Initialize form data with static SSR

[guardrex]

Fixes #33629

Javier ... Adding a bit to reflect your remarks at dotnet/aspnetcore#51978 (comment).

The code is a bit long for such a simple concept, so we could have a pseudo-code version here (as you have in your PU issue remark), and I can cross-link to the Blazor sample app where this fully working component example can live. This would merely show ...

protected override void OnInitialized() => Model ??= new();

protected override void OnParametersSet()
{
    if (Model!.Id == default)
    {
        LoadData();
    }
}

Mmmmmmmm 🤔 ... I do kind'a like that approach. Anyway, you can review this in this form, and I'll take care of moving it on a future commit.

Changed my mind on that ☝️! Our BWA sample adopts global interactive SSR, so it isn't ideal for just placing it. Let's just roll with this. It's long, but it's good to see the full component.

... and is there anything else that you'd like to add?

---

Internal previews

📄 File	🔗 Preview link
aspnetcore/blazor/forms/binding.md	ASP.NET Core Blazor forms binding