ListMaster.cs

using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace myClasses
{
    public class ListMaster
    {

        public static string getLineFromFile(string filePath, int index)
        {
            string[] lines = File.ReadAllLines(filePath);
            return lines[index];
        }

        public static void deleteLineFromFile(string filePath, int lineNumber)
        {
            List<string> list = File.ReadAllLines(filePath).ToList();
            list.RemoveAt(lineNumber);
            File.WriteAllLines(filePath, list.ToArray());
        }

        public static void deleteDoubles(string filePath)
        {
            string[] lines = File.ReadAllLines(filePath);
            File.WriteAllLines(filePath, lines.Distinct().ToArray());
        }

        public static void deleteEmptyLines(string filePath)
        {
            string line;
            List<string> list = File.ReadAllLines(filePath).ToList();
            for (int i = 0; i < list.Count; i++)
            {
                line = list[i];
                if (line == "") list.RemoveAt(i);
            }
            File.WriteAllLines(filePath, list.ToArray());
        }

        public static string[] deleteEmptyLines(string[] array)
        {
            List<string> list = array.ToList();
            int index = 0;
            foreach (string line in list) {
                if (line == "") list.RemoveAt(index);
                index++;
            }
            return list.ToArray();
        }

        public static int getListCount(string path) {

            string[] array = File.ReadAllLines(path);
            string[] arrayClean = deleteEmptyLines(array);
            return arrayClean.Length;
        }

        public static void clearFile(string path) {
            File.WriteAllText(path, String.Empty);
        }

        public static string miltiReplace(string text, string[] replaceArray) {
            if (replaceArray.Contains(";")){
                foreach (string item in replaceArray) {
                    string[] mas = item.Split(';');
                    text = text.Replace(mas[0], mas[1]);
                }
                return text;
            }
            else return null;
        }

    }
}