Thursday, February 15, 2018

Programmatic nuance in .Net and PowerShell which can wreck havoc

Photo by David Kovalenko at Unsplash

Took me an hour or so to figure out why something I had ported from C# to PowerShell was not working, and the culprit is how casting of decimals to bytes work.

In .Net: (byte)4.6 = 4, meaning it truncates

In PowerShell [byte]4.6 = 5, meaning it rounds up

The solution is to use [Math]::Floor instead in PowerShell, which of course works fine in .Net as well.