Error With HttpContext. File Path to txt file - asp.net

Question

I have a .txt file with a list of products. I need to add a project and use it but my file path doesn't work.
I've tried to add HttpContext.Current.Server.MapPath("~/ProductList.txt");
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using Newtonsoft.Json;
namespace AmazHumanLibrary
{
public class ProductRepository
{
string FilePath = HttpContext.Current.Server.MapPath("~/ProductList.txt");
public List<Product> GetAll()
{
List<Product> products = new List<Product>();
if (!File.Exists(FilePath))
{
var stream = File.Create(FilePath);
stream.Close();
return products;
}
string fileContent = File.ReadAllText(FilePath);
if (string.IsNullOrEmpty(fileContent))
{
return products;
}
products = JsonConvert.DeserializeObject<List<Product>>(fileContent);
return products;
}
But I get the error " The name HttpContext does not exist in the current context".
Here is my project structure:

Answer 1

To access HttpContext outside of a Controller or Razor Page, one way is to inject IHttpContextAccessor into your class (Repository), something like this:
public class ProductRepository
{
public ProductRepository(IHttpContextAccessor httpContext)
{
_httpContextAccessor = httpContext;
}
private readonly IHttpContextAccessor _httpContextAccessor;
public List<Product> GetAll()
{
string filePath = _httpContextAccessor.HttpContext.Server.MapPath("~/ProductList.txt");
...
Official docs here.