System.IO.Directory.GetFiles的多个文件扩展名searchPattern

将多个文件扩展名设置为searchPatternon 的语法是什么Directory.GetFiles()？例如，筛选出扩展名为.aspx和.ascx的文件。

// TODO: Set the string 'searchPattern' to only get files with
// the extension '.aspx' and '.ascx'.
var filteredFiles = Directory.GetFiles(path, searchPattern);

更新：LINQ不是一个选项，它必须searchPattern传递给GetFiles，如问题中所指定。

我相信没有“开箱即用”的解决方案，这是Directory.GetFiles方法的局限性。

不过，编写一个自己的方法相当容易，这是一个示例。

代码可以是：

/// <summary>
/// Returns file names from given folder that comply to given filters
/// </summary>
/// <param name="SourceFolder">Folder with files to retrieve</param>
/// <param name="Filter">Multiple file filters separated by | character</param>
/// <param name="searchOption">File.IO.SearchOption, 
/// could be AllDirectories or TopDirectoryOnly</param>
/// <returns>Array of FileInfo objects that presents collection of file names that 
/// meet given filter</returns>
public string[] getFiles(string SourceFolder, string Filter, 
 System.IO.SearchOption searchOption)
{
 // ArrayList will hold all file names
ArrayList alFiles = new ArrayList();

 // Create an array of filter string
 string[] MultipleFilters = Filter.Split('|');

 // for each filter find mathing file names
 foreach (string FileFilter in MultipleFilters)
 {
  // add found file names to array list
  alFiles.AddRange(Directory.GetFiles(SourceFolder, FileFilter, searchOption));
 }

 // returns string array of relevant file names
 return (string[])alFiles.ToArray(typeof(string));
}

var filteredFiles = Directory
    .GetFiles(path, "*.*")
    .Where(file => file.ToLower().EndsWith("aspx") || file.ToLower().EndsWith("ascx"))
    .ToList();

编辑2014-07-23

您可以在.NET 4.5中执行此操作，以实现更快的枚举：

var filteredFiles = Directory
    .EnumerateFiles(path) //<--- .NET 4.5
    .Where(file => file.ToLower().EndsWith("aspx") || file.ToLower().EndsWith("ascx"))
    .ToList();

MSDN中的Directory.EnumerateFiles

GetFiles只能匹配一个模式，但是您可以使用Linq调用具有多个模式的GetFiles：

FileInfo[] fi = new string[]{"*.txt","*.doc"}
    .SelectMany(i => di.GetFiles(i, SearchOption.AllDirectories))
    .ToArray();

请在此处查看评论部分：http : //www.codeproject.com/KB/aspnet/NET_DirectoryInfo.aspx

我喜欢这种方法，因为它可读性强，并且避免了目录的多次迭代：

var allowedExtensions = new [] {".doc", ".docx", ".pdf", ".ppt", ".pptx", ".xls", ".xslx"}; 
var files = Directory
    .GetFiles(folder)
    .Where(file => allowedExtensions.Any(file.ToLower().EndsWith))
    .ToList();

我担心您将不得不做这样的事情，我从这里修改了正则表达式。

var searchPattern = new Regex(
    @"$(?<=\.(aspx|ascx))", 
    RegexOptions.IgnoreCase);
var files = Directory.EnumerateFiles(path)
    .Where(f => searchPattern.IsMatch(f))
    .ToList();

var filteredFiles = Directory
    .EnumerateFiles(path, "*.*") // .NET4 better than `GetFiles`
    .Where(
        // ignorecase faster than tolower...
        file => file.ToLower().EndsWith("aspx")
        || file.EndsWith("ascx", StringComparison.OrdinalIgnoreCase))
    .ToList();

• 不要忘记使用新的.NET4 Directory.EnumerateFiles来提高性能（Directory.EnumerateFiles与Directory.GetFiles之间有什么区别？）
• “ IgnoreCase”应该比“ ToLower”更快

