CODEWITHSUNDEEP
asp.net-corerazor
Raphael Schmitz
Raphael Schmitz

Reputation: 616

What is the most idiomatic way to redirect to a child creation page in ASP.NET?

Suppose a Parent model with a one-to-many relationship to several Child models. From a details page for a Parent, I want to link to a Child creation form. A Child entity created there is then supposed to belong to the Parent.

I understand how to "work the context" in order to connect the Child with the Parent. My question is about getting a Parent reference from the Parent view to the Child creation view.

I have found some solutions that seem very "low level" (e.g. setting the parent ID in TempData). I assume there is a more idiomatic (maybe even type-safe) way to do this.

I am using razor templates in Areas, if that makes a difference.

Upvotes: 0

Views: 56

Answers (1)

Anton Toshik
Anton Toshik

Reputation: 2909

Create a data-structure let's say CreateChildViewModel

public class CreateChildViewModel
{
     public int ParentId {get;set;}
     //... rest of the props
}

Now you can navigate to your CreateParentChild action and pass the id in the link using tag helpers <a asp-controller="YourController" asp-action="CreateParentChild" asp-route-parentId="YourParentId"></a>

[HttpGet]
public IActionResult CreateParentChild(int parentId) =>
    View(new CreateChildViewModel { ParentId = parentId });

and then in your view you can store this id in a hidden input field

@model YourNamespace.CreateChildViewModel
<input type="hidden" asp-for="ParentId" />

once you post this back to create the child you will have the Id in the form.

[HttpPost]
public IActionResult CreateParentChild(CreateChildViewModel vm) {
    //do your stuff
}

I'd say as a rule of thumb try to never use TempData

Upvotes: 1

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