length == 1)
{
m = new Model(str, ctype);
sl.Add(m);
return sl;
}
int start = 0;
for (int i = 1; i < str.Length; i++)
{
if (GetCharType(str[i]) != ctype)
{
m = new Model(str.Substring(start, i - start), ctype);
sl.Add(m);
if (i == str.Length - 1)
{
CharType sType = GetCharType(str[i]);
m = new Model(str[i].ToString(), sType);
sl.Add(m);
}
else
{
ctype = GetCharType(str[i]);
start = i;
}
}
else
{
if (i == str.Length - 1)
{
CharType sType = GetCharType(str[i]);
m = new Model(str.Substring(start, i + 1 - start), sType);
sl.Add(m);
}
}
}
return sl;
}
}
// 用法如下
public static void Main(string[] args)
{
string[] filenames = new string[] { "IM1", "IM2", "IM3", "IM4", "IM5", "IM6", "IM7",
"IM8", "IM9", "IM10", "IM12", "IM11", "IM13", "IM20", "IM21", "IM22", "IM30", "IM100", "IM1000", "IM200", "IM234"};
Array.Sort(filenames, new FileNameComparer1());
foreach (string s in filenames)
{
Console.WriteLine(s);
}
Console.ReadLine();
}
}
}