Question

Here will explain in detail:
I have

public class Season
    {
        #region Public Variables

        private int _id;
        private string _seasonName;
        private int _startMonth;

        #endregion

        #region Public Properties 

        public int Id
        {
            get { return _id; }
            set { _id = value; }
        }

        public int StartMonth
        {
            get { return _startMonth; }
            set { _startMonth = value; }
        }

        public string SeasonName
        {
            get { return _seasonName; }
            set { _seasonName = value; }
        }

        #endregion

        #region Public Constructor

        public Season()
        {
            this._initialize();
        }

        public Season(string pSeasonName, int _pStartMonth,int pID)
        {
            this._initialize(pSeasonName, _pStartMonth, pID);
        }

        #endregion

    }

Next I have as show below

IList<Season> seaosns = new List<Season>();
seaosns.Add(new Season("Summer", 4, 1));
seaosns.Add(new Season("Winter", 6, 2));
seaosns.Add(new Season("MidSummer", 10, 1));

Here i need to check , if Ids are repeated in Ilist Items. This can be done by using For Loop, but need to know is there any other solution.

Thanks in Advance.

Answer 1

The most appropriate way to do that is to store the items (either instead, or in addition) in a Dictionary<int,Season>, using the unique property (Id) as a key in the dictionary. Then you have an O(1) lookup both to test existence, and to fetch by key (Id). Note, however, that a dictionary is not ordered – meaning, it does not guarantee to respect either insertion order, or key order. The order is not defined – so if you need them in a particular order you might need to hold that separately.