linq-to-sql – Linq To SQL Group By和Sum

她是一张显示我所拥有的桌子的图片,b我需要显示的网格.

opps无法发布图片.我试着解释一下.我的桌子有四个柱子.

>项目编号(String)
> ItemNumber(String)
>位置(字符串)
>数量.(真实的).

我的网格需要看起来像这样.

> ProjectNumber
> ItemNumber
> QtyMain.
>数量其他.

我需要写一个linq查询分组evry line所以我将se 1行pr项目/ ItemNumber组合求和数量为2个不同的列1显示到qty其中location是main,1表示qty where location不是(！=)main. linq可以为我做这个,或者怎么办？

解决方法

public class Foo
{
    public Int32 ProjectNumber;
    public String ItemNumber;
    public String InventLocation;
    public Int32 Qty;
}

void Main()
{
    List<Foo> foos = new List<Foo>(new[]{
        new Foo { ProjectNumber = 1,ItemNumber = "a",InventLocation = "Main",Qty = 3 },new Foo { ProjectNumber = 1,InventLocation = "Sub",Qty = 2 },Qty = 1 },InventLocation = "Sub2",Qty = 5 }
    });

    var foo = from f in foos
              group f by new { f.ProjectNumber,f.ItemNumber } into fGroup
              select new {
                ProjectNumber = fGroup.Key.ProjectNumber,ItemNumber = fGroup.Key.ItemNumber,QtyMain = fGroup.Where (g => g.InventLocation == "Main").Sum (g => g.Qty),Rest = fGroup.Where (g => g.InventLocation != "Main").Sum (g => g.Qty)
              };
    foo.Dump();
}

导致：

IEnumerable<> (1 item)  
ProjectNumber ItemNumber QtyMain Rest 
1             a          6       8