Question

我有这个问题：

    var rowsPerProvider = (from row in dt.Select()
        let emp = row["f_name"].ToString().Trim()
        group row by emp
        into g
        select g).ToDictionary(
            g => g.Key,
            g => g.ToArray());

如何更新它以过滤更多列？例如，目前它在f_name上。如何将其更新为f_name和m_name以及l_name上的群组？

Answer 1

使用匿名类：

// (...)
    group row by new { emp, something }

Answer 2

创建一个包含您要分组的字段的匿名对象：

var rowsPerProvider = (from row in dt.Select()
    group row by new
    {
        emp1 = row["f_name"].ToString().Trim(),
        emp2 = row["m_name"].ToString().Trim(),
        emp3 = row["l_name"].ToString().Trim(),
    }
    into g
    select g).ToDictionary(
        g => g.Key,
        g => g.ToArray());

按语句向组添加更多项目

2 个答案: