path-walk.md

How to Walk a Directory Tree

Note: Windows-indexed filesystem searching can be performed extremely fast by directly querying the Windows Search database. See winsearch.md for details.

Recursively Get all File Paths in a Folder

string[] filePaths = Directory.GetFiles(localFolderPath, "*", SearchOption.AllDirectories);

Walk a Filesystem

This example is more complex but does a better job preventing exceptions in edge cases: https://docs.microsoft.com/en-us/dotnet/csharp/programming-guide/file-system/how-to-iterate-through-a-directory-tree

/// <summary>
/// Recursively scan a directory tree and build an array containing paths to
/// all files found with filenames matching the given pattern.
/// </summary>
private static string[] FindFiles(DirectoryInfo root, string searchPattern = "*.cs")
{
    var mdFilePaths = new List<string>();

    string[] files = Directory.GetFiles(root.FullName, searchPattern);
    mdFilePaths.AddRange(files);

    foreach (DirectoryInfo dir in root.GetDirectories())
        mdFilePaths.AddRange(FindFiles(dir));

    return mdFilePaths.ToArray();
}