Linq查询汇总按列排序
本文关键字:排序 查询 Linq | 更新日期: 2023-09-27 18:09:36
场景是这样的
public class Test {
public string name;
public int val1;
public int val1;
}
name |val 1 |val 2|
'aa' | 10 | 4 |
'aa' | 30 | 5 |
'bb' | 14 | 4 |
'bb' | 16 | 6 |
'cc' | 5 | 5 |
'cc' | 2 | 1 |
'cc' | 1 | 1 |
按名称分组并获得每个名称的汇总val_1和val_2的最佳方法是什么
name |val 1 |val 2|
'aa' | 40 | 9 |
'bb' | 30 | 10 |
'cc' | 8 | 7 |
试试这个
var results =
from t in db.Tests
group t by t.name into g
orderby g.Key
select new
{
name = g.Key,
val_1 = g.Sum(x => x.val_1),
val_2 = g.Sum(x => x.val_2)
};
或者如果你喜欢流畅的语法:
var results = db.Tests.GroupBy(t => t.name)
.OrderBy(g => g.Key)
.Select(g => new
{
name = g.Key,
val_1 = g.Sum(x => x.val_1),
val_2 = g.Sum(x => x.val_2)
});