C# code

C# runs through .NET compiled to WebAssembly, with the Roslyn scripting engine. The runtime is embedded in Restorm: no .NET SDK is required on your machine.

The API

Symbol	Role
input	The value received on the input port
vars	A dictionary of the run variables
Console.Write / Console.WriteLine	Write to the execution log
The final expression	Its value leaves on the result port

The code is C# script (Roslyn style): no enclosing class and no Main to write, the statements are at the top level, and the final expression is the result.

Example

using System.Linq;
using System.Text.Json;

var doc = JsonDocument.Parse(input.ToString());
var commandes = doc.RootElement.GetProperty("commandes").EnumerateArray();

var payees = commandes
    .Where(c => c.GetProperty("statut").GetString() == "payee")
    .ToList();

var total = payees.Sum(c => c.GetProperty("montant").GetDouble());

Console.WriteLine($"{payees.Count} commandes payées, total {total} €");

new { nombre = payees.Count, total }

What is available

.NET’s base class library: System.Linq, System.Text.Json, System.Text.RegularExpressions, System.Security.Cryptography, System.Collections.Generic…

Limitations specific to C#

Caution

• No external packages. The packages field has no effect for C#: there is no NuGet restore. Only the base library is available.
• No network access. Unlike JavaScript / TypeScript, the C# sandbox exposes no fetch bridge. For a network call, use one of the scenario’s request actions, or a JavaScript code action.

This is the language to pick when you want to reuse business logic already written in C#, or when your team is more comfortable with it — not when you need to call something.