Добавление в словарь большого количества значений

public Dictionary<string, string> logos = new Dictionary<string, string>
        {
            {"Zero","H1VboxDJC7sE7x3nKXoYT0X5r4LIqD.png"},
    {"First","hFj4tnC5uqAgpod3doHnJGZxgZXaiP.png"},
    {"Second","FtLnmUwjG18XJFEKYvLKjwUq1gwHVZ.png"},
    {"Third","45atLSHAjViMISJinK8A0jQA34I0Fi.png"},
    {"и т.д.","geM35mbIzNqzz3LBvxnViw2EviT2BW.png"}
    };

Dictionary<string, string> groups = new Dictionary<string, string>();
string[] Groupfile = File.ReadAllLines("Groups.txt", Encoding.Default);
 
            for (int i = 0; i < Groupfile.Length; i++)
            {
                Regex GetGroup = new Regex("{\"(.*)\",\"(.*)\"}");
                Match name = GetGroup.Match(Groupfile[i]);
                if (!groups.ContainsKey(name.Groups[1].ToString())) groups.Add(name.Groups[1].ToString(),name.Groups[1].ToString());
             }

        static void Main(string[] args)
        {
            var s = @"{""Zero"",""H1VboxDJC7sE7x3nKXoYT0X5r4LIqD.png""},
{""First"",""hFj4tnC5uqAgpod3doHnJGZxgZXaiP.png""},
{""Second"",""FtLnmUwjG18XJFEKYvLKjwUq1gwHVZ.png""},
{""Third"",""45atLSHAjViMISJinK8A0jQA34I0Fi.png""},";
 
            Dictionary<string, string> logos = new Dictionary<string, string>();
 
            MatchCollection collection = Regex.Matches(s, "{\"(.*?)\",\"(.*?)\"}");
            foreach (Match item in collection)
            {
                logos[item.Groups[1].Value] = item.Groups[2].Value;
            }
 
            foreach (var item in logos)
            {
                Console.WriteLine($"{item.Key} {item.Value}");
            }
            Console.ReadLine();
        }

var dic = File.ReadAllLines("file.txt")
            .Select(line => line.Trim(new[] { '{', '}' }).Split(',').Select(x => x.Trim('\"')).ToArray())
            .ToDictionary(x => x[0], x => x[1]);