List Distinct根据实体属性去重

集合中全是实体，怎么根据实体某一个属性来对比唯一性？

 

public class PeopleCompareByID : IEqualityComparer<CalendarResult>
    {
        public bool Equals(CalendarResult x, CalendarResult y)
        {
            if (x == null || y == null)
                return false;
            if (x.SC_ID == y.SC_ID)
                return true;
            else
                return false;
        }

        public int GetHashCode(CalendarResult obj)
        {
            if (obj == null)
                return 0;
            else
                return obj.SC_ID.GetHashCode();
        }
    }

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