Add project files.

hszf-z2-gyakorlas.sln

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+
+Microsoft Visual Studio Solution File, Format Version 12.00
+# Visual Studio Version 17
+VisualStudioVersion = 17.14.36623.8 d17.14
+MinimumVisualStudioVersion = 10.0.40219.1
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "hszf-z2-gyakorlas", "hszf-z2-gyakorlas\hszf-z2-gyakorlas.csproj", "{EF0023E3-A1F1-4755-944B-3DED4BAE47EC}"
+EndProject
+Global
+	GlobalSection(SolutionConfigurationPlatforms) = preSolution
+		Debug|Any CPU = Debug|Any CPU
+		Release|Any CPU = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(ProjectConfigurationPlatforms) = postSolution
+		{EF0023E3-A1F1-4755-944B-3DED4BAE47EC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{EF0023E3-A1F1-4755-944B-3DED4BAE47EC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{EF0023E3-A1F1-4755-944B-3DED4BAE47EC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{EF0023E3-A1F1-4755-944B-3DED4BAE47EC}.Release|Any CPU.Build.0 = Release|Any CPU
+	EndGlobalSection
+	GlobalSection(SolutionProperties) = preSolution
+		HideSolutionNode = FALSE
+	EndGlobalSection
+	GlobalSection(ExtensibilityGlobals) = postSolution
+		SolutionGuid = {15B28962-E262-496E-B7F8-DC1EBB7434E9}
+	EndGlobalSection
+EndGlobal

hszf-z2-gyakorlas/Program.cs

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+using Microsoft.EntityFrameworkCore;
+using Microsoft.EntityFrameworkCore.Metadata.Internal;
+using Newtonsoft.Json;
+using System;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+using System.Reflection;
+using System.Text.Json.Serialization;
+using System.Xml.Linq;
+using System.Xml.Serialization;
+
+namespace hszf_z2_gyakorlas
+{
+    public class category
+    {
+        [Key]
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public string Name { get; set; }
+        [Required]
+        public virtual ICollection<product> Products { get; set; }
+
+        public category(string name, List<product> products)
+        {
+            this.Name = name;
+            this.Products = products;
+        }
+
+        public category()
+        {
+            Products = new HashSet<product>();
+        }
+
+    }
+
+    public class product
+    {
+        public product(string sku, string name, int price)
+        {
+            this.Sku = sku;
+            this.Name = name;
+            this.Price = price;
+        }
+
+        public product()
+        {
+
+        }
+
+        [Key]
+        [RequiredNonEmpty]
+        [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
+        public string Sku { get; set; }
+        public string Name { get; set; }
+        [CorrectPrice(10, 20000)]
+        public int Price { get; set; }
+    }
+
+    public class RequiredNonEmpty : Attribute {
+        
+    }
+
+    public class CorrectPrice : Attribute
+    {
+        int minValue;
+        int maxValue;
+
+        public CorrectPrice(int minValue, int maxValue)
+        {
+            this.minValue = minValue;
+            this.maxValue = maxValue;
+        }
+
+        public int MinValue { get => minValue; set => minValue = value; }
+        public int MaxValue { get => maxValue; set => maxValue = value; }
+    }
+
+
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("Hello, World!");
+            string[] sorok = File.ReadAllLines("products.xml");
+
+            XDocument doc = XDocument.Load("products.xml");
+            List<category> categories = new List<category>();
+            foreach (var item in doc.Descendants("Categories").Descendants("Category"))
+            {
+                string nev = item.Element("Name").Value;
+                List<product> array2 = new List<product>();
+                foreach (var item2 in item.Descendants("Products").Descendants("Product"))
+                {
