How to code with Umbraco and Razor pages ?

Hi all,

I'm having a hard time understanding the best way to code something clean with Umbraco. By that, I mean that a lot of code is in my templates which is not the cleanest work ever...

For example, my file "department.cshtml" starts with :

@using System.Runtime.InteropServices.JavaScript

@using Umbraco.Cms.Web.Common.PublishedModels; @inherits Umbraco.Cms.Web.Common.Views.UmbracoViewPage @{ Layout = "master.cshtml"; ViewBag.Title = Model.Value("title");

IPublishedContent? mediaItem = Model.Value<IPublishedContent>("planImage");
string imageUrl = null;
if (mediaItem != null)
{
    imageUrl = mediaItem.Url();
}

string? modelGuid = Model.Key.ToString();

IPublishedContent? team = Umbraco
    .Content(Guid.Parse(modelGuid))?
    .ChildrenOfType("people")?
    .FirstOrDefault(x => x.IsVisible());
string? teamGuid = team?.Key.ToString();
IEnumerable<IPublishedContent>? teamMembers = null;
IEnumerable<IPublishedContent>? managers = null;

if (teamGuid != null) {
    teamMembers = Umbraco.Content(Guid.Parse(teamGuid))?
        .ChildrenOfType("person")?
        .Where(x => x.IsVisible())
        .Where(x => x.Value("manager")?.ToString() == "False")
        .OrderBy(x => x.Value("lastName"));

    managers = Umbraco.Content(Guid.Parse(teamGuid))?
        .ChildrenOfType("person")?
        .Where(x => x.IsVisible())
        .Where(x => x.Value("manager")?.ToString() == "True")
        .OrderBy(x => x.Value("lastName"));
}

All this code would normally go to the file code-behind "department.cs" attached to my Razor page. But, if I try to use this way, I can't use some code for Umbraco like :

Umbraco
    .Content(Guid.Parse(modelGuid))?
    .ChildrenOfType("people")?
    .FirstOrDefault(x => x.IsVisible());

How can I do this ?

Thank you all in advance for your time and patience.

Disclaimer : I'm a baby dev currently doing her first project ever, sorry if all of this sounds stupid, I'm learning. ☺