Webforms -> ViewModel - Pageload

🌎 Discussion in English
1

To get the convertions to DotVVM done you need to learn how the ViewModel concept works. I mean this is the same hurdle you need to overcome if you want to rewrite your project into Blazor, which I refused of doing because there is DotVVM which I like better.

Anyway I checked the documentation, the YouTube videos but I didn’t find anything on how to simply convert this to DotVVM:

protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
// do something
}
}

Handling Buttons convertions you are showing in the videos. But not the initial on load page.
Maybe this is something for the cheat sheet or the missing “Plan of modernization”

2

Assuming you want to place this method into the ViewModel class:

  • Make sure the class inherits from DotvvmViewModelBase
  • Override the Load method
public override async Task Load()
{
   ...
   if (this.Context.IsPostBack)
       ...
   await base.Load()
}

There are also Init and PreRender events which you can override. Usually, we load data in the PreRender event (naming :man_facepalming:), but please check the ViewModel docs for more details: Overview | DotVVM Documentation (especially the page lifecycle, bottom of the page)

3

It’s a great point that this could be added to the Cheat-sheet. I’ll do it when I have some time.