Enumerate matching files recursively.
C#: Sort relative filenames when reproducible traversal output is required.
using System;
using System.IO;
using System.Linq;
using System.Text;
using System.Text.Json;
using System.Text.RegularExpressions;
using System.Collections.Generic;
using System.Globalization;
using System.Security.Cryptography;
using System.Threading;
using System.Threading.Tasks;
foreach (string path in Directory.EnumerateFiles("src", "*.txt", SearchOption.AllDirectories).Order(StringComparer.Ordinal))
Console.WriteLine(Path.GetRelativePath("src", path).Replace(Path.DirectorySeparatorChar, '/'));Expected output EXAMPLE
a.txt sub/b.txt
Details
Use Program.cs in a .NET 8 console project and run dotnet run. Uses only the .NET standard libraries. Sort relative filenames when reproducible traversal output is required.
Tested on Ubuntu 24.04.5 LTS · · 8.0.425 · libc6 2.39-0ubuntu8.9
Test inputs, results and environment
The exact published code ran in a dedicated Linux test container with prepared inputs. Unprivileged snippet process, external networking disabled, read-only root filesystem, and a fresh temporary working directory. Fixtures and output records are isolated from the application database. Testing covers this example and its stated checks, not every input, operating system, or runtime version. The Linux container shares its host's kernel; this is not a native Windows test.
- Architecture / host kernel
- x86_64 / 6.18.54.1-microsoft-standard-WSL2
- Snippet identity / locale
- uid=65534, gid=65534 (unprivileged) / C.UTF-8
- Interpreter invocation
dotnet build --no-restore && dotnet out/csharp.dll- Container image ID
sha256:32dc2d998158b6554c99b73b533f423696a0f3e31e8cbea9db10b5eee9a2fadd- Code SHA-256
43874ad1960f0e941f21a42441545b92ed96e8c43209cfa9ddf54ed5dfad8f60- Dependencies
- libc6 2.39-0ubuntu8.9
Test input setup
These are the prepared inputs used by the test harness. See Details above for the prerequisites and how to run this example.
mkdir -p src/sub; touch src/a.txt src/sub/b.txt src/code.cs
Observed standard output
a.txt sub/b.txt
Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.