Razor pages - textarea asp-for binding problem

[isaksky]

For razor pages, when one modifies a bound model property in an OnPost method on a page with a asp-for="MyProperty" property, the new value is shown for input controls, but not for textarea controls. For textarea, when the page is rendered, it stays the same as the AttemptedValue.

To be clear:

<input asp-for="MyProperty"> shows the new value when it is updated in OnPost, but <textarea asp-for="MyProperty"></textarea> does not.

I would expect that the behavior (whether asp-for is bidirectional) should be consistent across input types, like input, textarea, select, etc.

Workaround:

public void OnPost() {
   // MyProperty = "Something"; // Updating this way does not work for `textarea`, but does for `input`

   // But this does:
   ModelState["MyProperty"].AttemptedValue = "My new value"`
}

Same as this issue, but this is for Razor Pages:

https://github.com/aspnet/Mvc/issues/6799

[pranavkm]

The linked issue is also for Razor Pages. That said, both Razor Views and Razor Pages have the same underlying infrastructure, the behavior and the possible fix would be the same. Closing this and since the other item is already tracking further work.