c# - 获取 linq 返回 IEnumerable<DataRow> 结果

Question

如何将以下 SQL 查询转换为 C# 中的 LINQ？

我不需要两个表中的所有列，结果集应该是

IEnumerable<DataRow>

查询:

select 
    c.level, cl.name, c.quantity
from 
    dbo.vw_categories c
left join 
    dbo.vw_categoriesLocalization cl on c.level = cl.level 
                                     and cl.language = 'en'
where 
    c.level like '000%' 
    and c.level <> '000';

预期:

IEnumerable<DataRow> result = ????

提前致谢..

Answer 1

以下是编写查询的方法:

var query =
    from c in db.vw_categories
    join cl in db.vw_categoriesLocalization on c.level equals cl.level into clo
    from cl in clo.DefaultIfEmpty()
    where (cl == null || cl.language == "en")
          && c.level.StartsWith("000")
          && c.level != "000"
    select new
    {
        c.level,
        name = cl == null ? null : cl.name,
        c.quantity
    }

将其转换为 IEnumerable<DataRow>也许你可以做这样的事情:

var datarows = query.Select(r => {
    var row = dataTable.NewRow();
    row["level"] = r.level;
    row["name"] = r.name;
    row["quantity"] = r.quantity;
    return row;
});