Knowledge Base

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====== Supporting Material for ".NET and Linux" tech talk ======

===== Code Snippets =====

==== Unguarded Code ====

<code csharp>
var registryValue =
	Registry.GetValue("HKEY_CURRENT_USER", "value", "blarg");

Console.WriteLine(registryValue);
</code>

This code will raise a type initializer exception if run on a non-Windows system.

It will also generate a compile-time warning: **“warning CA1416: This call site is reachable on all platforms. ‘Registry.GetValue(string, string?, object?)’ is only supported on: ‘windows'”**

==== Guarded Code ====

<code csharp>
var registryValue = (OperatingSystem.IsWindows())
	? Registry.GetValue("HKEY_CURRENT_USER", "value", "blarg")
	: $"Registry does not exist in {Environment.OSVersion}";

Console.WriteLine(registryValue);
</code>

This code will run successfully on all platforms. It will not generate a compile-time warning, as the compiler will see that the code is guarded.

==== Simple IoT Example ====

This is a simple code example for blinking an LED on a breakout board attached to a Raspberry Pi.

<code csharp>
using System;
using System.Device.Gpio;
using System.Threading;

Console.WriteLine("Blinking LED. Press Ctrl+C to end.");
int pin = 18;
using var controller = new GpioController();
controller.OpenPin(pin, PinMode.Output);
bool ledOn = true;
while (true)
{
    controller.Write(pin, ((ledOn) ? PinValue.High : PinValue.Low));
    Thread.Sleep(1000);
    ledOn = !ledOn;
}
</code>

Full example is [[https://docs.microsoft.com/en-us/dotnet/iot/tutorials/blink-led|here]].

===== Links =====

[[https://dotnet.microsoft.com/en-us/download|Download .NET]] – Downloads for .NET, including ASP.NET Core.

[[https://docs.microsoft.com/en-us/dotnet/core/install/linux|Install .NET on Linux Distributions]]

[[https://docs.microsoft.com/en-us/dotnet/core/rid-catalog|.NET Runtime Identifier (RID) catalog]]

[[https://docs.microsoft.com/en-us/dotnet/iot/intro|.NET IoT]] – Develop apps for IoT devices with the .NET IoT Libraries.

[[https://docs.microsoft.com/en-us/dotnet/standard/native-interop/cross-platform|Writing cross platform P/Invoke code]]

==== Language Comparison – Go ====

[[https://go.dev/|go.dev]] – Go home page

[[https://go.dev/doc/tutorial/getting-started|Tutorial: Get Started with Go]]

[[https://gobyexample.com/|Go by Example]] – Annotated example programs.

[[https://gist.github.com/asukakenji/f15ba7e588ac42795f421b48b8aede63|Go GOOS and GOARCH]] – Platform targeting values.

==== Language Comparison – Rust ====

[[https://www.rust-lang.org/|Rust Programming Language]] – Rust home page

[[https://doc.rust-lang.org/stable/rust-by-example/|Rust by Example]] – Collection of runnable example programs illustrating various Rust concepts.

[[https://rust-lang-nursery.github.io/rust-cookbook/|Rust Cookbook]] – Collection of simple examples that demonstrate good practices to accomplish common programming tasks.

[[https://doc.rust-lang.org/nightly/rustc/platform-support.html|Platform Support]]