Convert bytes to Base64 and back.
C#: Encode text to UTF-8 before converting it to a Base64 representation.
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;
string encoded = Convert.ToBase64String(Encoding.UTF8.GetBytes("hello"));
Console.WriteLine(encoded);
Console.WriteLine(Encoding.UTF8.GetString(Convert.FromBase64String(encoded)));Expected output EXAMPLE
aGVsbG8= hello
Details
Use Program.cs in a .NET 8 console project and run dotnet run. Uses only the .NET standard libraries. Encode text to UTF-8 before converting it to a Base64 representation.
Base64 does not encrypt or authenticate data.
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
04c557af5d9ff811182f707bf589439a10a173d803f1f2284bac484cc228f730- 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
aGVsbG8= hello
Exit code: 0. Standard error: empty. Validation: Exact stdout comparison. System-dependent values above are one recorded run.