Create nested directories.

Create a directory tree using the .NET Directory API.

using System;
using System.IO;
using System.Linq;
using System.Collections.Generic;
using System.Text.Json;

Directory.CreateDirectory("output/reports");
Console.WriteLine(Directory.Exists("output/reports"));

Expected output EXAMPLE

True

Details

Use Program.cs in a .NET 8 console project (dotnet new console --framework net8.0), then dotnet run. Uses only the .NET standard libraries.

✓ Verified

Tested on Ubuntu 24.04.5 LTS · 2026-11-02 18:00:31 UTC · 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: 23bd0950ad87229aa29a203cd2eb734d1e66e7b4d2d74aeeab4535dde08712e2
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.

# No input files required.

Observed standard output

True

Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.

# C# # mkdir