如何将此转换为使用Linq到数据集？

Question

如何将此转换为使用Linq到数据集？

foreach (Row row in Rows) 
{ 
    if (row.material> 0) 
        sumtid += row.time * row.material; 
    else 
        sumtid += row.time; 
} 

Answer 1

var sumtid = Rows.Sum(x => x.time * (x.materials > 0 ? x.materials : 1));

要么

var sumtid = Rows.Sum(x => x.materials > 0 ? x.time * row.materials : x.time);

我假设你的Rows变量是IEnumerable<Row>.

编辑

解决问题的另一种方法:

var sumtid = Rows.Select(x => x.materials > 0 ? x.time * row.materials : x.time)
                 .Sum();