questions/47611954/parse-xml-file-and-grab-value-from-parent-node

CSharp · Console

/Program.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Xml.Serialization;
using System.Xml;
using System.IO;
using System.Diagnostics;
using System.Collections.ObjectModel;
using System.Threading;
using System.ComponentModel;
using System.Xml.Linq;
using System.Reflection;
using System.Data;
using System.Xml.Schema;
using System.Text.RegularExpressions;
using System.Net;
using System.Xml.XPath;
using System.Globalization;
using System.ComponentModel.DataAnnotations;
using System.Collections;
using System.Runtime.InteropServices;
using System.Runtime.Serialization;

    // https://stackoverflow.com/questions/47611954/parse-xml-file-and-grab-value-from-parent-node
    public class Book
    {
        public string Id { get; set; }

        public string Author { get; set; }
        public string Title { get; set; }
        public Genre Genre { get; set; }
        public decimal Price { get; set; }
        public DateTime PublishDate { get; set; }
        public string Description { get; set; }
    }

    public enum Genre
    {
        Computer,
        Fantasy,
    };

    class TestClass
    {
        public static void Test()
        {
            var filePath = "test.xml";
            try
            {
                File.WriteAllText(filePath, GetXml());
                Test(filePath);
            }
            finally
            {
                try
                {
                    File.Delete(filePath);
                }
                catch (Exception)
                {
                }
            }
        }

        public static void Test(string filePath)
        {
            XDocument xmlDoc = XDocument.Load(filePath);

            var dupa = xmlDoc
                .Descendants("book")
                .Select(x => new Book
                {
                    Id = (string)x.Attribute("bookid"),
                    Author = (string)x.Element("author"),
                    Title = (string)x.Element("title"),
                    Genre = (Genre)Enum.Parse(typeof(Genre), (string)x.Element("genre")),
                    Price = (decimal)x.Element("price"),
                    PublishDate = (DateTime)x.Element("publish_date"),
                    Description = (string)x.Element("description"),
                }).ToList();

            Console.WriteLine("\nResult of deserializing and reserializing the List<Book>: ");
            Console.WriteLine(dupa.GetXml(false));
        }

        static string GetXml()
        {
            var xml = @"<?xml version=""1.0""?>
<catalog>
    <book id=""bk101"">
        <author>Gambardella, Matthew</author>
        <title>XML Developer's Guide</title>
        <genre>Computer</genre>
        <price>44.95</price>
        <publish_date>2000-10-01</publish_date>
        <description>An in-depth look at creating applications with XML.</description>
    </book>
    <book id=""bk102"">
        <author>Ralls, Kim</author>
        <title>Midnight Rain</title>
        <genre>Fantasy</genre>
        <price>5.95</price>
        <publish_date>2000-12-16</publish_date>
        <description>A former architect battles corporate zombies, an evil sorceress, and her own childhood to become queen of the world.</description>
    </book>
</catalog>
";
            return xml;
        }
    }

    public class AssertionFailedException : System.Exception
    {
        public AssertionFailedException() : base() { }

        public AssertionFailedException(string s) : base(s) { }
    }

    public static class Assert
    {
        public static void IsTrue(bool value)
        {
            IsTrue(value, "failed");
        }

        public static void IsTrue(bool value, string message)
        {
            if (value == false)
                throw new AssertionFailedException(message ?? "failed");
        }
    }

    public static class XmlSerializationHelper
    {
        public static T LoadFromXml<T>(this string xmlString, XmlSerializer serial = null)
        {
            serial = serial ?? new XmlSerializer(typeof(T));
            using (var reader = new StringReader(xmlString))
            {
				return (T)serial.Deserialize(reader);
            }
        }

        public static string GetXml<T>(this T obj, bool omitStandardNamespaces)
        {
			return obj.GetXml(null, omitStandardNamespaces);
        }
		
        public static string GetXml<T>(this T obj, XmlSerializer serializer = null, bool omitStandardNamespaces = false)
        {
            XmlSerializerNamespaces ns = null;
            if (omitStandardNamespaces)
            {
                ns = new XmlSerializerNamespaces();
                ns.Add("", ""); // Disable the xmlns:xsi and xmlns:xsd lines.
            }			
            using (var textWriter = new StringWriter())
            {
                var settings = new XmlWriterSettings() { Indent = true }; // For cosmetic purposes.
                using (var xmlWriter = XmlWriter.Create(textWriter, settings))
                    (serializer ?? new XmlSerializer(obj.GetType())).Serialize(xmlWriter, obj, ns);
                return textWriter.ToString();
            }
        }
    }
										
	public class Program
	{
		public static void Main()
		{
			Console.WriteLine("Environment version: " + Environment.Version);
			Console.WriteLine();

			try
			{
				TestClass.Test();
			}
			catch (Exception ex)
			{
				Console.WriteLine("Uncaught exception: ");
				Console.WriteLine(ex);
				throw;
			}
		}
	}