+                    array2.Add(new product(item2.Element("Sku").Value, item2.Element("Name").Value, int.Parse(item2.Element("Price").Value)));
+                }
+                categories.Add(new category(nev, array2));
+
+            }
+
+            Console.WriteLine(Validate.Valid(categories));
+
+            Console.WriteLine(Validate.ValidPrice(categories));
+
+            string connStr = @"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=persondb;Integrated Security=True;MultipleActiveResultSets=true";
+
+
+            CategoryDbContext ctx = new CategoryDbContext();
+
+            foreach (var item in categories.Select(x => new category(x.Name, x.Products.Where(x => x.Price > 10000).ToList())))
+            {
+                ctx.Categories.Add(item);
+            }
+            ctx.SaveChanges();
+
+            string asd = JsonConvert.SerializeObject(categories, Formatting.Indented);
+            Console.WriteLine(asd);
+            File.WriteAllLines("categories.json", [asd]);
+
+
+            List<category> categories1 = JsonConvert.DeserializeObject<List<category>>(asd);
+            Console.WriteLine((categories1[1].Products).ToList()[0].Name);
+        }
+    }
+
+    public class Validate
+    {
+        public static bool Valid(List<category> categories)
+        {
+            foreach (var category in categories)
+            {
+                foreach (var item in category.Products)
+                {
+                    Type t = item.GetType();
+                    PropertyInfo[]? propertyInfos = t.GetProperties();
+                    if (propertyInfos is not null)
+                    {
+                        foreach (PropertyInfo propertyInfo in propertyInfos)
+                        {
+                            if (propertyInfo.GetCustomAttribute<RequiredNonEmpty>() is not null && (propertyInfo.GetValue(item) == null || propertyInfo.GetValue(item) == ""))
+                            {
+                                return false;
+                            }
+                        }
+                    }
+                }
+            }
+            return true;
+        }
+
+        public static bool ValidPrice(List<category> categories)
+        {
+            foreach (var category in categories)
+            {
+                foreach (var item in category.Products)
+                {
+                    Type t = item.GetType();
+                    PropertyInfo[]? propertyInfos = t.GetProperties();
+                    if (propertyInfos is not null)
+                    {
+                        foreach (PropertyInfo propertyInfo in propertyInfos)
+                        {
+                            CorrectPrice? correctPrice = propertyInfo.GetCustomAttribute<CorrectPrice>();
+                            if (correctPrice is not null && ((int)propertyInfo.GetValue(item) > correctPrice.MaxValue  || (int)propertyInfo.GetValue(item) < correctPrice.MinValue))
+                            {
+                                return false;
+                            }
+                        }
+                    }
+                }
+            }
+            return true;
+        }
+    }
+
+    public class CategoryDbContext : DbContext
+    {
+        public DbSet<category> Categories { get; set; }
+        public CategoryDbContext()
+        {
+            Database.EnsureDeleted();
+            Database.EnsureCreated();
+        }
+        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
+        {
+            string connStr = @"Data Source=(LocalDB)\MSSQLLocalDB;Initial Catalog=categoriesdb;Integrated Security=True;MultipleActiveResultSets=true";
+            optionsBuilder.UseSqlServer(connStr);
+            base.OnConfiguring(optionsBuilder);
+        }
+    }
+
+}

