LINQ group by date - include empty days WITHOUT using join

Question

Using C#, NHibernate, NHibernate to LINQ. Using NHibernate to LINQ, I do not have the JOIN functionality. I can not use QueryOver either.

I have a LINQ query that co

Answer 1

You can Union() the data from your query with dummy items that you create in memory. For example:

var query4 = query3.ToList(); // Prevent multiple execution.

var startDate = DateTime.Today.AddDays(-99);

var emptyData = Enumerable.Range(1,100).Select (i => 
    new ReferrerChart
        {
           Date = startDate.AddDays(i),
           LeadsCount = 0,
           SalesCount = 0
        });

var result = query4 .Union(
             emptyData
                .Where(e => !query4.Select(x => x.Date).Contains(e.Date)))
             .OrderBy(x => x.Date);