Linq Select with Max/Min, Left Join - linq

Question

I am trying to convert my program from ADO to Entity Framework and Linq. Can someone show me how to write this using Linq?
SELECT a.[Category], [WorkOrderVersion], min(a.[CategoryStartDate]) AS CategoryStartDate,
max(a.[CategoryEndDate]) AS CategoryEndDate, c.[HexColor] AS CustomBackgroundColor
FROM [Job].[EstimateTbl] as a
Left JOIN [Employee].[EmployeeColorPrefsTbl] c
ON c.[Item] = a.[Category] AND c.[EmployeeID] = #employeeID
Where [ID_Job] = #ID_Job
group by [Category], [WorkOrderVersion], c.[HexColor]
ORDER BY [Category]
I am close, but I'm not getting the grouping and Max/Min part...
var query = from a in db.EstimateTbls
where a.ID_Job == objActiveJobClass.ID
join c in db.EmployeeColorPrefsTbls on a.Category equals c.Item into ps
from c in ps.DefaultIfEmpty()
orderby a.Category ascending
select new
{
a.Category,
a.WorkOrderDate,
CategoryStartDate = a.CategoryStartDate,
CategoryEndDate = a.CategoryEndDate,
c.HexColor,
};

Answer 1

var query = (from a in db.EstimateTbls.Where(x=>x.ID_Job==objActiveJobClass.ID)
join c in db.EmployeeColorPrefsTbls.Where(x=>x.EmployeeID==#employeeID)
on a.Category equals c.Item
into ps1
from ps in ps1.DefaultIfEmpty()
select new{a,ps}).ToList()
.GroupBy(x=>new{x.a.Category,x.a.WorkOrderVersion,HexColor=x.ps?.HexColor})
.Select(x=>new
{
Category=x.Key.Category,
WorkOrderVersion=x.Select(z=>z.a.WorkOrderVersion).FirstOrDefault(),
CategoryStartDate=x.Min(z=>z.a.CategoryStartDate),
CategoryEndDate=x.Max(z=>z.a.CategoryEndDate),
CustomBackgroundColor=x.Key.HexColor
})
.OrderBy(x=>x.Category)
.ToList();

Answer 2

var query = from a in db.EstimateTbls
where a.ID_Job == objActiveJobClass.ID
join c in db.EmployeeColorPrefsTbls on a.Category equals c.Item
group new { a, c} by new { a.Category, a.WorkOrderVersion, a.CategoryStartDate, a.CategoryEndDate, c.HexColor } into g
orderby g.Key.Category ascending, g.Key.WorkOrderVersion
select new
{
Count = g.Count(),
g.Key.Category,
g.Key.WorkOrderVersion,
g.Key.CategoryStartDate,
g.Key.CategoryEndDate,
CustomBackgroundColor = g.Key.HexColor,
};
APP.1 (2) 7/26/2018 12:00:00 AM, 7/31/2018 12:00:00 AM, #FFFFA500
CAB.1 (6) , , #FF00FF00
CLN.1 (126) , , #FF7FFFD4
DMO.1 (5) 8/1/2018 12:00:00 AM, 8/5/2018 12:00:00 AM, #FFFF0000
DMO.2 (1) 8/5/2018 12:00:00 AM, 8/10/2018 12:00:00 AM, #FFFF0000