使用正则表达式：

  Regex regex = new Regex(@"^.*(?_w_Drive(?d+)(?_i(?d+))?).[^.]+$"); var results = from file in fileList let match = regex.Match(file.Name) let IsMainBackup = !match.Groups["Increment"].Success let ImageNumber = match.Groups["ImageNumber"].Value let IncrementNumber = match.Groups["IncrementNumber"].Value where match.Groups["Backup"].Success orderby file.CreationTime select new { file.Name, file.CreationTime, file.Length, IsMainBackup, ImageNumber, IncrementNumber }; 

以下是正则表达式的说明：

 ^ Start of string. .* Allow anything at the start. (?...) Match a backup description (explained below). . Match a literal period. [^.]+$ Match the extension (anything except periods). $ End of string. 

备份是：

 _w_Drive A literal underscore, any letter, another underscore, then the string "Drive". (?d+) At least one digit, saved as ImageNumber. (?...)? An optional increment description. 

增量是：

 _i A literal underscore, then the letter i. (?d+) At least one digit, saved as IncrementNumber. 

这是我使用的测试代码：

 using System; using System.IO; using System.Text.RegularExpressions; using System.Linq; class Program { static void Main(string[] args) { FileInfo[] fileList = new FileInfo[] { new FileInfo("AWS025.sv2i"), new FileInfo("AWS025_C_Drive038.v2i"), new FileInfo("AWS025_C_Drive038_i001.iv2i"), new FileInfo("AWS025_C_Drive038_i002.iv2i"), new FileInfo("AWS025_C_Drive038_i003.iv2i"), new FileInfo("AWS025_C_Drive038_i004.iv2i"), new FileInfo("AWS025_C_Drive038_i005.iv2i") }; Regex regex = new Regex(@"^.*(?_w_Drive(?d+)(?_i(?d+))?).[^.]+$"); var results = from file in fileList let match = regex.Match(file.Name) let IsMainBackup = !match.Groups["Increment"].Success let ImageNumber = match.Groups["ImageNumber"].Value let IncrementNumber = match.Groups["IncrementNumber"].Value where match.Groups["Backup"].Success orderby file.CreationTime select new { file.Name, file.CreationTime, IsMainBackup, ImageNumber, IncrementNumber }; foreach (var x in results) { Console.WriteLine("Name: {0}, Main: {1}, Image: {2}, Increment: {3}", x.Name, x.IsMainBackup, x.ImageNumber, x.IncrementNumber); } } } 

这是我得到的输出：

 Name: AWS025_C_Drive038.v2i, Main: True, Image: 038, Increment: Name: AWS025_C_Drive038_i001.iv2i, Main: False, Image: 038, Increment: 001 Name: AWS025_C_Drive038_i002.iv2i, Main: False, Image: 038, Increment: 002 Name: AWS025_C_Drive038_i003.iv2i, Main: False, Image: 038, Increment: 003 Name: AWS025_C_Drive038_i004.iv2i, Main: False, Image: 038, Increment: 004 Name: AWS025_C_Drive038_i005.iv2i, Main: False, Image: 038, Increment: 005 

为这个问题找到一个好的答案真是太有趣了:)

下面的代码为您提供所需。 请注意在检索文件时使用搜索模式 – 没有必要检索更多文件。 另请注意parseNumber（）函数的使用，这只是为了向您展示如何以正确的格式将字符串结果从正则表达式更改为数字。

 static class Program { [STAThread] static void Main() { Application.EnableVisualStyles(); Application.SetCompatibleTextRenderingDefault(false); //Application.Run(new Form1()); GetBackupFiles(@"c:tempbackup files"); } static void GetBackupFiles(string path) { FileInfo[] fileList = new DirectoryInfo(path).GetFiles("*_Drive*.*v2i"); var results = from file in fileList orderby file.CreationTime select new { file.Name ,file.CreationTime ,file.Length ,IsMainBackup = file.Extension.ToLower() == ".v2i" ,ImageNumber = Regex.Match(file.Name, @"drive([d]{0,5})", RegexOptions.IgnoreCase).Groups[1] ,IncrementNumber = parseNumber( Regex.Match(file.Name, @"_i([d]{0,5}).iv2i", RegexOptions.IgnoreCase).Groups[1]) }; foreach (var x in results) Console.WriteLine(x.Name); } static int? parseNumber(object num) { int temp; if (num != null && int.TryParse(num.ToString(), out temp)) return temp; return null; } } 

请注意，对于正则表达式，我假设文件名中有一些一致性，如果它们偏离了您提到的格式，那么您将不得不调整它们。

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