C# 文件夹，文件操作

FolderBrowserDialog fbd = new FolderBrowserDialog();
fbd.ShowDialog();
folderName = fbd.SelectedPath; //获得选择的文件夹路径

 FileStream fs = new FileStream(savePath,FileMode.Append);
 StreamWriter sw = new StreamWriter(fs);
 sw.WriteLine(builder.ToString());
 sw.Close();
 fs.Close();

 List<string> saveFlieName = new List<string>();
 DirectoryInfo TheFolder = new DirectoryInfo(filePath);
            //遍历文件
 saveFlieName.Clear();
 ReadFile rf = new ReadFile();
 foreach (FileInfo NextFile in TheFolder.GetFiles())
  saveFlieName.Add(NextFile.Name);