C#

Goal

Write a C# block as a .NET file-based app. You don’t need a project file. Time: 10 minutes. Needs: .NET SDK 10 or later.

language: csharp

using System;
using System.IO;
using System.Text.Json;
using System.Text.Json.Nodes;

var path = Environment.GetEnvironmentVariable("TERMORQ_INPUT")
    ?? throw new InvalidOperationException("TERMORQ_INPUT is missing");
using var input = JsonDocument.Parse(File.ReadAllText(path));
var value = input.RootElement.GetProperty("trigger").GetProperty("text");
if (value.ValueKind != JsonValueKind.String)
    throw new InvalidOperationException("trigger.text must be a string");

Console.WriteLine(new JsonObject { ["message"] = value.GetString() }.ToJsonString());

Things to know

The runner runs dotnet run snippet.cs using file-based apps. Use top-level statements: you don’t need a class or Main.
Build output with JsonObject.ToJsonString(). Reflection-based JsonSerializer.Serialize(anonymousObject) may be disabled in file-based apps.
The first run of a snippet compiles it, so expect a few seconds of start-up.
An unhandled exception exits with a non-zero code, so the block fails.

Reading plain text

For Execute step with plain text:

using System.Text.Json.Nodes;
var text = File.ReadAllText(Environment.GetEnvironmentVariable("TERMORQ_INPUT")!);
Console.WriteLine(new JsonObject { ["message"] = text }.ToJsonString());

Check your run

Execute step prints {"message":"Hello from curl"}.

Exercise

Publish reversed: the text with its characters in reverse order.

Details

using System.Text.Json;
using System.Text.Json.Nodes;
using var doc = JsonDocument.Parse(File.ReadAllText(Environment.GetEnvironmentVariable("TERMORQ_INPUT")!));
var t = doc.RootElement.GetProperty("trigger").GetProperty("text").GetString() ?? "";
var arr = t.ToCharArray(); Array.Reverse(arr);
Console.WriteLine(new JsonObject { ["reversed"] = new string(arr) }.ToJsonString());