C#•6mo ago

✅ NullReferenceException for a array of bytes (image)

hey everybody i'm new to ASP.NET i was doing a small ecommerce project and i want to add a default picture for the product if not exists but i keep getting null error on the if statement that checks if its null. here is a picture of the error keeps appearing in visual studio

9 Replies

canton7•6mo ago

Model is null

Al3mid3xOP•6mo ago

well i'm trying to create a new product (which is the model used for this page)

@model Giftos.Entities.Product

@model Giftos.Entities.Product

and here is my Product class

c#
using System.ComponentModel.DataAnnotations;

namespace Giftos.Entities
{
    public class Product
    {
        [Key]
        public Guid Id { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public string Name { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public string Description { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public int Stock { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public int Price { get; set; }
        public byte[] Image { get; set; }




        public Product(string name, string description, int price, int stock)
        {
            Name = name;
            Description = description;
            Price = price;
            Stock = stock;
        }

        public Product() { }
    }
}

c#
using System.ComponentModel.DataAnnotations;

namespace Giftos.Entities
{
    public class Product
    {
        [Key]
        public Guid Id { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public string Name { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public string Description { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public int Stock { get; set; }

        [Required(ErrorMessage = "This field is required.")]
        public int Price { get; set; }
        public byte[] Image { get; set; }




        public Product(string name, string description, int price, int stock)
        {
            Name = name;
            Description = description;
            Price = price;
            Stock = stock;
        }

        public Product() { }
    }
}

Al3mid3xOP•6mo ago

ProductsController class

message.txt

Kouhai•6mo ago

You need to provide a model instance to the view

Al3mid3xOP•6mo ago

can you tell me how to do it please as i said i'm new to asp.net

Kouhai•6mo ago

// GET: Products/Create
public IActionResult Create()
{
    return View(new Product());
}

// GET: Products/Create
public IActionResult Create()
{
    return View(new Product());
}

Should do the trick

Al3mid3xOP•6mo ago

Ye it did thank you i have another thing i need help with should i open another post for it ?@canton7@Kouhai

canton7•6mo ago

Yes $close

MODiX•6mo ago

If you have no further questions, please use /close to mark the forum thread as answered

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✅ NullReferenceException for a array of bytes (image)