13

我正在尝试以这种方式从文件夹中获取所有文件：

try
{
    string[] files = Directory.GetFiles(folderBrowserDialog1.SelectedPath, "*.*", SearchOption.AllDirectories);
}
catch (UnauthorizedAccessException)
{
    throw;
}

如果我的根文件夹包含用户无权访问的文件夹，UnauthorizedAccessException则会被捕获并且我的数组为空并且所有递归都失败了。

我该如何处理这种情况并确保我的代码在未经许可的情况下忽略位置，但从具有权限的位置添加文件？

4

2 回答 2

17

请参阅其他帖子上的SafeFileEnumerator。我过去成功地使用了 SafeFileEnumerator 代码。当您根本无法访问单个文件时，它可以防止丢失整个枚举，因此您仍然可以遍历您可以访问的文件。

编辑：我拥有的版本与我链接的版本略有不同，所以让我分享一下我拥有的版本。

public static class SafeFileEnumerator
{
    public static IEnumerable<string> EnumerateDirectories(string parentDirectory, string searchPattern, SearchOption searchOpt)
    {
        try
        {
            var directories = Enumerable.Empty<string>();
            if (searchOpt == SearchOption.AllDirectories)
            {
                directories = Directory.EnumerateDirectories(parentDirectory)
                    .SelectMany(x => EnumerateDirectories(x, searchPattern, searchOpt));
            }
            return directories.Concat(Directory.EnumerateDirectories(parentDirectory, searchPattern));
        }
        catch (UnauthorizedAccessException ex)
        {
            return Enumerable.Empty<string>();
        }
    }

    public static IEnumerable<string> EnumerateFiles(string path, string searchPattern, SearchOption searchOpt)
    {
        try
        {
            var dirFiles = Enumerable.Empty<string>();
            if (searchOpt == SearchOption.AllDirectories)
            {
                dirFiles = Directory.EnumerateDirectories(path)
                                    .SelectMany(x => EnumerateFiles(x, searchPattern, searchOpt));
            }
            return dirFiles.Concat(Directory.EnumerateFiles(path, searchPattern));
        }
        catch (UnauthorizedAccessException ex)
        {
            return Enumerable.Empty<string>();
        }
    }
}

示例用法：

foreach(string fileName in SafeFileEnumerator.EnumerateFiles(folderPath, "*" + extension, SearchOption.AllDirectories))
{
    //Do something with filename, store into an array or whatever you want to do.
}
于 2012-12-19T14:42:45.697 回答
3

您可以使用 FileSystemInfo 对象和递归来完成此操作：

static List<string> files = new List<string>();

static void MyMethod() {
    DirectoryInfo dir = new DirectoryInfo(folderBrowserDialog1.SelectedPath);
    ProcessFolder(dir.GetFileSystemInfos());
}

static void ProcessFolder(IEnumerable<FileSystemInfo> fsi) {
    foreach (FileSystemInfo info in fsi) {

        // We skip reparse points 
        if ((info.Attributes & FileAttributes.ReparsePoint) == FileAttributes.ReparsePoint) {
            Debug.WriteLine("Skipping reparse point '{0}'", info.FullName);
            return;
        }

        if ((info.Attributes & FileAttributes.Directory) == FileAttributes.Directory) {
            // If our FileSystemInfo object is a directory, we call this method again on the
            // new directory.
            try {
                DirectoryInfo dirInfo = (DirectoryInfo)info;
                ProcessFolder(dirInfo.GetFileSystemInfos());
            }
            catch (Exception ex) {
                // Skipping any errors
                // Really, we should catch each type of Exception - 
                // this will catch -any- exception that occurs, 
                // which may not be the behavior we want.
                Debug.WriteLine("{0}", ex.Message);
                break;
            }
        } else {
            // If our FileSystemInfo object isn't a directory, we cast it as a FileInfo object, 
            // make sure it's not null, and add it to the list.
            var file = info as FileInfo;
            if (file != null) {
                files.Add(file.FullName);
            }
        }
    }
}

MyMethod获取您选择的路径并使用它创建一个DirectoryInfo对象，然后调用该GetFileSystemInfos()方法并将其传递给该ProcessFolder方法。

该ProcessFolder方法查看每个FileSystemInfo对象，跳过重解析点，如果FileSystemInfo对象是目录，则ProcessFolder再次调用该方法 - 否则，它将FileSystemInfo对象转换为FileInfo对象，确保它不为空，然后将文件名添加到列表中。

更多阅读：

于 2012-12-19T15:50:37.627 回答