我正在尝试使用Directory.GetFiles()方法来检索多种类型的文件列表，例如mp3和jpg。我没有运气就尝试了以下两种方法：

Directory.GetFiles("C:\path", "*.mp3|*.jpg", SearchOption.AllDirectories);
Directory.GetFiles("C:\path", "*.mp3;*.jpg", SearchOption.AllDirectories);

有没有办法在一个电话中做到这一点？

解决方案

没有。请尝试以下方法：

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

是的...我相信我们必须拨打任意数量的所需文件类型。

我将自己创建一个函数，在具有所需扩展名的字符串上获取数组，然后在该数组上进行迭代以进行所有必要的调用。该函数将返回与我发送的扩展名匹配的文件的一般列表。

希望能帮助到你。

对于.NET 4.0及更高版本，

var files = Directory.EnumerateFiles("C:\path", "*.*", SearchOption.AllDirectories)
            .Where(s => s.EndsWith(".mp3") || s.EndsWith(".jpg"));

对于早期版本的.NET，

var files = Directory.GetFiles("C:\path", "*.*", SearchOption.AllDirectories)
            .Where(s => s.EndsWith(".mp3") || s.EndsWith(".jpg"));

编辑：请阅读评论。 Paul Farry建议的改进以及Christian.K指出的内存/性能问题都很重要。

刚刚找到了另一种方法来做到这一点。仍然不是一项手术，而是将其抛出来看看其他人对此有何看法。

private void getFiles(string path)
{
    foreach (string s in Array.FindAll(Directory.GetFiles(path, "*", SearchOption.AllDirectories), predicate_FileMatch))
    {
        Debug.Print(s);
    }
}

private bool predicate_FileMatch(string fileName)
{
    if (fileName.EndsWith(".mp3"))
        return true;
    if (fileName.EndsWith(".jpg"))
        return true;
    return false;
}

以下函数搜索多个模式，并用逗号分隔。我们也可以指定排除，例如："！web.config"将搜索所有文件，而排除" web.config"。模式可以混合。

private string[] FindFiles(string directory, string filters, SearchOption searchOption)
{
    if (!Directory.Exists(directory)) return new string[] { };

    var include = (from filter in filters.Split(new char[] { ',' }, StringSplitOptions.RemoveEmptyEntries) where !string.IsNullOrEmpty(filter.Trim()) select filter.Trim());
    var exclude = (from filter in include where filter.Contains(@"!") select filter);

    include = include.Except(exclude);

    if (include.Count() == 0) include = new string[] { "*" };

    var rxfilters = from filter in exclude select string.Format("^{0}$", filter.Replace("!", "").Replace(".", @"\.").Replace("*", ".*").Replace("?", "."));
    Regex regex = new Regex(string.Join("|", rxfilters.ToArray()));

    List<Thread> workers = new List<Thread>();
    List<string> files = new List<string>();

    foreach (string filter in include)
    {
        Thread worker = new Thread(
            new ThreadStart(
                delegate
                {
                    string[] allfiles = Directory.GetFiles(directory, filter, searchOption);
                    if (exclude.Count() > 0)
                    {
                        lock (files)
                            files.AddRange(allfiles.Where(p => !regex.Match(p).Success));
                    }
                    else
                    {
                        lock (files)
                            files.AddRange(allfiles);
                    }
                }
            ));

        workers.Add(worker);

        worker.Start();
    }

    foreach (Thread worker in workers)
    {
        worker.Join();
    }

    return files.ToArray();

}

用法：

foreach (string file in FindFiles(@"D:8.2.11", @"!*.config, !*.js", SearchOption.AllDirectories))
            {
                Console.WriteLine(file);
            }

让

var set = new HashSet<string> { ".mp3", ".jpg" };

然后

Directory.GetFiles(path, "*.*", SearchOption.AllDirectories)
         .Where(f => set.Contains(
             new FileInfo(f).Extension,
             StringComparer.OrdinalIgnoreCase));

或者

from file in Directory.GetFiles(path, "*.*", SearchOption.AllDirectories)
from ext in set
where String.Equals(ext, new FileInfo(file).Extension, StringComparison.OrdinalIgnoreCase)
select file;

List<string> FileList = new List<string>();
DirectoryInfo di = new DirectoryInfo("C:\DirName");

IEnumerable<FileInfo> fileList = di.GetFiles("*.*");

//Create the query
IEnumerable<FileInfo> fileQuery = from file in fileList
                                  where (file.Extension.ToLower() == ".jpg" || file.Extension.ToLower() == ".png")
                                  orderby file.LastWriteTime
                                  select file;

foreach (System.IO.FileInfo fi in fileQuery)
{
    fi.Attributes = FileAttributes.Normal;
    FileList.Add(fi.FullName);
}