UnionArgParser VS Sieve

More formal argument parsing using the Argu library

Create a user interface (can start as Console.Readline() or Argu, or you can just go all in and write something with avalonia/fable)

Personally, I like how the Argu library is written: https://github.com/fsprojects/Argu

Biarity/Sieve: ⚗️ Clean & extensible Sorting, Filtering, and Pagination for ASP.NET Core (github.com)

I´m trying out Sieve and the rip my app to pieces and use that instead.

Similar to Sieve

https://github.com/Biarity/Sieve Sieve is a simple, clean, and extensible framework for .NET Core that adds sorting, filtering, and pagination functionality out of the box. Most common use case would be for serving ASP.NET Core GET queries.

If you're looking for a library for a REST API, there really aren't very many good ones. I used Sieve as a starting point to write my own because it didn't support the filtering syntax I was required to use. I would definitely not recommend a new person write their own, however.

I also looked at Sieve: https://github.com/Biarity/Sieve but I'm not sure it is 100% hitting what I am wanting. Unless I am just a bork at the end of my day unable to read properly. Any direction in the right area would greatly be appreciated!

For complex queries like this, you don't have a ton of choices. You could use Sieve (https://github.com/Biarity/Sieve) in lieu of your current implementation. I use it specifically in situations to handle filtering/paging/sorting, not as a general way to access data. Most of the time I write an underlying DB view and hook that up to a keyless entity and allow Sieve to do the actual filtering.

If you're using EF, you can use https://github.com/Biarity/Sieve