Description

A NuGet library that you can add into your project and will extend your IEnumerable of objects.

Usage

It's like using any pivot table in spreadsheets. You can set properties as rows, columns and as values to be computed.

var expenses = new List<Expenses>()
	{
		new Expenses { Category = "Food", Date = new DateTime(2018, 01, 1), Amount = 100 },
		new Expenses { Category = "Food", Date = new DateTime(2018, 01, 2), Amount = 12 },
		new Expenses { Category = "Travel", Date = new DateTime(2018, 01, 3), Amount = 55 },
		new Expenses { Category = "Travel", Date = new DateTime(2018, 03, 4), Amount = 101 },
		new Expenses { Category = "Toiletries", Date = new DateTime(2018, 03, 6), Amount = 67 },
		new Expenses { Category = "Car", Date = new DateTime(2018, 04, 22), Amount = 796 },
		new Expenses { Category = "Food", Date = new DateTime(2018, 05, 13), Amount = 9 },
		new Expenses { Category = "Toiletries", Date = new DateTime(2018, 05, 14), Amount = 32 },
		new Expenses { Category = "Food", Date = new DateTime(2018, 06, 3), Amount = 345 },
		new Expenses { Category = "Car", Date = new DateTime(2018, 06, 7), Amount = 8 }
	};

var pivotTable = expenses
	.GetPivotTableBuilder(l => l.Sum(e => e.Amount))
	.SetRow(e => e.Category)
	.SetColumn(e => e.Date)
	.Build();

Compute Multiple Fields

var pivotTable = expenses
	.GetPivotTableBuilder(l => new {
		SumOfAmount = l.Sum(e => e.Amount),
		AverageOfAmount = l.Average(e => e.Amount)
	})
	.SetRow(e => e.Category)
	.SetColumn(e => e.Date)
	.Build();