hszf-z2-gyakorlas/hszf-z2-gyakorlas.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net8.0</TargetFramework>
+    <RootNamespace>hszf_z2_gyakorlas</RootNamespace>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+  <ItemGroup>
+    <PackageReference Include="Microsoft.EntityFrameworkCore" Version="9.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Proxies" Version="9.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.SqlServer" Version="9.0.10" />
+    <PackageReference Include="Microsoft.EntityFrameworkCore.Tools" Version="9.0.10">
+      <PrivateAssets>all</PrivateAssets>
+      <IncludeAssets>runtime; build; native; contentfiles; analyzers; buildtransitive</IncludeAssets>
+    </PackageReference>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.4" />
+  </ItemGroup>
+
+  <ItemGroup>
+    <None Update="products.xml">
+      <CopyToOutputDirectory>PreserveNewest</CopyToOutputDirectory>
+    </None>
+  </ItemGroup>
+
+</Project>

hszf-z2-gyakorlas/products.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<ProductPackage>
+  <Categories>
+    <Category>
+      <Name>Coffee</Name>
+      <Products>
+        <Product><Sku>COF-1001</Sku><Name>Premium Arabica</Name><Price>12990</Price></Product>
+        <Product><Sku>COF-1002</Sku><Name>Extra Dark Roast</Name><Price>9990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Tea</Name>
+      <Products>
+        <Product><Sku>TEA-2001</Sku><Name>Green Tea</Name><Price>14990</Price></Product>
+        <Product><Sku>TEA-2002</Sku><Name>Black Tea</Name><Price>8990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Chocolate</Name>
+      <Products>
+        <Product><Sku>CHO-3001</Sku><Name>Dark Chocolate 85%</Name><Price>11990</Price></Product>
+        <Product><Sku>CHO-3002</Sku><Name>Milk Chocolate</Name><Price>4990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Biscuits</Name>
+      <Products>
+        <Product><Sku>BIS-4001</Sku><Name>Butter Cookies</Name><Price>10990</Price></Product>
+        <Product><Sku>BIS-4002</Sku><Name>Chocolate Chip</Name><Price>9990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Juice</Name>
+      <Products>
+        <Product><Sku>JUI-5001</Sku><Name>Orange Juice</Name><Price>6990</Price></Product>
+        <Product><Sku>JUI-5002</Sku><Name>Mango Juice</Name><Price>10990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Snacks</Name>
+      <Products>
+        <Product><Sku>SNA-6001</Sku><Name>Potato Chips</Name><Price>4990</Price></Product>
+        <Product><Sku>SNA-6002</Sku><Name>Nachos Cheese</Name><Price>11990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Water</Name>
+      <Products>
+        <Product><Sku>WAT-7001</Sku><Name>Mineral Water 0.5L</Name><Price>1990</Price></Product>
+        <Product><Sku>WAT-7002</Sku><Name>Mineral Water 1.5L</Name><Price>2490</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Energy Drinks</Name>
+      <Products>
+        <Product><Sku>ENE-8001</Sku><Name>Energy Boost</Name><Price>11990</Price></Product>
+        <Product><Sku>ENE-8002</Sku><Name>Zero Sugar Energy</Name><Price>10990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Beer</Name>
+      <Products>
+        <Product><Sku>BEE-9001</Sku><Name>Lager Classic</Name><Price>5990</Price></Product>
+        <Product><Sku>BEE-9002</Sku><Name>Craft IPA</Name><Price>12990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Wine</Name>
+      <Products>
+        <Product><Sku>WIN-10001</Sku><Name>Red Merlot</Name><Price>18990</Price></Product>
+        <Product><Sku>WIN-10002</Sku><Name>White Chardonnay</Name><Price>17990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Cheese</Name>
+      <Products>
+        <Product><Sku>CHE-11001</Sku><Name>Gouda</Name><Price>8990</Price></Product>
+        <Product><Sku>CHE-11002</Sku><Name>Parmesan</Name><Price>13990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Meat</Name>
+      <Products>
+        <Product><Sku>MEA-12001</Sku><Name>Beef Steak</Name><Price>25990</Price></Product>
+        <Product><Sku>MEA-12002</Sku><Name>Pork Sausage</Name><Price>9990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Fish</Name>
+      <Products>
+        <Product><Sku>FIS-13001</Sku><Name>Salmon Fillet</Name><Price>18990</Price></Product>
+        <Product><Sku>FIS-13002</Sku><Name>Tuna Can</Name><Price>6990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Vegetables</Name>
+      <Products>
+        <Product><Sku>VEG-14001</Sku><Name>Broccoli</Name><Price>4990</Price></Product>
+        <Product><Sku>VEG-14002</Sku><Name>Carrots</Name><Price>2990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Fruits</Name>
+      <Products>
+        <Product><Sku>FRU-15001</Sku><Name>Bananas</Name><Price>3990</Price></Product>
+        <Product><Sku>FRU-15002</Sku><Name>Apples</Name><Price>4490</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Dairy</Name>
+      <Products>
+        <Product><Sku>DAI-16001</Sku><Name>Whole Milk</Name><Price>2590</Price></Product>
+        <Product><Sku>DAI-16002</Sku><Name>Yogurt</Name><Price>3290</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Bread</Name>
+      <Products>
+        <Product><Sku>BRE-17001</Sku><Name>Wholegrain Bread</Name><Price>6990</Price></Product>
+        <Product><Sku>BRE-17002</Sku><Name>White Toast</Name><Price>5990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Electronics</Name>
+      <Products>
+        <Product><Sku>ELE-18001</Sku><Name>Wireless Headphones</Name><Price>29990</Price></Product>
+        <Product><Sku>ELE-18002</Sku><Name>Bluetooth Speaker</Name><Price>24990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Books</Name>
+      <Products>
+        <Product><Sku>BOO-19001</Sku><Name>Programming in C#</Name><Price>15990</Price></Product>
+        <Product><Sku>BOO-19002</Sku><Name>History of AI</Name><Price>18990</Price></Product>
+      </Products>
+    </Category>
+
+    <Category>
+      <Name>Games</Name>
+      <Products>
+        <Product><Sku>GAM-20001</Sku><Name>Chess Set</Name><Price>8990</Price></Product>
+        <Product><Sku>GAM-2002</Sku><Name>Video Game Controller</Name><Price>21990</Price></Product>
+      </Products>
+    </Category>
+  </Categories>
+</ProductPackage>