遍历文件和文件夹

1. public static IEnumerable<FileInfo> getFiles(DirectoryInfo d)
2. {
3.     return getFiles(d, "*.*");
4. }
5.  
6. /// <summary>
7. /// method for recursively getting all the files
8. /// in the provided directory
9. /// </summary>
10. /// <param name="d">DirectoryInfo we're looking at</param>
11. /// <param name="pattern">search patters (i.e; *.*)</param>
12. /// <returns></returns>
13. public static IEnumerable<FileInfo> getFiles(DirectoryInfo d, string pattern)
14. {
15.     //loop through the entire directory
16.     foreach (DirectoryInfo dirInfo in d.GetDirectories())
17.     {
18.         //loop through each file
19.         foreach (FileInfo f in getFiles(dirInfo, pattern))
20.             yield return f;
21.     }               
22.  
23.     foreach (FileInfo f in d.GetFiles(pattern))
24.         yield return f;
25. }