How Can I Handle UnauthorizedAccessException When Using Directory.GetFiles to Traverse Directories?

Elegantly handle the UnauthorizedAccessException exception that occurs when Directory.GetFiles traverses the directory

When performing file and directory operations, you may encounter Directory.GetFiles exceptions when using the UnauthorizedAccessException method. This exception occurs when a method attempts to access a directory for which the user lacks appropriate permissions.

To solve this problem, it is recommended to probe directories one by one instead of traversing the entire directory tree. This approach allows finer control over operations. The following code demonstrates an improved approach:

private static void AddFiles(string path, IList<string> files)
{
    try
    {
        foreach (string file in Directory.GetFiles(path))
        {
            files.Add(file);
        }

        foreach (string subdirectory in Directory.GetDirectories(path))
        {
            AddFiles(subdirectory, files);
        }
    }
    catch (UnauthorizedAccessException ex)
    {
        // 忽略此目录的访问权限错误，继续处理其他目录
    }
}

In this method, UnauthorizedAccessException is captured and handled gracefully, allowing the program to continue execution and possibly discover other accessible files. The iteration continues through the directory hierarchy, calling itself recursively to explore subdirectories.

By using this technique, you can avoid Directory.GetFiles method termination due to access denied errors and maintain control of the directory traversal process. This method uses a foreach loop instead of ToList().ForEach(), making it more readable and efficient.

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