ASP.NET Core Razor Page OnPost with parameter

C# Corner

Marius Vasile

5y3.7k.NET

I have a Razor page which OnGet receive a parameter from another page and load the data. The OnGet looks like below

public async Task OnGetPTWNoIdAsync(int ptwNoId)
{
some code here
}

OnPost looks like below

public async Task OnPostHazIdAsync()
{
if (!ModelState.IsValid)
{
return Page();
}
var newHazId = new HazId();
if (await TryUpdateModelAsync(newHazId, "HazId",
c => c.PTWNo,
c => c.HazClass,
c => c.HazDetails,
c => c.HazPMClass,
c => c.HazPMDetails
))
{
_context.HazIds.Add(newHazId);
await _context.SaveChangesAsync();
return RedirectToPage(new { ptwNoId = newHazId.PTWNo });
}
if (newHazId == null)
{
return NotFound();
}
return RedirectToPage( new { ptwNoId = newHazId.PTWNo });
}

However, after OnPost there is no data loaded. Can you help?

7 Replies

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Marius Vasile5y ago
I got it figuered out, there was no value for hidden input field
@Html.HiddenFor(model => model.OrgPTW, new { Value = "@OrgPTW.PTWNo" })
syntax was wrong. correct one
for="HazId.PTWNo" [email protected] />
and then redirection
return RedirectToPage("PTWNew", "PTWNoId", new { ptwNoId = newHazId.PTWNo });
...and it is working properly. Thank you Sachin for your efforts
Marius Vasile5y ago
I have the same error

An unhandled exception occurred while processing the request.
SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_HazIds_OrgPTWs_PTWNo". The conflict occurred in database "aspnet-RoSafety-53bc9b9d-9d6a-45d4-8429-2a2761773502", table "dbo.OrgPTWs", column 'PTWNo'.
The statement has been terminated.
Marius Vasile5y ago
1. OrgPTW = await _context.OrgPTWs.Where(a => a.PTWNo == ptwNoId).SingleOrDefaultAsync();
2. for="HazId.PTWNo" value="@Html.HiddenFor(model => model.OrgPTW.PTWNo)" />

The OnPost you already have

Marius Vasile5y ago

Ok Sachin, I have the following error

An unhandled exception occurred while processing the request.

SqlException: The INSERT statement conflicted with the FOREIGN KEY constraint "FK_HazIds_OrgPTWs_PTWNo". The conflict occurred in database "aspnet-RoSafety-53bc9b9d-9d6a-45d4-8429-2a2761773502", table "dbo.OrgPTWs", column 'PTWNo'.

The statement has been terminated.

This means I am not passing ptwNoId as PTWNo in the sql. I used the below line to get it

for="HazId.PTWNo" value="@Html.HiddenFor(model => model.OrgPTW, new { Value = "@OrgPTW.PTWNo" })" />

How do I pass ptwNoId to HasId.PTWNo please

Marius Vasile5y ago

Maybe I was not very clear when I ask the question, sorry for that. On page load, OnGet gets an id ptwNoId from another page, actualy, is a redirect from another page and sho it on the page. after getting that id, ptwNoId, this is used for any data uploaded, is the main id. But after OnPost, I want the page to load and show the uploaded value. instead, ptwNoId is no longer shown and no data. How do I get the page to be reloaded using the same ptwNoId?

Mageshwaran R5y ago

Hi Marius,

try this link,

https://www.learnrazorpages.com/razor-pages/model-binding

Marius Vasile5y ago

OnPost is not a problem, or maybe it is, but Redirect and OnGet after the OnPost is. I don't understand why I should pass the class name as parameter, be more specific please