Question

{
    class Program
    {
        static void Main(string[] args)
        {
            int id = 0, stock = 0, published = 0, newstock;
            double price = 0.00;
            string type = " ", title = " ", author = " ";

            Program inventroy = new Program();
            inventroy.read_one_record(ref id, ref stock, ref published, ref price, ref type, ref title, ref author);

            Console.WriteLine("Update Number In Stock");
            Console.WriteLine("=======================");
            Console.Write("Item ID: ");
            Console.WriteLine(id);
            Console.Write("Item Type: ");
            Console.WriteLine(type);
            Console.Write("Price: ");
            Console.WriteLine(price);
            Console.Write("Number In Stock: ");
            Console.WriteLine(stock);
            Console.Write("Title: ");
            Console.WriteLine(title);
            Console.Write("Author/Artist: ");
            Console.WriteLine(author);
            Console.Write("Published: ");
            Console.WriteLine(published);
            Console.WriteLine("=======================");

            Console.Write("Please Enter New Stock Number: ");
            string line = Console.ReadLine();
            newstock = int.Parse(line);

            Program writeinv = new Program();

            writeinv.write_one_record(ref id, ref newstock, ref published, ref price, ref type, ref title, ref author);
        }

        void read_one_record(ref int id, ref int stock, ref int published, ref double price, ref string type, ref string title, ref string author)
        {
            StreamReader myFile = File.OpenText("Inventory.dat");

            id = int.Parse(myFile.ReadLine());
            stock = int.Parse(myFile.ReadLine());
            published = int.Parse(myFile.ReadLine());
            price = double.Parse(myFile.ReadLine());
            type = myFile.ReadLine();
            title = myFile.ReadLine();
            author = myFile.ReadLine();

            myFile.Close();

        }
        void write_one_record(int id, int newstock, int published, double price, string type, string title, string author)
        {
            StreamWriter myFile = new StreamWriter(File.OpenWrite("Inventory.dat"));


            myFile.WriteLine(id);
            myFile.WriteLine(newstock);
            myFile.WriteLine(published);
            myFile.WriteLine(price);
            myFile.WriteLine(type);
            myFile.WriteLine(title);
            myFile.WriteLine(author);

            myFile.Close();
        }
    }
}

Can someone compile this (or just paste code into compiler) and tell me why writeinv.write_one_record(ref id, ref newstock, ref published, ref price, ref type, ref title, ref author); says it has invalid arguments?

“The best overloaded method match for ‘as2.programs.write_one_record(int, int, int, double, string, string, string)’ has some invalid arguments.

Answer 1

You define write_one_record as

void write_one_record(int id, int newstock, int published, double price, string type, string title, string author)

-> No ref parameters

but you call it as

writeinv.write_one_record(ref id, ref newstock, ref published, ref price, ref type, ref title, ref author);

-> all ref parameters