UnauthorizedAccessException无法解决Directory.GetFiles失败 [英] UnauthorizedAccessException cannot resolve Directory.GetFiles failure

问题描述

Directory.GetFiles方法的第一次相遇失败，一个文件夹它没有访问权限。

Directory.GetFiles method fails on the first encounter with a folder it has no access rights to.

该方法将引发UnauthorizedAccessException（可捕获），但这样做的时候，该方法已经失败/终止。

The method throws an UnauthorizedAccessException (which can be caught) but by the time this is done, the method has already failed/terminated.

在code我现在用的就是如下：

The code I am using is listed below:

        try
        {
            // looks in stated directory and returns the path of all files found                
            getFiles = Directory.GetFiles(@directoryToSearch, filetype, SearchOption.AllDirectories);             
        }
        catch (UnauthorizedAccessException) { }

据我所知，是没有办法事先检查某个文件夹是否已经定义了访问权限。

As far as I am aware, there is no way to check beforehand whether a certain folder has access rights defined.

在我的例子，我在寻找一个磁盘上在网络上，当我遇到一个root权限的文件夹，我的计划失败。

In my example, I'm searching on a disk across a network and when I come across a root access only folder, my program fails.

推荐答案

在为了获得对所需的电平控制，你应该探测一次一个目录，而不是一整棵树。下面的方法填充给定的的IList＆LT;串＆GT; 与目录树中的所有文件，除了那些用户不访问：

In order to gain control on the level that you want, you should probably probe one directory at a time, instead of a whole tree. The following method populates the given IList<string> with all files found in the directory tree, except those where the user doesn't have access:

// using System.Linq
private static void AddFiles(string path, IList<string> files)
{
    try
    {
        Directory.GetFiles(path)
            .ToList()
            .ForEach(s => files.Add(s));

        Directory.GetDirectories(path)
            .ToList()
            .ForEach(s => AddFiles(s, files));
    }
    catch (UnauthorizedAccessException ex)
    {
        // ok, so we are not allowed to dig into that directory. Move on.
    }
}

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