在使用Group By子句重构LINQ语句时需要帮助吗？

Question

The Linq-To-SQL that needs refactoring is found below:

   var query = from p in Cache.Model.Products
               join sc in Cache.Model.ShishaCombinations on p.ProductID equals sc.ProductID
               where sc.NumberOfMixes ==  mixes
               select new { p.ProductID, p.Name };

with the following one-liner:

   group by p.ProductID

I know that group by omits any need for the select clause so both can live together in the same LINQ-To-SQL statement so can someone help me refactor the above please?

To help me remove any repeating data in my results. <-- This is the entire point in this question. A product is repeated a number of times based on the number of Flavours that are used by the product. So as a result in the 'ShishaCombinations' table one ProductID may be repeated many times one for each flavour that it uses. I would like to group the results returned from the query above or call distinct on it as I don't want add the product 'n' times to my GUI because it appears 'n' number of times in my results. Hopefully that will clear up any confusion of what I am trying to do.

Answer 1

The code below is all what I needed:

        var query1 = (from p in Cache.Model.Products
                     join sc in Cache.Model.ShishaCombinations on p.ProductID equals sc.ProductID
                     where sc.NumberOfMixes == mixes
                     select new { p.ProductID, p.Name }).Distinct();

Ufuk, thanks for answering mate. I knew my answer was a simple one lol : )

Answer 2

You can use into keyword after select clause. You cannot just group by because you are projecting an anonymous type.

   var query = from p in Cache.Model.Products
               join sc in Cache.Model.ShishaCombinations on p.ProductID equals sc.ProductID
               where sc.NumberOfMixes ==  mixes
               select new { p.ProductID, p.Name } into productInfo
               group productInfo by productInfo.productId;