The light that burns twice as bright burns half as long - and you have burned so very, very brightly, Silverlight.
With apologies to Blade Runner, I feel the quote is appropriate. Silverlight version 2 to 5 lived from 2007 to 2012 when Microsoft very quietly announced that development had ceased and end-of-life was scheduled for October 2021. That's a very short lifetime, even when measured in software platform years.
The .NET developer community was angered and bewildered by the announcement. I personally had a large important Silverlight 5 app in production use, and I knew other developers who, like me, had invested enormous amounts of time and effort in the Silverlight platform. The anger turned red hot when we discovered that there was no replacement of any form for Silverlight. Microsoft hinted that everyone should use HTML5 (HTML, JavaScript and CSS) to write replacement apps.
Silverlight ran the .NET CLR inside a web browser plug-in, so (subject to certain constraints) you could write complex business logic and render a rich UI using a subset of the controls, styles and transforms available in WPF desktop programs. With Silverlight it was possible to create rich responsive business apps and run them in the web browser. So to suggest that apps like that could be replaced with HTML5 was both insulting and preposterous.
HTML, JavaScript and CSS are just too primitive to create serious business apps. I have personally been driven to near insanity or breakdown trying to cobble together a stable, attractive, friendly or performant app in HTML5. There are lots of expensive toolkits of controls and components available from major vendors to supposedly help, but they usually stuff your code and UI with millions of lines of JavaScript and CSS styles nested to incomprehensible depths.
The recent arrival of Blazor makes writing HTML5 apps slightly less painful, but in the end you are still at the mercy of rendering your UI in the browser using dumb HTML, scripting and styles.
So here we are in the distant science fiction future of 2022 and there is still no way of writing rich and reliable business apps in the web browser.
In April 2022 I used Visual Studio 2015 (in a VM) to open my Silverlight hobby apps projects to take screenshots of them for posterity. Internet Explorer 11 issued security warning prompts, but luckily the apps did load and run. The screenshots can be seen here: Boxes, Hypno Balls, Prime Spiral and Random Shapes.
At this point I realise that Silverlight is completely DEAD and BURIED. It's rung down the curtain and joined the choir invisible. It's an ex-platform (with apologies to Monty Python).
I've flagged my Silverlight hobby project repositories as archived and I've moved the project files to an archive folder.
For more information on related topics see: I'm in the future of the web and it doesn't work.
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