ListComparer

ListComparer.cs

public class MaterielCodesComparer : IEqualityComparer<EntMaterielCodes>
{
    public bool Equals(EntMaterielCodes x, EntMaterielCodes y)
    {
        if (Object.ReferenceEquals(x, y)) return true;
        return x != null && y != null && x.RFIDCode == y.RFIDCode && x.UniqueCode == y.UniqueCode;
    }

    public int GetHashCode(EntMaterielCodes obj)
    {
        int hashStudentId = obj.RFIDCode.GetHashCode();
        int hashScore = obj.UniqueCode.GetHashCode();
        return hashStudentId ^ hashScore;
    }
}

public class Sample
{
    private void Run()
    {
        var oldArr = codes.Select(x => new EntMaterielCodes { RFIDCode = x.RFIDCode, UniqueCode = x.UniqueCode }).ToArray();// 以前的rfid码
        var newArr = newCodes.Select(x => new EntMaterielCodes { RFIDCode = x.RFID, UniqueCode = x.UniqueCode }).ToArray(); // 当前传入的rfid码

        // 亏
        var deficitList = oldArr.Except(newArr, new MaterielCodesComparer());

        // 盈
        var surplusList = newArr.Except(oldArr, new MaterielCodesComparer());

        // 正常
        var intersectList = newArr.Intersect(oldArr, new MaterielCodesComparer());
    }
}