有没有办法从Directory.EnumerateFiles中的异常中恢复？

Question

在.NET 4中,这个带有递归的Directory.EnumerateFiles()方法看起来很方便.
但是,如果在递归中发生异常,我如何继续/从中恢复并继续枚举其余文件？

try
{
  var files = from file in Directory.EnumerateFiles("c:\\",
                           "*.*", SearchOption.AllDirectories)
              select new
              {
                File = file
              };

  Console.WriteLine(files.Count().ToString());

}
catch (UnauthorizedAccessException uEx)
{
  Console.WriteLine(uEx.Message);
}
catch (PathTooLongException ptlEx)
{
  Console.WriteLine(ptlEx.Message);
}

Answer 1

我确实找到了解决这个问题的方法。通过使用堆栈来压入枚举结果，确实可以处理异常。这是一个代码片段：（受本文启发）

List<string> results = new List<string>();
string start = "c:\\";
results.Add(start);
Stack<string> stack = new Stack<string>();

do
{
  try
  {
    var dirs = from dir in Directory.EnumerateDirectories(
                     start, "*.*", SearchOption.TopDirectoryOnly)
                select dir;

    Array.ForEach(dirs.ToArray(), stack.Push);
    start = stack.Pop();
    results.Add(start);
  }
  catch (UnauthorizedAccessException ex)
  {
    Console.WriteLine(ex.Message);
    start = stack.Pop();
    results.Add(start);
  }

} while (stack.Count != 0);

foreach (string file in results)
{
  Console.WriteLine(file);
}