public IActionResult Index()
{
//This is the average via simple average lambda
double averageGrade = GradeList.Average(x => x.NumberGrade);
//Simple Group by into anonymous type for aggregate
var groupedGrades = GradeList
.GroupBy(x => x.LetterGrade)
.Select(g => new
{
g.Key,
Count = g.Count()
})
.ToList()
.OrderBy(o => o.Key);
var aggregateGrades = new Dictionary <string, int>();
foreach (var g in groupedGrades)
{
aggregateGrades.Add(g.Key, g.Count);
}
ViewBag.AverageGrade = averageGrade;
ViewBag.GroupList = aggregateGrades;
return(View(GradeList));
}