Directory.GetFiles方法在第一次遇到无访问权限的文件夹时会失败。
该方法会抛出UnauthorizedAccessException异常（可以被捕获），但在此时，方法已经失败/终止。
我使用的代码如下：
try
{
// looks in stated directory and returns the path of all files found
getFiles = Directory.GetFiles(
@directoryToSearch,
filetype,
SearchOption.AllDirectories);
}
catch (UnauthorizedAccessException)
{
}
IList<string> 中，但排除了用户没有访问权限的文件。// 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.
}
}
我知道这个帖子很老，但如果有人偶然看到并需要答案，我在这里提供了一个递归解决方案：
public static List<string> GetAllAccessibleFiles(string rootPath, List<string> alreadyFound = null)
{
if (alreadyFound == null)
alreadyFound = new List<string>();
DirectoryInfo di = new DirectoryInfo(rootPath);
var dirs = di.EnumerateDirectories();
foreach (DirectoryInfo dir in dirs)
{
if (!((dir.Attributes & FileAttributes.Hidden) == FileAttributes.Hidden))
{
alreadyFound = GetAllAccessibleFiles(dir.FullName, alreadyFound);
}
}
var files = Directory.GetFiles(rootPath);
foreach (string s in files)
{
alreadyFound.Add(s);
}
return alreadyFound;
}
它返回一个List<string>，其中包含在给定根目录下可访问目录中所有文件的完整路径。
像这样调用它:
var files = GetAllAccessibleFiles(@"C:\myDirectory");
因此，一个结果可能是这样的：
C:\myDirectory\a\a.txt
C:\myDirectory\a\b.mp3
C:\myDirectory\b\a\a\foo.txt
C:\myDirectory\b\b\b\hello.exe
C:\myDirectory\b\c\bar.jpg
C:\myDirectory\and\so\on.bar
C:\myDirectory\a_file_in_root.bmp
static List<string> SearchFiles(string pattern)
{
var result = new List<string>();
foreach (string drive in Directory.GetLogicalDrives())
{
Console.WriteLine("searching " + drive);
var files = FindAccessableFiles(drive, pattern, true);
Console.WriteLine(files.Count().ToString() + " files found.");
result.AddRange(files);
}
return result;
}
private static IEnumerable<String> FindAccessableFiles(string path, string file_pattern, bool recurse)
{
Console.WriteLine(path);
var list = new List<string>();
var required_extension = "mp4";
if (File.Exists(path))
{
yield return path;
yield break;
}
if (!Directory.Exists(path))
{
yield break;
}
if (null == file_pattern)
file_pattern = "*." + required_extension;
var top_directory = new DirectoryInfo(path);
// Enumerate the files just in the top directory.
IEnumerator<FileInfo> files;
try
{
files = top_directory.EnumerateFiles(file_pattern).GetEnumerator();
}
catch (Exception ex)
{
files = null;
}
while (true)
{
FileInfo file = null;
try
{
if (files != null && files.MoveNext())
file = files.Current;
else
break;
}
catch (UnauthorizedAccessException)
{
continue;
}
catch (PathTooLongException)
{
continue;
}
yield return file.FullName;
}
if (!recurse)
yield break;
IEnumerator<DirectoryInfo> dirs;
try
{
dirs = top_directory.EnumerateDirectories("*").GetEnumerator();
}
catch (Exception ex)
{
dirs = null;
}
while (true)
{
DirectoryInfo dir = null;
try
{
if (dirs != null && dirs.MoveNext())
dir = dirs.Current;
else
break;
}
catch (UnauthorizedAccessException)
{
continue;
}
catch (PathTooLongException)
{
continue;
}
foreach (var subpath in FindAccessableFiles(dir.FullName, file_pattern, recurse))
yield return subpath;
}
}
private IEnumerable<String> FindAccessableFiles(string path, string file_pattern, bool recurse)
{
IEnumerable<String> emptyList = new string[0];
if (File.Exists(path))
return new string[] { path };
if (!Directory.Exists(path))
return emptyList;
var top_directory = new DirectoryInfo(path);
// Enumerate the files just in the top directory.
var files = top_directory.EnumerateFiles(file_pattern);
var filesLength = files.Count();
var filesList = Enumerable
.Range(0, filesLength)
.Select(i =>
{
string filename = null;
try
{
var file = files.ElementAt(i);
filename = file.FullName;
}
catch (UnauthorizedAccessException)
{
}
catch (InvalidOperationException)
{
// ran out of entries
}
return filename;
})
.Where(i => null != i);
if (!recurse)
return filesList;
var dirs = top_directory.EnumerateDirectories("*");
var dirsLength = dirs.Count();
var dirsList = Enumerable
.Range(0, dirsLength)
.SelectMany(i =>
{
string dirname = null;
try
{
var dir = dirs.ElementAt(i);
dirname = dir.FullName;
return FindAccessableFiles(dirname, file_pattern, required_extension, recurse);
}
catch (UnauthorizedAccessException)
{
}
catch (InvalidOperationException)
{
// ran out of entries
}
return emptyList;
})
return Enumerable.Concat(filesList, dirsList);
}
以上欢迎的改进。
EnumerateFiles 创建了一个 FileSystemEnumerableIterator 对象。在迭代枚举器时调用 MoveNext 方法时，如果出现任何 IOException，则迭代器将被处理。.ElementAt 克隆您的迭代器并遍历所有先前的元素，直到它达到所请求的索引。这意味着所有这些迭代器克隆体都将在完全相同的不可访问文件处失败。换句话说，Enumerable.Range.Select { .ElementAt } 技巧什么也没做。 - PayaIEnumerable<String> GetAllFiles(string path, string searchPattern)
{
return System.IO.Directory.EnumerateFiles(path, searchPattern).Union(
System.IO.Directory.EnumerateDirectories(path).SelectMany(d =>
{
try
{
return GetAllFiles(d, searchPattern);
}
catch (UnauthorizedAccessException e)
{
return Enumerable.Empty<String>();
}
}));
}
public string[] GetFilesFrom(string dir, string search_pattern, bool recursive)
{
List<string> files = new List<string>();
string[] temp_files = new string[0];
try { temp_files = Directory.GetFiles(dir, search_pattern, SearchOption.TopDirectoryOnly); }
catch { }
files.AddRange(temp_files);
if (recursive)
{
string[] temp_dirs = new string[0];
try { temp_dirs = Directory.GetDirectories(dir, search_pattern, SearchOption.TopDirectoryOnly); }
catch { }
for (int i = 0; i < temp_dirs.Length; i++)
files.AddRange(GetFilesFrom(temp_dirs[i], search_pattern, recursive));
}
return files.ToArray();
}
这是我对这个问题的解决方案。简单而且安全可靠。
=>是 lambda 运算符。你可以在这里阅读有关 C# 中 lambda 表达式的内容：http://msdn.microsoft.com/en-us/library/bb397687.aspx。 - Fredrik Mörk