c# - filtering IPTV list from selected countries and removed geo-blocked using LINQ

Free IPTV.cs

async void FileIOwithLINQ()
{
  const string FILE_PATH = "./Data/country.oneliner.m3u.txt";
  const string ODD_EVEN_SEPERATOR = "~";
  // const string OUTPUT_FILE_PATH = "./Output/country.oneliner.m3u.txt";
  const string OUTPUT_FILE_PATH = "./Output/caFilteredChannels.m3u";

  string[] lines = System.IO.File.ReadAllLines(FILE_PATH);
  // string FilterBy = "tvg-country=\"INT\" tvg-language=\"English\"";
  string[] FilterBys = {
    "tvg-country=\"US\"",
    "tvg-country=\"UK\" tvg-language=\"English\"",
    "tvg-country=\"CA\" tvg-language=\"English\"",
    "tvg-country=\"EUR\" tvg-language=\"English\"",
    "tvg-country=\"AU\" tvg-language=\"English\"",
    "tvg-country=\"FR\" tvg-language=\"English\"",
    "tvg-country=\"IT\"",
    "tvg-country=\"PH\""
  };
  string[] ExcludesBy = {"[Geo-Blocked]", "[Geo-blocked]"};

  // Display the file contents by using a foreach loop.
  System.Console.WriteLine("Contents of {0}; ", FILE_PATH);


  // // Write new Data to use: 
  // var combinedOneLiners = combineOddEvenLine_into_OneLiner(lines, ODD_EVEN_SEPERATOR);
  // foreach (string line in combinedOneLiners)
  // {
  //       await fileWriteLineAsync(line, OUTPUT_FILE_PATH);
  // }



  // Filter as string[] by .Any<>;
  Console.WriteLine("\n\n" + FilterBys);
  var linesToWrite = lines.Where(x => FilterBys.Any(f => x.Contains(f) && !ExcludesBy.Any(e => x.Contains(e))));
  foreach (string line in linesToWrite)
  {
    Console.WriteLine("ExcludesBy found! \t" + line);
    string[] lineSplits = line.Split(ODD_EVEN_SEPERATOR);
    foreach (var lineSplit in lineSplits)
    {
      await fileWriteLineAsync(lineSplit, OUTPUT_FILE_PATH);
    }
  }


  // Keep the console window open in debug mode.
  Console.WriteLine("Press any key to exit.");
  System.Console.ReadKey();


}

string[] combineOddEvenLine_into_OneLiner(string[] lines, string seperator)
{
  List<string> oneLiners = new List<string>();
  const string MARKER_AS_ODD = "#EXTINF:";
  string oddValue = string.Empty;
  foreach (var line in lines)
  {
    if(line.Contains(MARKER_AS_ODD))
    {
      oddValue = line;
      continue;
    }

    oneLiners.Add(oddValue + seperator + line);        
  }
  return oneLiners.ToArray();
}

async Task fileWriteLineAsync(string lineToWrite, string fileWhereToWrite)
{
    // Always new file:
    // using StreamWriter file = new(fileWhereToWrite);
    // Create new file or Append if exists:
    using StreamWriter file = new(fileWhereToWrite, append: true);

    await file.WriteLineAsync(lineToWrite);
}