Question

        var query1 = from l in context.Logs
                    where l.LogID == maxid
                    select l;
        int count1 = query1.Count();

        var query2 = from ld in context.LogDetails
                     where ld.LogID == maxid
                     select ld;
        int count2 = query2.Count();

        Assert.AreEqual(1,count1);
        Assert.AreEqual(0,count2);

I wish I could write the above query in a better way. If I were using TSQL, I could use OUTER JOIN and filter to see if ld.LogID was null. But I do not know how to do that in LINQ. Is there any way I could clean this up?

Thanks for helping out.

Answer 1

Outer joins are possible in LINQ.

var query = from log in context.Logs
            join logDetail in context.LogDetails
                on log.LogID = logDetail.LogID into lj
            from item in lj.DefaultIfEmpty()
            select new { log.LogID, MissingDetails = lj == null };