或者，拆分和合并您的glob可能更快（至少看起来更干净）：

"*.ext1;*.ext2".Split(';')
    .SelectMany(g => Directory.EnumerateFiles(path, g))
    .ToList();

易于记忆，懒惰甚至不完美的解决方案：

Directory.GetFiles(dir, "*.dll").Union(Directory.GetFiles(dir, "*.exe"))

我将使用以下内容：

var ext = new string[] { ".ASPX", ".ASCX" };
FileInfo[] collection = (from fi in new DirectoryInfo(path).GetFiles()
                         where ext.Contains(fi.Extension.ToUpper())
                         select fi)
                         .ToArray();

编辑：更正了Directory和DirectoryInfo之间的应有不匹配

一种具有扩展名“ .aspx”和“ .ascx”的文件的更有效的方法是避免使用多次查询文件系统并避免返回大量不需要的文件，这是通过使用近似搜索模式对文件进行预过滤的，之后完善结果：

var filteredFiles = Directory.GetFiles(path, "*.as?x")
    .Select(f => f.ToLowerInvariant())
    .Where(f => f.EndsWith("px") || f.EndsWith("cx"))
    .ToList();

我会尝试指定类似

var searchPattern = "as?x";

它应该工作。

    /// <summary>
    /// Returns the names of files in a specified directories that match the specified patterns using LINQ
    /// </summary>
    /// <param name="srcDirs">The directories to seach</param>
    /// <param name="searchPatterns">the list of search patterns</param>
    /// <param name="searchOption"></param>
    /// <returns>The list of files that match the specified pattern</returns>
    public static string[] GetFilesUsingLINQ(string[] srcDirs,
         string[] searchPatterns,
         SearchOption searchOption = SearchOption.AllDirectories)
    {
        var r = from dir in srcDirs
                from searchPattern in searchPatterns
                from f in Directory.GetFiles(dir, searchPattern, searchOption)
                select f;

        return r.ToArray();
    }

    public static bool CheckFiles(string pathA, string pathB)
    {
        string[] extantionFormat = new string[] { ".war", ".pkg" };
        return CheckFiles(pathA, pathB, extantionFormat);
    }
    public static bool CheckFiles(string pathA, string pathB, string[] extantionFormat)
    {
        System.IO.DirectoryInfo dir1 = new System.IO.DirectoryInfo(pathA);
        System.IO.DirectoryInfo dir2 = new System.IO.DirectoryInfo(pathB);
        // Take a snapshot of the file system. list1/2 will contain only WAR or PKG 
        // files
        // fileInfosA will contain all of files under path directories 
        FileInfo[] fileInfosA = dir1.GetFiles("*.*", 
                              System.IO.SearchOption.AllDirectories);
        // list will contain all of files that have ..extantion[]  
        // Run on all extantion in extantion array and compare them by lower case to 
        // the file item extantion ...
        List<System.IO.FileInfo> list1 = (from extItem in extantionFormat
                                          from fileItem in fileInfosA
                                          where extItem.ToLower().Equals 
                                          (fileItem.Extension.ToLower())
                                          select fileItem).ToList();
        // Take a snapshot of the file system. list1/2 will contain only WAR or  
        // PKG files
        // fileInfosA will contain all of files under path directories 
        FileInfo[] fileInfosB = dir2.GetFiles("*.*", 
                                       System.IO.SearchOption.AllDirectories);
        // list will contain all of files that have ..extantion[]  
        // Run on all extantion in extantion array and compare them by lower case to 
        // the file item extantion ...
        List<System.IO.FileInfo> list2 = (from extItem in extantionFormat
                                          from fileItem in fileInfosB
                                          where extItem.ToLower().Equals            
                                          (fileItem.Extension.ToLower())
                                          select fileItem).ToList();
        FileCompare myFileCompare = new FileCompare();
        // This query determines whether the two folders contain 
        // identical file lists, based on the custom file comparer 
        // that is defined in the FileCompare class. 
        return list1.SequenceEqual(list2, myFileCompare);
    }

