method constructor function example C#

example-7.cs

        List<string> entries;

        public Logger()
        {
            entries = new List<string>();
            AddLogMethod(msg => entries.Add(msg)); //or we can use: AddLogMethod(entries.Add);
        }

        //Example for Func

        public List<string> Filter(Func<string,bool> condition)
        {
            if(condition == null)
            {
                throw new ArgumentNullException(nameof(condition));
            }
            return entries.Where(condition).ToList();
        }

        //Example for Predicate
        public List<string> Filter(Predicate<string> condition)
        {
            if (condition == null)
            {
                throw new ArgumentNullException(nameof(condition));
            }
            return entries.FindAll(condition);
        }