LinqPad FileIO Extensions

LinqPad.FileIo

public static class FileIO
{
  private static string LastDirectoryKey  = "extensions.fileio.lastdirectory";

    public static IEnumerable<string> GetFilesRecursivelyFromDirectory(string directory)
    {
      return Directory.EnumerateFiles(directory).Concat(
             Directory.EnumerateDirectories(directory)
                      .SelectMany(subdir => GetFilesRecursivelyFromDirectory(subdir)));
    }
    
    // This doesn't work, and I haven't taken the time to figure out why...
    public static IEnumerable<string> GetDirectoriesRecursively(string directory)
    {
     return Directory.EnumerateDirectories(directory).SelectMany (subDir => GetDirectoriesRecursively(subDir));
    }

    public static string GetFile()
    {
    var initialDirectory = Util.GetPassword(LastDirectoryKey);
    
    if (string.IsNullOrWhiteSpace(initialDirectory))
    initialDirectory = System.Environment.GetFolderPath(Environment.SpecialFolder.CommonDocuments);
    
        var ofd = new System.Windows.Forms.OpenFileDialog()
        {
            CheckFileExists = true,
            InitialDirectory = initialDirectory
        };
	
        var result = ofd.ShowDialog();
    
        if (result != System.Windows.Forms.DialogResult.OK)
	      {
            throw new Exception("Open file was cancelled.");
    	  }
    
        var fileName = ofd.FileName;
        
        var directory = System.IO.Directory.GetParent(fileName);
        
        Util.SetPassword(LastDirectoryKey, directory.FullName);
    
        if (string.IsNullOrWhiteSpace(fileName) || !System.IO.File.Exists(fileName))
        {
            throw new Exception("Unable to get file: " + fileName);
        }
        
        Trace.WriteLine("File found: " + fileName);
    
        return fileName;
    }
    
    public static IEnumerable<string> GetFiles(bool log = false)
    {
        var ofd = new System.Windows.Forms.OpenFileDialog()
        {
            CheckFileExists = true,
            Multiselect = true,
            InitialDirectory = System.Environment.GetFolderPath(Environment.SpecialFolder.CommonDocuments)
        };
	
        var result = ofd.ShowDialog();
    
        if (result != System.Windows.Forms.DialogResult.OK)
	      {
            throw new Exception("Open file was cancelled.");
    	  }
    
        var fileNames = ofd.FileNames;
        
        for (int i = 0; i < fileNames.Count(); i++ )
        {
          var fileName = fileNames[i];
         
          if (string.IsNullOrWhiteSpace(fileName) || !System.IO.File.Exists(fileName))
          {
            throw new Exception("Unable to get file: " + fileName);
          }
          
        
          Trace.WriteLine("File found: " + fileName);
        }
    
        return fileNames;
    
    }
    
  public static async Task ProcessLinesAsync(string fileName, Action<string> action)
  {
    using (var s = new StreamReader(fileName))
    {
      string line;
    
      while((line = await s.ReadLineAsync()) != null)
      {
        action.Invoke(line);
      }
    }
  }

  public static async Task ProcessLinesAsync(string fileName, Func<string, Task> action)
  {
    using (var s = new StreamReader(fileName))
    {
      string line;
    
      while((line = await s.ReadLineAsync()) != null)
      {
        await action.Invoke(line);
      }
    }
  }
}