SQL到LINQ：使用GROUP BY，连接，其中具有数

Question

我有这样的SQL：

select p.ProductID, count(pa.Value) as condition 
from ProductBE as p 
join ProductAttributeBE as pa 
on p.ProductID = pa.ProductID 
where ProductCategoryID = 1203 
and (Value = 'PassingerCar' or Value = '15') 
group by p.ProductID 

ProductBE是一个更具有ProductAttributeBE 什么想接缝是这样的：

var query1 = from p in this.DataBase.ProductBEs 
      join a in this.DataBase.ProductAttributeBEs 
      on p.ProductID equals a.ProductID 
      where p.ProductCategoryID == 1203 && (a.Value == radius ||     a.Value == carType) 
      group p by p.ProductID into grp 
      select new { grp.Key, Condition = grp.Count(x => x.Value != null) }; 

此代码不编译 有问题，或者选择不同的表/ allias分组

Answer 1

试试这个：

var query1 = from p in this.DataBase.ProductBEs 
      join a in this.DataBase.ProductAttributeBEs 
      on p.ProductID equals a.ProductID 
      where p.ProductCategoryID == 1203 && (a.Value == radius || a.Value == carType) 
      select new {p.ProductID, a.Value} into t 
      group t by t.ProductID into grp 
      select new { grp.Key, Condition = grp.Count(x => x.Value != null) };