How to POST from one Page Handler to another?

Question

I am working on a ASP.NET Core 2.0 project using Razor Pages (not MVC).

I have the following flow:

1. User fills out form and POSTs
2. This page's POST handler validates the info and returns Page() if there are issues. If not, handler saves data to database.
3. From here, I want the handler to POST to a different page's POST handler with the validated and saved data from Step 2.

How do I POST to another page from within a page handler? Is this the appropriate way to do this kind of thing? The reason I don't want to RedirectToPage() is because I don't want the final page in the sequence to be navigable via GET. The final page should not be accessible via a direct link but should only return on a POST.

I thought about validating/saving the data and setting a boolean "IsValid" and returning the page, checking for that IsValid, and immediately POSTing to the final page via JS. However this feels dirty.

Answer 1

Set the "asp-page" property of the form to your other page. Then set values in the standard way.

<form method="post" asp-page="/pathto/otherpage">
Select Example:<select name="DataForOtherPage">

Then in your controller, bind the value...

 [BindProperty]
 public string DataForOtherPage { get; set; }