这一个帮助我得到一个目录和子目录中的所有文件，可能对某人有帮助。[灵感来自上述答案]

static void Main(string[] args)
    {
        try
        {
            var root = @"G:\logs";
            DirectorySearch(root);
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }
        Console.ReadKey();
    }





public static void DirectorySearch(string root, bool isRootItrated = false)
{
    if (!isRootItrated)
    {
        var rootDirectoryFiles = Directory.GetFiles(root);
        foreach (var file in rootDirectoryFiles)
        {
            Console.WriteLine(file);
        } 
    }

    var subDirectories = Directory.GetDirectories(root);
    if (subDirectories?.Any() == true)
    {
        foreach (var directory in subDirectories)
        {
            var files = Directory.GetFiles(directory);
            foreach (var file in files)
            {
                Console.WriteLine(file);
            }
            DirectorySearch(directory, true);
        }
    }
}

在Framework 2.0中，你可以使用(它列出根文件夹的文件，这是最好的最流行的答案):

static void DirSearch(string dir)
{
    try
    {
        foreach (string f in Directory.GetFiles(dir))
            Console.WriteLine(f);
        foreach (string d in Directory.GetDirectories(dir))
        {
            Console.WriteLine(d);
            DirSearch(d);
        }

    }
    catch (System.Exception ex)
    {
        Console.WriteLine(ex.Message);
    }
}

Directory.GetFiles("C:\\", "*.*", SearchOption.AllDirectories)

一些很好的答案，但这些答案并没有解决我的问题。

一旦出现文件夹权限问题:“permission Denied”，代码就会失败。这是我用来解决“Permission Denied”问题的方法:

private int counter = 0;

    private string[] MyDirectories = Directory.GetDirectories("C:\\");

    private void ScanButton_Click(object sender, EventArgs e)
    {
        Thread MonitorSpeech = new Thread(() => ScanFiles());
        MonitorSpeech.Start();
    }

    private void ScanFiles()
    {
        string CurrentDirectory = string.Empty;

        while (counter < MyDirectories.Length)
        {
            try
            {
                GetDirectories();
                CurrentDirectory = MyDirectories[counter++];
            }
            catch
            {
                if (!this.IsDisposed)
                {
                    listBox1.Invoke((MethodInvoker)delegate { listBox1.Items.Add("Access Denied to : " + CurrentDirectory); });
                }
            }
        }
    }

    private void GetDirectories()
    {
        foreach (string directory in MyDirectories)
        {
            GetFiles(directory);
        }
    }

    private void GetFiles(string directory)
    {
        try
        {
            foreach (string file in Directory.GetFiles(directory, "*"))
            {
                listBox1.Invoke((MethodInvoker)delegate { listBox1.Items.Add(file); });
            }
        }
        catch
        {
            listBox1.Invoke((MethodInvoker)delegate { listBox1.Items.Add("Access Denied to : " + directory); });
        }
    }

希望这能帮助到其他人。

下面是B. Clay Shannon的非静态excel文件代码:

class ExcelSearcher
{
    private List<string> _fileNames;

    public ExcelSearcher(List<string> filenames)
    {
        _fileNames = filenames;
    }
    public List<string> GetExcelFiles(string dir, List<string> filenames = null)
    {

        string dirName = dir;
        var dirNames = new List<string>();
        if (filenames != null)
        {
            _fileNames.Concat(filenames);
        }
        try
        {
            foreach (string f in Directory.GetFiles(dirName))
            {
                if (f.ToLower().EndsWith(".xls") || f.ToLower().EndsWith(".xlsx"))
                {
                    _fileNames.Add(f);
                }
            }
            dirNames = Directory.GetDirectories(dirName).ToList();
            foreach (string d in dirNames)
            {
                GetExcelFiles(d, _fileNames);
            }
        }
        catch (Exception ex)
        {
            //Bam
        }
        return _fileNames;
    }

一个简单干净的解决方案

/// <summary>
/// Scans a folder and all of its subfolders recursively, and updates the List of files
/// </summary>
/// <param name="sFullPath">Full path of the folder</param>
/// <param name="files">The list, where the output is expected</param>
internal static void EnumerateFiles(string sFullPath, List<FileInfo> fileInfoList)
{
    try
    {
        DirectoryInfo di = new DirectoryInfo(sFullPath);
        FileInfo[] files = di.GetFiles();

        foreach (FileInfo file in files)
            fileInfoList.Add(file);

        //Scan recursively
        DirectoryInfo[] dirs = di.GetDirectories();
        if (dirs == null || dirs.Length < 1)
            return;
        foreach (DirectoryInfo dir in dirs)
            EnumerateFiles(dir.FullName, fileInfoList);

    }
    catch (Exception ex)
    {
        Logger.Write("Exception in Helper.EnumerateFiles", ex);
    }
}