Question

I’m puzzled. I copied this code from the Microsoft LINQ examples site, but can’t get it to compile.

I want to do something similar, but it says it cannot resolve symbol minPrice, and a bunch of other errors. What gives?

public void Linq84() {     List products = GetProductList();     var categories =        from p in products        group p by p.Category into g        from minPrice = g.Group.Min(p => p.UnitPrice)        select new {Category = g.Key, CheapestProducts = g.Group.Where(p => p.UnitPrice == minPrice)};     ObjectDumper.Write(categories, 1);  }  

Answer 1

I think that the query has some typos, or was made in the early stages of Linq.

I’ll rewrite it as this:

var categories = from p in products                  group p by p.Category into g                    let  minPrice = g.Min(p => p.UnitPrice)                  select new {                               Category = g.Key,                               CheapestProducts = g.Where(p => p.UnitPrice == minPrice)                             }; 

BTW, as good learning resources I highly recommend you LinqPad which is a great tool and HookedToLinq.