How in C# to organize a search in a file and assign strings to the fields of an object?

Question

C++ / C#

Hello. There is a class that creates book objects, with fields: authors (array), title, publisher, year of publication, date of issue of the book, return date. I uploaded all these data to the file, I will give the code below. The question is how to organize the output of this information, at least by name, I will further improve it. Is it better to search for a line in a file and then output the next 5 lines, or to throw the entire file into an array of objects and search there already?
Here is the code that is already there (by the way, everything is on the form):

namespace WindowsFormsApp1
{
    public partial class Form1 : Form
    {
        string path = @"U:\Study\Практика по программированию\Прога\Date.txt";

        public Form1()
        {
            InitializeComponent();
        }

        public void button1_Click(object sender, EventArgs e)
        {
            Book book = new Book(textBox1.Text.Split(' '), textBox2.Text, textBox3.Text, Int32.Parse(textBox4.Text), dateTimePicker1.Value, dateTimePicker2.Value);
            GetInfo(book);

            using (FileStream fstream = new FileStream($"{path}", FileMode.Append, FileAccess.Write))
            {
                string Author = "";
                for (int i = 0; i < book.Author_name.Length; i++)
                {
                    Author += book.Author_name[i].ToString() + " ";
                }
                byte[] input = Encoding.Default.GetBytes(Author + "\n" + book.Book_name.ToString() + "\n" + book.Publishing_house.ToString() + "\n" + book.Year.ToString() + "\n" + book.Date_of_issue.ToString() + "\n" + book.Repayment_period.ToString() + "\n" + "\n");
                fstream.Write(input, 0, input.Length);
            }
        }

        public void button2_Click(object sender, EventArgs e)
        {
            Book book = new Book();

            string text = "";
            using (StreamReader fs = new StreamReader(path))
            {
                while (true)
                {
                    // Читаем строку из файла во временную переменную.
                    string temp = fs.ReadLine();

                    // Если достигнут конец файла, прерываем считывание.
                    if (temp == null) break;
  
                    // Пишем считанную строку в итоговую переменную.
                    if (textBox5.Text == temp) {

                    }
                }
            }
        }

        public void GetInfo(Book b)
        {
            textBox7.Text = "";
            for (int i = 0; i < b.Author_name.Length; i++)
            {
                textBox7.Text += b.Author_name[i].ToString() + "\r\n";
            }
            textBox8.Text = b.Book_name.ToString();
            textBox9.Text = b.Publishing_house.ToString();
            textBox10.Text = b.Year.ToString();
            dateTimePicker3.Value = b.Date_of_issue;
            dateTimePicker4.Value = b.Repayment_period;
        }
    }

    public class Book
    {
        public string[] Author_name { get; set; }
        public string Book_name { get; set; }
        public string Publishing_house { get; set; }
        public int Year { get; set; }
        public DateTime Date_of_issue { get; set; }
        public DateTime Repayment_period { get; set; }

        public Book(){}

        public Book(string n)
        {
            Book_name = n;
        }

        public Book(string n, int y)
        {
            Book_name = n;
            Year = y;
        }

        public Book(string[] a, string n, string p, int y, DateTime d, DateTime r)
        {
            Author_name = a;
            Book_name = n;
            Publishing_house = p;
            Year = y;
            Date_of_issue = d;
            Repayment_period = r;
        }
    }
}

Program form:


File where data is saved:


Thanks in advance)

Answer 1

Look, I was looking for information on the search yesterday, I don’t remember exactly now, but it looks like your case.
1. You need to enable indexing on the disk where you store files.
2. When creating each file, you give it a Meta attribute, according to your fields in the class.
3. Use the standard Windows Search API
for searching 4. Save the search result in an ObjectDataSource
5. Place a DataGrid on the form and bind it to the ObjectDataSource
6. Use the "Output data" button to compose a query, execute it, fill in the ObjectDataSource
Link to a minimal example here
https ://stackoverflow.com/questions/34338465/how-t...

Answer 2

I advise you to study https://docs.microsoft.com/en-us/dotnet/csharp/pro...
Use built-in serialization.
1. To do this, change the properties to fields, add the attribute

[Serializable()]
public class Book
    {
        public string[] Author_name;
        ...
    }

2. Create a class-to-data converter. 3. Save an instance of the class to a file.
var formatter = new SoapFormatter();

using (var fileStream = File.Create(fileName))  formatter.Serialize(fileStream, book1);

Well, in the same way, you load the file into memory and read it.
If you need to save many classes, then you can use many files or, for example, serialize the entire database at once:

public class Library {
public Book Books[];
}

ps
There are also wonderful methods File.WriteLines, File.WriteAllText, File.ReadLines, File.ReadAllText.