GrandStream1620 AddressBook XML作成

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

namespace AddressBook
{
    internal class AddressBook
    {
        public List list = new List();
        string directory = string.Empty;
        public AddressBook(string directory) 
        {
            this.directory = directory;
        }

        public void GetItem(string filename)
        {
            using (var sr = new StreamReader(this.directory + filename, System.Text.Encoding.UTF8))
            {
                int i = 0;
                while (sr.Peek() > -1)
                {
                    string line = sr.ReadLine();

                    var array = line.Split(',');

                    if (i > 0)
                    {
                        list.Add(new Contact { 姓 = array[0], 名 = array[1], セイ = array[2], メイ = array[3], 電話 = array[4], FAX = array[5], 携帯 = array[6], 郵便番号 = array[7], 都道府県 = array[8], 市区町村 = array[9], 番地 = array[10], その他住所 = array[11], メールアドレス = array[12] });
                    }

                    i++;
                }
            }
        }

        public int MakeContactFileForGrandStreamPhone(string outboundPrefix)
        {
            int i = 1;

            string crlf = @"\r\n";

            using (var sw = new StreamWriter(this.directory + "phonebook.xml", false, System.Text.Encoding.UTF8))
            {
                string contactStr = "\n";

                contactStr += "\n\n4\nBlacklist\n\n\n5\nWhitelist\n\n\n6\nWork\n\n\n7\nFriends\n\n\n8\nFamily\n\n";

                foreach (var item in list)
                {
                    contactStr += "\n";
                    contactStr += "" + i.ToString() + "\n";
                    contactStr += "" + item.名 + "\n";
                    contactStr += "" + item.姓 + "\n";
                    contactStr += "0\n";
                    contactStr += "\n";
                    contactStr += "" + outboundPrefix + item.電話.Replace(" ", "") + "\n";
                    contactStr += "1\n";
                    contactStr += "\n";
                    contactStr += "\n";
                    contactStr += "" + outboundPrefix + item.携帯.Replace(" ", "") + "\n";
                    contactStr += "1\n";
                    contactStr += "\n";
                    contactStr += "0\r\n";
                    contactStr += "\n";

                    i++;
                }

                contactStr += "";

                sw.WriteLine(contactStr);
            }


            return i - 1;
        }

        public void SendPhoneBookXMLToWebSite(string website)
        {
        }
    }
}