ASP.NET Core MVC - Is there any way to change the value of specific data on model with session? - asp.net-core

Question

Is there any way to change the value of specific data on model?
Like for example my model contains
item_id
item_description
quantity
and you have many records on your data model with the use of session.
on input during changing the quantity i want to update the value on of model with session?
is it recommended? or is there any better way than my approach? thank you.

Answer 1

What I was trying to achieve is to modify the data inside the
session. Is modifying data on session also working like a database?
where you can get the id and modify the data that you want?
From your description, I assume you are using Session to the list of records, and now you want to update the session data, right? If that is the case, you could refer to the following sample:
Refer this article to enable the session middleware in the Startup.cs file.
[Note]: Please remember to set the session expired time via the IdleTimeout property. And, since you are using session to store a list of Objects, remember to add the SessionExtensions.
//required using Microsoft.AspNetCore.Http;
//required using System.Text.Json;
public static class SessionExtensions
{
public static void Set<T>(this ISession session, string key, T value)
{
session.SetString(key, JsonSerializer.Serialize(value));
}
public static T Get<T>(this ISession session, string key)
{
var value = session.GetString(key);
return value == null ? default : JsonSerializer.Deserialize<T>(value);
}
}
Add an Item View Model:
public class ItemViewModel
{
public int ItemId { get; set; }
public string ItemDescription { get; set; }
public int Quantity { get; set; }
}
Controller: I'm using a repository to set the Initial data. After getting data from session, we could modify the data, and then, call the set method to save the latest data to the session.
private readonly ApplicationDbContext _context;
private readonly IDataRepository _repository;
public TestController(ApplicationDbContext context, IDataRepository repository)
{
_context = context;
_repository = repository;
}
private readonly string SessionKeyName = "itemlist";
public IActionResult ItemIndex()
{
List<ItemViewModel> items = new List<ItemViewModel>();
//check if the session is exist or not.
if (HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName) == default)
{ //get the initial data.
items = _repository.GetItemViewModels();
//set value to the session.
HttpContext.Session.Set<List<ItemViewModel>>(SessionKeyName, items);
}
else
{
items = HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName);
}
return View(items);
}
public IActionResult EditItem(int Id)
{
List<ItemViewModel> items = new List<ItemViewModel>();
//check if the session is exist or not.
if (HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName) == default)
{
items = _repository.GetItemViewModels();
//set value to the session.
HttpContext.Session.Set<List<ItemViewModel>>(SessionKeyName, items);
}
else
{
items = HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName);
}
return View(items.Where(c=>c.ItemId == Id).FirstOrDefault());
}
[HttpPost]
public IActionResult EditItem(ItemViewModel item)
{
List<ItemViewModel> items = new List<ItemViewModel>();
//check if the session is exist or not.
if (HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName) == default)
{
items = _repository.GetItemViewModels();
//set value to the session.
HttpContext.Session.Set<List<ItemViewModel>>(SessionKeyName, items);
}
else
{
items = HttpContext.Session.Get<List<ItemViewModel>>(SessionKeyName);
}
//based on the primary key to find the special item,
var i = items.Where(c => c.ItemId == item.ItemId).FirstOrDefault();
//update the quantity.
i.Quantity = item.Quantity;
//Update the session with the latest data.
HttpContext.Session.Set<List<ItemViewModel>>(SessionKeyName, items);
//redirect to the ItemIndex action and reload the Index page.
return RedirectToAction(nameof(ItemIndex));
}
The result like this: