LINQ Group By Subtotal & Total - linq

Question

I have a Batch with BatchItems entered by multiple users. I'm trying to not only get the subtotal per user for a single batch, but also grand total for that same batch regardless of the user grouping. Its this last part that I can't figure out. How might I get that total in order to return it as a list?
from b in context.BatchItem
where b.BatchId == batchId
group b by b.CreatedByUser into g
select new
{
BatchName = g.FirstOrDefault<BatchItem>().Batch.Name,
User = g.Key,
UserBatchCount = g.Count<BatchItem>(),
// something like this is what I can't figure out
TotalBatchCount = b.Count<BatchItem>()
}

Answer 1

Not sure, but try this:
from b in context.BatchItem
let cnt = context.BatchItem.Count()
b.BatchId == batchId
group b by b.CreatedByUser into g
select new
{
BatchName = g.FirstOrDefault<BatchItem>().Batch.Name,
User = g.Key,
UserBatchCount = g.Count<BatchItem>(),
// something like this is what I can't figure out
TotalBatchCount = cnt
}

Answer 2

var batch1 = new { Name = "Batch A", BatchId = 1, CreatedByUser = "David" };
var batch2 = new { Name = "Batch A", BatchId = 1, CreatedByUser = "Mike" };
var batch3 = new { Name = "Batch B", BatchId = 2, CreatedByUser = "Cathy" };
var batch4 = new { Name = "Batch B", BatchId = 2, CreatedByUser = "Cathy" };
var batch5 = new { Name = "Batch B", BatchId = 2, CreatedByUser = "David" };
var batch6 = new { Name = "Batch C", BatchId = 3, CreatedByUser = "Henry" };
var batchItem = new[] { batch1, batch2, batch3, batch4, batch5, batch6 }.ToList();
var result =
batchItem.Where(b => b.BatchId == batchId)
.GroupBy(b => b.BatchId, b => b)
.SelectMany(g =>
g.GroupBy(c => c.CreatedByUser, c => c)
.SelectMany(sg =>
sg.Select(c => new
{
BatchName = g.First().Name,
UserName = c.CreatedByUser,
UserBatchCount = sg.Count(),
TotalBatchCount = g.Count()
})
)
);
Audit Log: Removed previous two code blocks.