如何读取 txt 文件中的行，然后在 TextBox VB.NET 中仅显示某些字符？

Question

I am trying to search for, then display a specific line in a.ino file then display that in a TextBox. First I write many lines to a text file and once the vb.net program is closed I would like to then read from the same file. This is so if I have 50 textboxes I dont have remember what order everthing goes in. I can read from the file and make 1 change. So far I can write everything to file I need. So next step is to read from it. Any advice here is much appreciated.

So far everything is just created with normal objectwriter and so on

When I create the file I am only inserting the textbox info amongst other text below is an example. Idealy read the charater '49' and then display what i wrote in text box. 49 is what I would search for and then display nuts when i read from the file

The code is pretty staright forward to write to a text file

Public Class Form1
    Private Sub BtnWrite_Click(sender As Object, e As EventArgs) Handles BtnWrite.Click
        Dim filepath As String = "C:\temp\test.txt"
        If System.IO.File.Exists(filepath) = True Then
            Dim objWriter As New System.IO.StreamWriter(filepath)
            objWriter.Write("#include <Arduino.h>" & vbCrLf)
700 line inbetween
            objWriter.Close()
            MessageBox.Show("File Create")
        Else
            MessageBox.Show("File Does Not Exist")
        End If
    End Sub

The text file saves as

if(nuts_state){strip.setPixelColor(49, red);strip.show();delay(0);}
else{strip.setPixelColor(0, off);strip.show();delay(0);}

Answer 1

Think about storing the data in a Dictionary allowing you to use key-value pairs:

Dictionary<string, string> dictionary = new Dictionary<string, string>();
dictionary.Add("1", "Some value 1");
dictionary.Add("2", "Something");

Then using a JSON serialization library, like Json.Net, write the dictionary out to a file:

string json = JsonConvert.SerializeObject(dictionary);
File.WriteAllText("File.Txt", json);

Then read it back in using the JSON library:

Dictionary<string, string> previousDictionary = 
JsonConvert.DeserializeObject<Dictionary<string, string> (File.ReadAllText("File.txt"));

Answer 2

I did not need to any of this. Usersavforms allows you to enter values for the textboxes then recall them

Sub SaveFormState(ByVal SourceForm As Form)