Question

I need compute some join operations on my data, on the result of these operations I need to use a WHERE statement.

At the moment I use this syntax below, no errors, but result is not as expected.
For sure I need Group the result for my join and apply a query on it.

Could you please provide me an example of code? Unfortunately I’m pretty new at Linq and I’m not able to do it.

var myImagesForUser = from i in context.CmsImagesContents
                      join c in context.CmsContents on i.ContentId equals c.ContentId
                      join a in context.CmsAuthors on c.AuthorId equals a.AuthorId
                      join u in context.aspnet_Users on a.UserId equals u.UserId
                      where u.UserId == (Guid)myLoggedInUser.ProviderUserKey
                      select i;

Answer 1

Probably related data for current logged in user is not present in any one or more tables (Authors, Contents, ImagesContents) and you are not getting any result due to inner join on these tables. you can try outer join instead. Look at this article for left outer join in Linq queries