Skip to main content

C# 11–The scoped keyword

While browsing through the source code of the .NET framework(what else would you do with some free time?) I noticed the usage of the scoped keyword:

This triggered my interest as I didn't know that this keyword existed. Time to find out what it does...

To explain what this keyword does, I have to talk first about ref struct. C# 8 introduced ref struct where it was used to implement the Span type. A ref struct guarantees that an instance of the type is allocated on the stack and can’t escape to the managed heap. To guarantee this, strict scoping rules are enforced by the compiler.

More about ref structure types here: ref struct types - C# reference | Microsoft Learn

When you pass references to methods on a ref struct, the compiler ensures that the variables you refer to don't go out of scope before the struct itself. Otherwise, the ref struct might refer to out-of-scope variables:

The code above results in a compiler error:

The fix is to introduce the scoped keyword. Now the compiler will allow to pass these variables and it will treat the argument with the same scope as a local variable in the method.

Hope that helps…

Popular posts from this blog

DevToys–A swiss army knife for developers

As a developer there are a lot of small tasks you need to do as part of your coding, debugging and testing activities.  DevToys is an offline windows app that tries to help you with these tasks. Instead of using different websites you get a fully offline experience offering help for a large list of tasks. Many tools are available. Here is the current list: Converters JSON <> YAML Timestamp Number Base Cron Parser Encoders / Decoders HTML URL Base64 Text & Image GZip JWT Decoder Formatters JSON SQL XML Generators Hash (MD5, SHA1, SHA256, SHA512) UUID 1 and 4 Lorem Ipsum Checksum Text Escape / Unescape Inspector & Case Converter Regex Tester Text Comparer XML Validator Markdown Preview Graphic Color B

Help! I accidently enabled HSTS–on localhost

I ran into an issue after accidently enabling HSTS for a website on localhost. This was not an issue for the original website that was running in IIS and had a certificate configured. But when I tried to run an Angular app a little bit later on http://localhost:4200 the browser redirected me immediately to https://localhost . Whoops! That was not what I wanted in this case. To fix it, you need to go the network settings of your browser, there are available at: chrome://net-internals/#hsts edge://net-internals/#hsts brave://net-internals/#hsts Enter ‘localhost’ in the domain textbox under the Delete domain security policies section and hit Delete . That should do the trick…

Azure DevOps/ GitHub emoji

I’m really bad at remembering emoji’s. So here is cheat sheet with all emoji’s that can be used in tools that support the github emoji markdown markup: All credits go to rcaviers who created this list.