Link in partial Razor Page fires wrong OnGet - asp.net-core

Question

I am using a razor page to display an ItemT model and at the bottom I inserted a partial view to show all properties (which are not assigned to this model in a n:m relation).
The PageModel 'FreePropertiesToItemT' has two public properties:
public ItemT ItemT { get; set; } // the one Item to show
public IList<PropertyIndexViewModel> FreeProperties { get; set; } // all free properties
An OnGetAsync(int? id) Method is called which works fine. The Page shows all data correctly.
The view displays a link for every Property:
<a asp-page-handler="addProperty" asp-route-id="#item.PropertyID">add</a>
This creates the link:
add
This is the correct link (I think). The route, id value and the handler are correct because there is a second OnGet Method in the PageModel:
public async Task<IActionResult> OnGetaddPropertyAsync(int? id)
However, the link only calls OnGetAsync (and not OnGetaddProppertyAsync) every time and, of course, for every Property!
What am I missing?
Model of ItemT:
public class ItemT
{
[Key]
public int ItemTID { get; set; }
[Required]
[StringLength(100, MinimumLength = 1)]
[Display(Name = "ItemT")]
public string Title { get; set; }
public bool isActive { get; set; } = true;
public virtual ICollection<ItemTProperty> ItemTProperties { get; set; }
}
ViewModel of free properties:
public class PropertyIndexViewModel
{
[Key]
public int PropertyID { get; set; }
[Required]
[StringLength(100, MinimumLength = 1)]
public string Title { get; set; }
public bool DefaultsOnly { get; set; }
[Display(Name = "Unit")]
public string Unit { get; set; }
[Display(Name = "Valuetype")]
public string Valuetype { get; set; }
}
The Page to list one ItemT:
#page
#model Inventory.Areas.Inventory.Pages.ItemTs.FreePropertiesToItemTModel
#{
ViewData["Title"] = "FreePropertiesToItemT";
}
<h1>Free Properties</h1>
<div>
<h4>ItemT</h4>
<hr />
<dl class="row">
<dt class="col-sm-2">
#Html.DisplayNameFor(model => model.ItemT.Title)
</dt>
<dd class="col-sm-10">
#Html.DisplayFor(model => model.ItemT.Title)
</dd>
<dt class="col-sm-2">
#Html.DisplayNameFor(model => model.ItemT.isActive)
</dt>
<dd class="col-sm-10">
#Html.DisplayFor(model => model.ItemT.isActive)
</dd>
</dl>
</div>
<div>
<a asp-page="./Edit" asp-route-id="#Model.ItemT.ItemTID">Edit</a> |
<a asp-page="./Index">Back to List</a>
</div>
<p></p>
<div>
#{
ViewData["FreeProperties"] = true;
}
<partial name="../Properties/_Properties.cshtml" model="Model.FreeProperties" />
</div>
The Partial which is loaded:
#using Inventory.DAL.ViewModels
#model IList<PropertyIndexViewModel>
<table class="table">
<thead>
<tr>
<th>
#Html.DisplayNameFor(model => model[0].Title)
</th>
<th>
#Html.DisplayNameFor(model => model[0].DefaultsOnly)
</th>
<th>
#Html.DisplayNameFor(model => model[0].Unit)
</th>
<th>
#Html.DisplayNameFor(model => model[0].Valuetype)
</th>
<th></th>
</tr>
</thead>
<tbody>
#foreach (var item in Model)
{
<tr>
<td>
#Html.DisplayFor(modelItem => item.Title)
</td>
<td>
#Html.DisplayFor(modelItem => item.DefaultsOnly)
</td>
<td>
#Html.DisplayFor(modelItem => item.Unit)
</td>
<td>
#Html.DisplayFor(modelItem => item.Valuetype)
</td>
<td>
#if (ViewBag.FreeProperties != null)
{
<a asp-page-handler="addProperty" asp-route-id="#item.PropertyID">add</a>
}
</td>
</tr>
}
</tbody>
</table>
And the c# code behind the page:
namespace Inventory.Areas.Inventory.Pages.ItemTs
{
public class FreePropertiesToItemTModel : PageModel
{
private readonly IUnitOfWork _uow;
public FreePropertiesToItemTModel(IUnitOfWork uow)
{
_uow = uow;
}
public ItemT ItemT { get; set; }
public IList<PropertyIndexViewModel> FreeProperties { get; set; }
public async Task<IActionResult> OnGetAsync(int? id)
{
if (id == null)
{
return NotFound();
}
ItemT = await _uow.ItemTRepo.getById((int)id);
if (ItemT == null)
{
return NotFound();
}
FreeProperties = await _uow.PropertyRepo.getFreePropertiesForItemT((int)id);
return Page();
}
public async Task<IActionResult> OnGetaddPropertyAsync(int? id)
{
if( id == null)
{
return NotFound();
}
if(ItemT == null) { return NotFound(); }
await _uow.ItemTRepo.addProperty(ItemT.ItemTID, (int)id);
await _uow.Commit();
return Page();
}
}
}

Answer 1

The issue is that your handler name error ,change it like below:
public async Task<IActionResult> OnGetAddPropertyAsync(int? id)
The first letter of handler name must be capitalized , otherwise handler=addProperty in the url is treated as a query-string parameter not a handler name.