OLAP library that implements:

• in-memory multidimensional dataset (PivotData class)
• OLAP operations: roll-up, slice and dice (SliceQuery class)
• pivot table data model with efficient totals/sub-totals calculation (PivotTable class)

Official component page: PivotData Toolkit for .NET

• Getting Started
• Aggregate Functions
• Implement custom aggregator
• Query/Filter the cube
• Sort pivot table data by labels or values
• Create HTML pivot table
• Pivot a DataTable
• Create Excel PivotTable
• API Reference

• CsvDemo: how to aggregate data from CSV file
• DynamicFormulaMeasure: how to define formula-based measure dynamically (with a user-entered string expression)
• DynamicListGrouping: group objects by multiple fields and calculate aggregates
• ExcelPivotTable: generates Excel PivotTable by PivotData's PivotTable
• ParallelCube: how to perform parallel aggregation (use all CPU cores) and merge all results into one resulting cube
• PivotTableMvc: MVC example that renders simple pivot table / charts (without PivotData Toolkit components)
• QueryCube: how to make OLAP queries with SliceQuery class: slice, dice, filter, roll-up, calculate derived dimensions and measures

NReco.PivotData is in production use at SeekTable.com and PivotData microservice. NReco.PivotData is a pre-requisite for PivotData Toolkit components.

Copyright 2015-2026 Vitaliy Fedorchenko

Distributed under the MIT license (see src/LICENSE). Note that NReco.PivotData.Extensions remains closed source and requires a commercial license to use (can be purchased here).