Question

我有一系列公司及其数据（地址，电子邮件，电话，活动？（无论它们是否在我们的系统中有效））。我可以轻松地对名称上的列表进行排序，但我需要一些不同的东西。该列表有重复项，我想先按名称排序，然后按活动或非活动排序。然后，我想要标记不活动的重复项，以便我可以删除它们。

现有代码跨多个类，但这里是jist（如果excel单元格为null，则fixNullValues（）只返回一个空字符串）：

for (int i = 2; i <= xlRange.Rows.Count; i++)
{
            firm = new Firm();
            string begCell;
            begCell = "B" + i;
            excelCell = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.get_Range(begCell, begCell);
            firm.acctNo = fixNullValues(Convert.ToString(excelCell.Value2));

            begCell = "C" + i;
            excelCell = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.get_Range(begCell, begCell);
            firm.name = fixNullValues(Convert.ToString(excelCell.Value2));

            begCell = "D" + i;
            excelCell = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.get_Range(begCell, begCell);
            firm.addy1 = fixNullValues(Convert.ToString(excelCell.Value2));

            begCell = "E" + i;
            excelCell = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.get_Range(begCell, begCell);
            firm.city = fixNullValues(Convert.ToString(excelCell.Value2));

            begCell = "AB" + i;
            excelCell = (Microsoft.Office.Interop.Excel.Range)excelWorksheet.get_Range(begCell, begCell);
            if (Convert.ToString(excelCell.Value2).Equals("Active", StringComparison.OrdinalIgnoreCase))
                firm.active = true;

            firmList.Add(firm);

Answer 1

见下面的代码：

class Firm : IComparable<Firm>, IComparable
{
    string acctNo;
    string name;
    string addy1;
    string city;
    bool active;

    int completeness
    {
        get
        {
            return accNo.Length + name.Length + addy1.Length + city.Length;
        }
    }

    public int CompareTo(Firm other)
    {
        var c = name.CompareTo(other.name);
        if (c != 0)
            return c;
        c = active.CompareTo(other.active);
        if (c != 0)
            return c;
        return completeness.CompareTo(other.completeness);
    }

    public int CompareTo(object other)
    {
        return CompareTo((Firm)other);
    }

    public static IEnumerable<Firm> sortFirms(IEnumerable<Firm> firms)
    {
        return firms.GroupBy(f => f.name).Select(g => g.OrderByDescending().First());
    }
}

Answer 2

var yourNewListWithoutDeleting = firmList.GroupBy(x => x.name)
                                         .SelectMany(x => 
                                             x.OrderByDescending(y => y.active)
                                             .Take(1)
                                         );

c #.NET LinQ - 排序对象列表的子集

2 个答案: