有时候需要将文件名按照数字大小排序,而不是按照字母顺序排序,例如:
Traditional Sort | Alphanum | |
1000X Radonius Maximus 10X Radonius 200X Radonius 20X Radonius 20X Radonius Prime 30X Radonius 40X Radonius Allegia 50 Clasteron Allegia 500 Clasteron Allegia 50B Clasteron Allegia 51 Clasteron Allegia 6R Clasteron Alpha 100 Alpha 2 Alpha 200 Alpha 2A Alpha 2A-8000 Alpha 2A-900 Callisto Morphamax Callisto Morphamax 500 Callisto Morphamax 5000 Callisto Morphamax 600 Callisto Morphamax 6000 SE Callisto Morphamax 6000 SE2 Callisto Morphamax 700 Callisto Morphamax 7000 Xiph Xlater 10000 Xiph Xlater 2000 Xiph Xlater 300 Xiph Xlater 40 Xiph Xlater 5 Xiph Xlater 50 Xiph Xlater 500 Xiph Xlater 5000 Xiph Xlater 58 | 10X Radonius 20X Radonius 20X Radonius Prime 30X Radonius 40X Radonius 200X Radonius 1000X Radonius Maximus Allegia 6R Clasteron Allegia 50 Clasteron Allegia 50B Clasteron Allegia 51 Clasteron Allegia 500 Clasteron Alpha 2 Alpha 2A Alpha 2A-900 Alpha 2A-8000 Alpha 100 Alpha 200 Callisto Morphamax Callisto Morphamax 500 Callisto Morphamax 600 Callisto Morphamax 700 Callisto Morphamax 5000 Callisto Morphamax 6000 SE Callisto Morphamax 6000 SE2 Callisto Morphamax 7000 Xiph Xlater 5 Xiph Xlater 40 Xiph Xlater 50 Xiph Xlater 58 Xiph Xlater 300 Xiph Xlater 500 Xiph Xlater 2000 Xiph Xlater 5000 Xiph Xlater 10000 |
在Windows XP及以后的系统中,通过修改注册表,或者使用组策略(实质上还是修改注册表),可以控制使用哪种排序方式,进行文件名排序。在
HKEY_LOCAL_MACHINE\SOFTWARE\Microsoft\Windows\CurrentVersion\Policies\Explorer下面创建
DWORD键:NoStrCmpLogical,然后设置值为1,禁止使用智能排序;设置为0,启用智能排序。
程序实现智能排序,有人已经写了,在这转一下C#实现。最后的参考列表中的网址上,有各种语言的实现方法。
/* * The Alphanum Algorithm is an improved sorting algorithm for strings * containing numbers. Instead of sorting numbers in ASCII order like * a standard sort, this algorithm sorts numbers in numeric order. * * The Alphanum Algorithm is discussed at http://www.DaveKoelle.com * * Based on the Java implementation of Dave Koelle's Alphanum algorithm. * Contributed by Jonathan Ruckwood <jonathan.ruckwood@gmail.com> * * Adapted by Dominik Hurnaus <dominik.hurnaus@gmail.com> to * - correctly sort words where one word starts with another word * - have slightly better performance * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * */ using System; using System.Collections; using System.Text; /* * Please compare against the latest Java version at http://www.DaveKoelle.com * to see the most recent modifications */ namespace AlphanumComparator { public class AlphanumComparator : IComparer { private enum ChunkType {Alphanumeric, Numeric}; private bool InChunk(char ch, char otherCh) { ChunkType type = ChunkType.Alphanumeric; if (char.IsDigit(otherCh)) { type = ChunkType.Numeric; } if ((type == ChunkType.Alphanumeric && char.IsDigit(ch)) || (type == ChunkType.Numeric && !char.IsDigit(ch))) { return false; } return true; } public int Compare(object x, object y) { String s1 = x as string; String s2 = y as string; if (s1 == null || s2 == null) { return 0; } int thisMarker = 0, thisNumericChunk = 0; int thatMarker = 0, thatNumericChunk = 0; while ((thisMarker < s1.Length) || (thatMarker < s2.Length)) { if (thisMarker >= s1.Length) { return -1; } else if (thatMarker >= s2.Length) { return 1; } char thisCh = s1[thisMarker]; char thatCh = s2[thatMarker]; StringBuilder thisChunk = new StringBuilder(); StringBuilder thatChunk = new StringBuilder(); while ((thisMarker < s1.Length) && (thisChunk.Length==0 ||InChunk(thisCh, thisChunk[0]))) { thisChunk.Append(thisCh); thisMarker++; if (thisMarker < s1.Length) { thisCh = s1[thisMarker]; } } while ((thatMarker < s2.Length) && (thatChunk.Length==0 ||InChunk(thatCh, thatChunk[0]))) { thatChunk.Append(thatCh); thatMarker++; if (thatMarker < s2.Length) { thatCh = s2[thatMarker]; } } int result = 0; // If both chunks contain numeric characters, sort them numerically if (char.IsDigit(thisChunk[0]) && char.IsDigit(thatChunk[0])) { thisNumericChunk = Convert.ToInt32(thisChunk.ToString()); thatNumericChunk = Convert.ToInt32(thatChunk.ToString()); if (thisNumericChunk < thatNumericChunk) { result = -1; } if (thisNumericChunk > thatNumericChunk) { result = 1; } } else { result = thisChunk.ToString().CompareTo(thatChunk.ToString()); } if (result != 0) { return result; } } return 0; } } }
参考:
http://www.davekoelle.com/alphanum.html