[英]how to sum a column in entity framework
I am trying to sum a column and get details member wise 我正在尝试总结一个列并明智地获取详细信息
My table data is 我的表数据是
id membername cost
1 a 100
2 aa 100
3 a 100
4 aa 0
5 b 100
In Entity Framework I try to sum cost column and get result like this 在实体框架中,我尝试对成本列求和并得到这样的结果
membername totalcost
a 200
aa 100
b 100
then I am doing this 然后我这样做
var result = from o in db.pruchasemasters.Where(d => d.memberid == d.membertable.id && d.entrydate >= thisMonthStart && d.entrydate <= thisMonthEnd)
group o by new { o.membertable.members } into purchasegroup
select new
{
membername = purchasegroup.Key,
total = purchasegroup.Sum(s => s.price)
};
How do I read the results and is my code right or not? 如何阅读结果并且我的代码是否合适?
Something like that will work 这样的东西会起作用
var result = db.pruchasemasters.GroupBy(o => o.membername)
.Select(g => new { membername = g.Key, total = g.Sum(i => i.cost) });
foreach (var group in result)
{
Console.WriteLine("Membername = {0} Totalcost={1}", group.membername, group.total);
}
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