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Influential Danish Computing Figures

Denmark has produced a remarkable number of people whose work has shaped programming languages, software infrastructure, cryptography, and digital products worldwide.

Person	Known for	Contribution
Anders Hejlsberg	C#, TypeScript, Turbo Pascal, Delphi	Original author of Turbo Pascal, chief architect of Delphi, and a principal designer behind C# and TypeScript. Source
Bjarne Stroustrup	C++	Designer and original implementer of C++. Source
Rasmus Lerdorf	PHP	Created PHP. Born in Greenland; grew up in Denmark and Canada. Source

Full SQL Server on Apple Silicon with Podman

Apple Silicon is ARM64. Azure SQL Edge runs natively on it, but it does not support SQL CLR. Umbraco 17's database upgrade uses a SQL feature that requires CLR while migrating system dates to UTC, so Azure SQL Edge cannot complete that upgrade.

The supported workaround for local development is the full SQL Server 2022 Linux image, which is x86_64 only. Podman's Apple Hypervisor machine can use Rosetta to run that image on Apple Silicon.

Create the Rosetta-backed Podman machine

Install Rosetta:

Understanding `UmbracoApplicationUrl`

UmbracoApplicationUrl acts as the fallback base URL when Umbraco cannot determine a hostname from the content tree.

This typically happens when:

No hostname has been assigned to the root content node.
You're using hostless root paths such as:
- /
/en

Umbraco -- Matrix: what to set per environment (Examine + temp)

This guide is a quick lookup matrix for:

Umbraco:CMS:Examine:LuceneDirectoryFactory
Umbraco:CMS:Hosting:LocalTempStorageLocation

Official Documentation

XML Serialization Control in C#

When working with System.Xml.Serialization.XmlSerializer, you can control how POCO properties are serialized using naming conventions and attributes.

1. The `Specified` Suffix

Pattern: <PropertyName>Specified
Type: bool
Effect: Controls whether `` is serialized at all.

Emne: Anmodning om indsigt i personoplysninger i henhold til GDPR

Kære [Virksomhedens navn],

Jeg skriver for at anmode om indsigt i de personoplysninger, som jeres virksomhed måtte have om mig i overensstemmelse med artikel 15 i General Data Protection Regulation (GDPR).

I henhold til artikel 15 i GDPR har jeg som registreret person ret til at få bekræftet, om der behandles personoplysninger om mig, og i bekræftende fald adgang til følgende oplysninger:

De personoplysninger, som behandles om mig.
Formålene med behandlingen.

OSI Layers

The OSI (Open Systems Interconnection) model is a conceptual framework that standardizes the functions of a telecommunication or computing system into seven abstraction layers. Each layer in the OSI model serves a specific purpose and communicates with the adjacent layers. Here's a brief description of each layer from the bottom (Layer 1) to the top (Layer 7):

Physical Layer (L1):

Function: Deals with the physical connection between devices.
Activities: Transmission and reception of raw bit streams over a physical medium, such as cables or wireless signals.
Devices: Hubs, cables, repeaters.

	var builder = WebApplication.CreateBuilder(args);

	...

	builder.Services.Configure<ForwardedHeadersOptions>(options =>
	{
	options.ForwardedHeaders =
	ForwardedHeaders.XForwardedFor \|
	ForwardedHeaders.XForwardedHost \|
	ForwardedHeaders.XForwardedProto;

	public static class UriStringExtensions
	{
	public static Uri? ToUri(this string? uriString, UriKind uriKind = UriKind.RelativeOrAbsolute)
	{
	if (string.IsNullOrWhiteSpace(uriString)) return null;

	return Uri.TryCreate(uriString, uriKind, out var uri) ? uri : null;
	}

	public static IEnumerable<Uri> ToUriCollection(this string? uriCollectionString, char separator = ',', UriKind uriKind = UriKind.RelativeOrAbsolute)