代替EndsWith函数，我将选择使用该Path.GetExtension()方法。这是完整的示例：

var filteredFiles = Directory.EnumerateFiles( path )
.Where(
    file => Path.GetExtension(file).Equals( ".aspx", StringComparison.OrdinalIgnoreCase ) ||
            Path.GetExtension(file).Equals( ".ascx", StringComparison.OrdinalIgnoreCase ) );

要么：

var filteredFiles = Directory.EnumerateFiles(path)
.Where(
    file => string.Equals( Path.GetExtension(file), ".aspx", StringComparison.OrdinalIgnoreCase ) ||
            string.Equals( Path.GetExtension(file), ".ascx", StringComparison.OrdinalIgnoreCase ) );

（StringComparison.OrdinalIgnoreCase如果您关心性能，请使用：MSDN字符串比较）

看起来像这个演示：

void Main()
{
    foreach(var f in GetFilesToProcess("c:\\", new[] {".xml", ".txt"}))
        Debug.WriteLine(f);
}
private static IEnumerable<string> GetFilesToProcess(string path, IEnumerable<string> extensions)
{
   return Directory.GetFiles(path, "*.*")
       .Where(f => extensions.Contains(Path.GetExtension(f).ToLower()));
}

@Daniel B，感谢您提出编写我自己的此函数版本的建议。它具有与Directory.GetFiles相同的行为，但支持正则表达式过滤。

string[] FindFiles(FolderBrowserDialog dialog, string pattern)
    {
        Regex regex = new Regex(pattern);

        List<string> files = new List<string>();
        var files=Directory.GetFiles(dialog.SelectedPath);
        for(int i = 0; i < files.Count(); i++)
        {
            bool found = regex.IsMatch(files[i]);
            if(found)
            {
                files.Add(files[i]);
            }
        }

        return files.ToArray();
    }

我发现它很有用，所以我想分享一下。

@ qfactor77答案的C＃版本。这是没有LINQ的最佳方法。

string[] wildcards= {"*.mp4", "*.jpg"};
ReadOnlyCollection<string> filePathCollection = FileSystem.GetFiles(dirPath, Microsoft.VisualBasic.FileIO.SearchOption.SearchAllSubDirectories, wildcards);
string[] filePath=new string[filePathCollection.Count];
filePathCollection.CopyTo(filePath,0);

现在返回filePath字符串数组。一开始你需要

using Microsoft.VisualBasic.FileIO;
using System.Collections.ObjectModel;

您还需要添加参考 Microsoft.VisualBasic

我做了一个简单的方法来查找所需的扩展，并且没有ToLower（），RegEx，foreach ...

List<String> myExtensions = new List<String>() { ".aspx", ".ascx", ".cs" }; // You can add as many extensions as you want.
DirectoryInfo myFolder = new DirectoryInfo(@"C:\FolderFoo");
SearchOption option = SearchOption.TopDirectoryOnly; // Use SearchOption.AllDirectories for seach in all subfolders.
List<FileInfo> myFiles = myFolder.EnumerateFiles("*.*", option)
    .Where(file => myExtensions
    .Any(e => String.Compare(file.Extension, e, CultureInfo.CurrentCulture, CompareOptions.IgnoreCase) == 0))
    .ToList();

在.Net Standard 2.0上工作。

你可以这样

new DirectoryInfo(path).GetFiles().Where(Current => Regex.IsMatch(Current.Extension, "\\.(aspx|ascx)", RegexOptions.IgnoreCase)

var filtered = Directory.GetFiles(path)
    .Where(file => file.EndsWith("aspx", StringComparison.InvariantCultureIgnoreCase) || file.EndsWith("ascx", StringComparison.InvariantCultureIgnoreCase))
    .ToList();

只是想说，如果您使用FileIO.FileSystem.GetFiles而不是Directory.GetFiles，它将允许使用通配符数组。

例如：

Dim wildcards As String() = {"*.html", "*.zip"}
Dim ListFiles As List(Of String) = FileIO.FileSystem.GetFiles(directoryyouneed, FileIO.SearchOption.SearchTopLevelOnly, wildcards).ToList