February 2025 - ozdotnet - codify.mailman3.com

Multi-indexed in-memory collection
by Greg Keogh Aug. 7, 2025

Aug. 7, 2025

Hello folks, we've found a performance bottleneck searching for items in a large in-memory collection. Most of the code was converted from 15+ year old C++ code into C# so a lot of weird looking stuff came across. There are lots of sequential searches for items in arrays and List<> which have complexity O(n) and get really slow for large collections. I previously converted one bottleneck List<> into a Dictionary<> and it was a miracle cure, but it was a simple case with one property value being a unique key. The next bottleneck collection needs to be searched efficiently on different property values, and I'm wondering if anyone knows of a collection which supports multiple indexes (possibly non-unique). An in-memory SQLite table with multiple indexes would do the job, but it's a bit heavyweight and like hammering a screw. Using multiple Dictionaries or Sets to index the same objects won't work due to non-unique values. Maybe there is some lightweight package around for this sort of thing? It's a classic computer science problem. *Greg Keogh*

6 7

Customisable web app styling
by Greg Keogh Aug. 5, 2025

Aug. 5, 2025

Folks, I'm trying to find the "best" way of allowing different customers to style their own hosted version of our web app (actually a Blazor net8.0 app). For years we hosted a single global copy of the app in our Azure subscription where multiple customers would use it. It has a single line for the app's styles: <link rel="stylesheet" href="app.css" /> When customers deploy the app in their own subscriptions it would be great to leave the default app.css file untouched but allow them to easily override any style elements they like. What's the best way of doing that? Do I simply append a line like: <link rel="stylesheet" href="{some customer uri}/custom.css" /> Do styles in that link override any identical ones in the previous one? I'm not sure of the cascade order or conventions. There might be better techniques I'm not aware of. Thanks, *Greg K*

2 1

Are the archives of ozDotNet meant to be Google crawlable?
by mike smith March 5, 2025

March 5, 2025

Mike

2 1