有没有办法从Directory.EnumerateFiles中的异常恢复？ [英] Is there a way of recover from an Exception in Directory.EnumerateFiles?

问题描述

在.NET 4中，有这个 Directory.EnumerateFiles（）方法与递归看起来很方便。

但是，如果在递归中发生异常，我该如何继续/恢复，继续枚举其余的文件？

In .NET 4, there's this Directory.EnumerateFiles() method with recursion that seems handy.
However, if an Exception occurs within a recursion, how can I continue/recover from that and continuing enumerate the rest of the files?

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);
}

推荐答案

这个。通过使用堆栈来推送枚举结果，确实可以处理异常。这是一个代码片段：（灵感来自这篇文章）

I did found a solution to this. By using a stack to push the enumeration results, one can indeed handle the exceptions. Here's a code snippet: (inspired by this article)

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);
}

这篇关于有没有办法从Directory.EnumerateFiles中的异常恢复？的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！