praktikum1/vr21/Program.cs

using System;
using System.Collections;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Xml;
using System.Xml.Serialization;
using Microsoft.SqlServer.Server;

namespace vr21
{
    [XmlRoot("Recipes")]
    public class Recipes
    {
        [XmlElement("Recipe")]
        public List<Recipe> RecipeList { get; set; }

        public Recipes()
        {
            RecipeList = new List<Recipe>();
        }
    }

    public class Recipe
    {
        [XmlElement("Name")]
        public string Name { get; set; }

        [XmlElement("Ingredient")]
        public List<Ingredient> IngredientsList { get; set; }

        [XmlElement("Step")]
        public List<string> StepList { get; set; }

        public Recipe()
        {
            IngredientsList = new List<Ingredient>();
            StepList = new List<string>();
        }

        public Recipe(string name)
        {
            Name = name;
            IngredientsList = new List<Ingredient>();
            StepList = new List<string>();
        }

        public Recipe(string name, List<Ingredient> ingredients)
        {
            Name = name;
            IngredientsList = ingredients;
            StepList = new List<string>();
        }
    }

    public class Ingredient
    {
        [XmlElement("Name")]
        public string Name { get; set; }

        [XmlElement("Amount")]
        public int Amount { get; set; }

        public Ingredient(string name)
        {
            Name = name;
            Amount = 1;
        }

        public Ingredient(string name, int amount)
        {
            Name = name;
            Amount = amount;
        }
    }
    class Program
    {
        static void Main(string[] args)
        {
            var recipes = new Recipes();
            recipes.RecipeList.Add(new Recipe("Supp"));
            XmlSerializer serializer = new XmlSerializer(typeof(Recipes));

            var xml = "";

            using (var sww = new StringWriter())
            {
                using (XmlWriter writer = XmlWriter.Create(sww))
                {
                    serializer.Serialize(writer, recipes);
                    xml = sww.ToString(); // Your XML
                }
            }
            Console.WriteLine(xml);
        }
    }
}