Problem with the convert string to int in Method

[Daniel_04]

using System;
using System.Collections.Generic;
using System.Text;

namespace ConsoloAPP2._199
{
    class Product
    {

        public int ProductId { get; set; }
        public string ProductName { get; set; }
        public int AvailableQuantity { get; set; }
        public decimal AcquisitionPrice { get; set; }
        public decimal BaseSellsPrice { get; set; }

        Menu menu = new Menu();

        private static List<Product> products = new List<Product>();   

        public void AddProduct()
        {
           Product product1 = new Product();
           Console.Write("\n\n {0,12} {1, 8}", "1", "Напишете ID на продукта ");
           product1.ProductId = int.Parse(Console.ReadLine());
         
           Console.Write(" {0,12} {1, 8}", "2", "Напишете име на продукта ");
           product1.ProductName = Console.ReadLine();

            Console.Write(" {0,12} {1, 8}", "3", "Напишете покупна цена на продукта ");
            product1.AcquisitionPrice = decimal.Parse(Console.ReadLine());

            Console.Write(" {0,12} {1, 8}", "4", "Напишете продажна цена на продукта ");
            product1.BaseSellsPrice = decimal.Parse(Console.ReadLine());

            products.Add(product1);

            Console.Write("\n\n {0,12} {1, 8}", "", "Искате ли да добавите още продукти? ");
            string chooseYN = Console.ReadLine();
            if (chooseYN == "y" ) { AddProduct(); }
            else { menu.ShowMainMenu(); }
        }

        public void ShowProducts()
        {
            int i = 1;
            foreach (Product element in Product.products)
            {
                Console.Write("\n\n {0,12} {1, 3}", i++, "");
                Console.WriteLine($"{element.ProductId, element.ProductName} ");  <<<------------- here is the mistake
            }

            Console.Write("\n\n {0,12} {1, 8}", "", "Натисни някой бутон за да продължиш" );
            string stop = Console.ReadLine();
            menu.ShowMainMenu();
        }
    }
}

How to fix this mistake? How to convert this type string in int ?

 

[Skydiver]

You need put each thing to be printed in its own curly braces. The way you wrote it, the C# compiler was thinking that element.ProductName was your width specifier for element.ProductId. Since widths are supposed to be integers, obviously a string cannot be converted to an integer implicitly.

Console.WriteLine($"{element.ProductId}, {element.ProductName} ");

If you want to do formatting for each of elementProductId and element.ProductName, read up on C# string formatting:

$ - string interpolation - format string output - C# reference

String interpolation using the `$` token provides a more readable and convenient syntax to format string output than traditional string composite formatting.

docs.microsoft.com

 

[carlhyde]

The int.TryParse() method is used to convert string to int in C#, but it does not throw an exception if the string is not a valid integer representation. Instead, it returns a Boolean value indicating whether the conversion was successful. Here's an example:

string input = "123";
if (int.TryParse(input, out int number)) {
    // Conversion was successful
} else {
    // Conversion was not successful
}

 

[Skydiver]

@carlhyde : Welcome to the forums. In the future, please post code in code tags to help preserve indents.

If you re-read post #1, closely, you'll see that the issue the OP was having was on line 49. It was not about how to convert string input into an integer. It was about the compiler expecting to see an integer after a comma, but instead it do it found a string.