c＃从文件读取到数组并添加到列表框

Question

So this is a part of a university assignment that I am stuck on, I am to create a media player and the code I am currently struggling with should read from a .txt file into an array, and then it should read the track title into a listbox named Lst_genre, my code so far is as follows (I am quite new to the website so let me know if I need to put anything else.)

private void Form1_Load(object sender, EventArgs e)
{
      string[] readFromfile = File.ReadLines("filepathgoeshere").ToArray();
      ListBox listBox1 = new ListBox();
      // add items 
      Lst_Genre.Items.Add(readFromfile);
      // add to controls 
      Controls.Add(listBox1);
}

the format of the text file is as follows

2
hip hop // i am wanting this to the textbox
eminem- without me.mp3 // both mp3 files should show in Lst_genre
eminem- lose yourself.mp3

The genre name should read into a textbox above also but at the moment I am more concerned with the track names. Would be great if anybody could give some input as I am currently at a loss.

Answer 1

You have to extract data first:

var readFromFile = File
  .ReadLines("filepathgoeshere")
  .Skip(1)                                                  // Skip title 
  .Select(line => line.Substring(0, line.LastIndexOf(' '))) // get genre (not number) 
  .ToArray();                                               // we want an array

Then add all the items: AddRange :

Lst_Genre.Items.AddRange(readFromfile);

Edit 1 : As far as I can see from the comments

I have a textbox above my listbox to hold the genre name and the listbox should hold my track names

We actually have to provide data for two controls :

var allLines = File
  .ReadAllLines("filepathgoeshere");

then

// Top Line: genre name
myTextBox.Text = allLines[0]; 

// tracks
Lst_Genre.Items.AddRange(allLines
  .Skip(1)   // Here we skip top line (genre name?)
  .Select(line => line.Substring(0, line.LastIndexOf(' ')))
  .ToArray());

Edit 2 : According to the example provided:

var allLines = File
  .ReadAllLines("filepathgoeshere");

// Genre name is the second line (top one is id which we skip)
myTextBox.Text = allLines[1]; 

// in case you want to clear existing control, not creating a new one. 
Lst_Genre.Items.Clear();

// Tracks
Lst_Genre.Items.AddRange(allLines
  .Skip(2)     // Here we skip tow lines (id and genre name)
  .ToArray());