Linq to SQL Group by and Sum in Select

I need to convert that SQL Query into Linq:

SELECT SUM([ArticleAmount]) as amount ,[ArticleName] FROM [DB].[dbo].[OrderedArticle] group by articlename order by amount desc 

I tried the following code but I get an error at "a.ArticleName" that says a definition of "ArticleName" would be missing.

var sells = orderedArt .GroupBy(a => a.ArticleName) .Select(a => new {Amount = a.Sum(b => b.ArticleAmount),Name=a.ArticleName}) .OrderByDescending(a=>a.Amount) .ToList(); 

Has someone of you and idea how to fix this?

Thanks for your help!

1 Answer

You are getting this error because the Grouping doesn't return IEnumerable<OrderedArticle> but IEnumerable<IGrouping<string, OrderedArticle>>

You need to change your code to use a.Key:

var sells = orderedArt .GroupBy(a => a.ArticleName) .Select(a => new { Amount = a.Sum(b => b.ArticleAmount), Name = a.Key}) .OrderByDescending(a => a.Amount) .ToList();