C# 如何获得类似于此tsql查询的lambda查询？

具有T-SQL查询：

select [ProductNumber] ,max([ProductRevNumber])
from Products  
group by [ProductNumber]

尝试的LINQ查询：

ProductsDBContext.Products.GroupBy(x => x.ProductRevNumber)
                          .Select(group => ProductNumber, 
                                           ProductRevNumber = group.Max(x => x.ProductRevNumber));

---

lambda查询不起作用。

我想这就是您想要的：

var latestProducts = ProductsDBContext.Products
    .GroupBy(p => p.ProductNumber).Select(g => new 
    {
        ProductNumber = g.Key,
        MaxProductRevNumber = g.Max(p => p.ProductRevNumber))
    });

---

g键代表什么？它是一个特殊的关键字还是某种排序？g.Key是您分组的字段的值（即p.ProductNumber）。

from p in db.Products
group p by p.ProductNumber into g
select new
{
    ProductNumber = g.Key,
    ProductRevNumber = g.Max(p => p.ProductRevNumber)
};