linq 中Distinct去除重复数据

调用方法：        IList<BrandInfo> list = Brandlist.Where(c => c.AreaID == a.AreaID).Distinct(new Comparint()).ToList();

    //去除物业下区域中相同分类（CategoryIDs）

    public class Comparint : IEqualityComparer<BrandInfo>

    {

        public bool Equals(BrandInfo x, BrandInfo y)

        {

            if (x == null && y == null)

                return false;

            return x.GetLangInfo(LanguageTypeEnum.Chinese).CategoryIDs == y.GetLangInfo(LanguageTypeEnum.Chinese).CategoryIDs;

        }

        public int GetHashCode(BrandInfo obj)

        {

            return obj.ToString().GetHashCode();

        }

    }