lectures/202409/ConsoleApp1/Program.cs

using ConsoleApp1.Animals;
using ConsoleApp1.Cards;
using System.Text;
using System.Xml;

namespace ConsoleApp1
{
    internal class Program
    {
        static void Main(string[] args)
        {
            // h_PlayCards();
            //Animal animal = new Animal();
            //Animal.MilkConsumerAreaInfo info = animal.GetAreaInfo();
            //h_Afd();\
            // h_InfoIO();
            // File.Delete("123.csv");
            // string sFn = "123.csv";
            //h_WriteCsv(sFn);
            //h_ReadCsv(sFn);

            string sXmlFn = "123.xml";
            h_WriteXml(sXmlFn);
            h_ReadXml(sXmlFn);
            Console.ReadKey();
        }

        private static void h_WriteXml(string sXmlFn)
        {
            if (File.Exists(sXmlFn)) File.Delete(sXmlFn);
            if (File.Exists(sXmlFn)) return;
            Console.WriteLine(DateTime.Now);
            using (Stream ms = File.Create(sXmlFn))
            {
                using (XmlWriter sw = XmlWriter.Create(ms))
                {
                    sw.WriteStartDocument();
                    sw.WriteStartElement("root");
                    sw.WriteAttributeString("versionMy", "1.0");
                    sw.WriteStartElement("items");
                    for (int ii = 0; ii < 2999999; ii++)
                    {
                        sw.WriteStartElement("item");
                        sw.WriteAttributeString("attr1", $"{ii}");
                        sw.WriteString("content");
                        sw.WriteEndElement();
                    }

                    sw.WriteEndElement();
                    sw.WriteEndElement();
                    sw.WriteEndDocument();
                }
            }

            FileInfo fi = new FileInfo(sXmlFn);
            Console.WriteLine($"{fi.Length / 1024 / 1024} Mb / {DateTime.Now}");

        }


        private static void h_ReadXml(string sXmlFn)
        {
            Console.WriteLine($"start {DateTime.Now}");
            XmlDocument? x = new XmlDocument();
            x.Load(sXmlFn);
            // x.ChildNodes[0].ChildNodes[0].Attributes[0].Value...
            Console.WriteLine($"end {DateTime.Now}");
        }

        private static void h_ReadCsv(string sFn)
        {
            using (Stream ms = File.OpenRead(sFn))
            {
                using (StreamReader sr = new StreamReader(ms, System.Text.Encoding.UTF8))
                {
                    sr.ReadLine();
                    int iCount = 0;
                    string sLine = String.Empty;
                    Console.WriteLine(sr.ReadLine());
                    while (!sr.EndOfStream)
                    {
                        iCount++;
                        sLine = sr.ReadLine();
                    }
                    Console.WriteLine($"{iCount} // {sLine}");
                }
            }
        }

        private static void h_WriteCsv(string sFn)
        {
            if (File.Exists(sFn)) return;
            using (Stream ms = File.Create(sFn))
            {
                using (StreamWriter sw = new StreamWriter(ms, System.Text.Encoding.UTF8))
                {
                    sw.WriteLine($"num;date");
                    for (int ii = 0; ii < 99999999; ii++)
                    {
                        sw.WriteLine($"{ii};{DateTime.Now:mm.ss}");
                    }
                }

            }
            FileInfo fi = new FileInfo(sFn);
            Console.WriteLine(fi.Length);

        }

        private static void h_InfoIO()
        {
            var pp = typeof(Program).GetType().Assembly.Location;
            string sDirectory = Path.GetDirectoryName(pp);
            // Path.GetFileNameWithoutExtension()
            // Path.ChangeExtension()
            // DirectoryInfo di = new DirectoryInfo(sDirectory);
            // di.EnumerateFiles();
            // Directory.EnumerateFiles()

            using (MemoryStream ms = new MemoryStream(new byte[40960]))
            {
                ms.Seek(0, SeekOrigin.Begin);
                byte[] buffer = new byte[4096];
                ms.Read(buffer, 1, 4096);
                int iB = ms.ReadByte();
                using (StreamWriter sw = new StreamWriter(ms, System.Text.Encoding.UTF8))
                {
                    sw.WriteLine("qwr");
                }
                using (StreamReader sw = new StreamReader(ms, System.Text.Encoding.UTF8))
                {
                    string sLine = sw.ReadLine();
                }

            }
            //Stream pFile = null;
            //try
            //{
            //    pFile = File.Create("sa");
            //    pFile.Seek(0, SeekOrigin.Begin);
            //    byte[] buffer = new byte[4096];
            //    pFile.Read(buffer, 1, 4096);
            //    int iB = pFile.ReadByte();
            //} finally
            //{
            //    pFile?.Dispose();
            //}
            using (FileStream fs = File.Create("sa"))
            {
                fs.Seek(0, SeekOrigin.Begin);
                byte[] buffer = new byte[4096];
                fs.Read(buffer, 1, 4096);
                int iB = fs.ReadByte();
            }
            byte[] bt = File.ReadAllBytes("fn");
            string sText = File.ReadAllText("fn", Encoding.UTF8);
            string[] arLines = File.ReadAllLines("fn", Encoding.UTF8);
        }

        public static void h_XmlSax()
        {
            string sContent = @"";
        }

        private static void h_Afd()
        {
            int ii = 0;
            Console.WriteLine(ii);
            h_Afd1(ii);
            Console.WriteLine(ii);
            h_Afd2(ref ii);
            Console.WriteLine(ii);
            h_Afd3(out ii);
            Console.WriteLine(ii);

            List<int> ll = new List<int>();
            h_Lfd(ll);

            //h_CountOddAndEven(ll);
        }

        private static bool h_CountOddAndEven(List<int> ll,
            out int iEvenCount, out int iOddCount)
        {
            throw new NotImplementedException();
        }

        private static void h_Lfd(List<int> ll)
        {
            ll.Add(1);
            ll.Add(2);

        }

        private static void h_Afd1(int ii)
        {
            ii++;
        }
        private static void h_Afd2(ref int ii)
        {
            ii++;
        }
        private static void h_Afd3(out int ii)
        {
            ii = 10;
        }

        private static void h_PlayCards()
        {
            CardSuit myCardType = CardSuit.Черви;
            Console.WriteLine($"{myCardType}");

            Card[] arCards = new Card[36];
            CardSuit[] arColors = (CardSuit[])Enum.GetValues(typeof(CardSuit));
            CardValue[] arValues = (CardValue[])Enum.GetValues(typeof(CardValue));

            int ii = 0;
            foreach (CardSuit color in arColors)
            {
                foreach (CardValue value in arValues)
                {
                    Card _card = new Card(color, value);
                    arCards[ii] = _card;
                    ii++;
                }
            }

            foreach (var card in arCards)
            {
                Console.WriteLine($"{card.Suit}:{card.Value}");
            }
        }
    }
}