我知道这是一个老问题，但LINQ:(.NET40+)

var files = Directory.GetFiles("path_to_files").Where(file => Regex.IsMatch(file, @"^.+\.(wav|mp3|txt)$"));

没有。试试下面的方法:

List<string> _searchPatternList = new List<string>();
    ...
    List<string> fileList = new List<string>();
    foreach ( string ext in _searchPatternList )
    {
        foreach ( string subFile in Directory.GetFiles( folderName, ext  )
        {
            fileList.Add( subFile );
        }
    }

    // Sort alpabetically
    fileList.Sort();

    // Add files to the file browser control    
    foreach ( string fileName in fileList )
    {
        ...;
    }

摘自:http://blogs.msdn.com/markda/archive/2006/04/20/580075.aspx

这个怎么样:

private static string[] GetFiles(string sourceFolder, string filters, System.IO.SearchOption searchOption)
{
   return filters.Split('|').SelectMany(filter => System.IO.Directory.GetFiles(sourceFolder, filter, searchOption)).ToArray();
}

我在这里(评论中)找到了它:http://msdn.microsoft.com/en-us/library/wz42302f.aspx

Let

var set = new HashSet<string>(
    new[] { ".mp3", ".jpg" },
    StringComparer.OrdinalIgnoreCase); // ignore case
var dir = new DirectoryInfo(path);

Then

dir.EnumerateFiles("*.*", SearchOption.AllDirectories)
   .Where(f => set.Contains(f.Extension));

or

from file in dir.EnumerateFiles("*.*", SearchOption.AllDirectories)
from ext in set // makes sense only if it's just IEnumerable<string> or similar
where String.Equals(ext, file.Extension, StringComparison.OrdinalIgnoreCase)
select file;

for

var exts = new[] { "mp3", "jpg" };

你可以:

public IEnumerable<string> FilterFiles(string path, params string[] exts) {
    return
        Directory
        .EnumerateFiles(path, "*.*")
        .Where(file => exts.Any(x => file.EndsWith(x, StringComparison.OrdinalIgnoreCase)));
}

不要忘记新的。net 4目录。EnumerateFiles用于性能提升(目录和文件的区别是什么?EnumerateFiles vs Directory.GetFiles?) “IgnoreCase”应该比“ToLower”(。EndsWith("aspx"， stringcompare . ordinalignorecase)而不是。tolower ().EndsWith("aspx"))

但EnumerateFiles的真正好处体现在你拆分过滤器并合并结果时:

public IEnumerable<string> FilterFiles(string path, params string[] exts) {
    return 
        exts.Select(x => "*." + x) // turn into globs
        .SelectMany(x => 
            Directory.EnumerateFiles(path, x)
            );
}

如果你不需要将它们转换为glob(即exts = new[] {"*.mp3"， "*.jpg"})，它会变得更快一些。

基于以下LinqPad测试的性能评估(注意:Perf只是重复委托10000次) https://gist.github.com/zaus/7454021

(从'duplicate'重新发布和扩展，因为这个问题特别要求没有LINQ:多个文件扩展searchPattern for System.IO.Directory.GetFiles)

还有一个下降解决方案，似乎没有任何内存或性能开销，而且相当优雅:

string[] filters = new[]{"*.jpg", "*.png", "*.gif"};
string[] filePaths = filters.SelectMany(f => Directory.GetFiles(basePath, f)).ToArray();