Merge pull request #590 from telerik/new-kb-grouping-data-using-radspreadprocessing-08eafa73d02a47098ab6e869fbc66668

Added new kb article grouping-data-using-radspreadprocessing

Author: dessyordanova

knowledge-base/grouping-data-using-radspreadprocessing.md

@@ -0,0 +1,180 @@
+---
+title: Grouping Data Example Using RadSpreadProcessing
+description: Learn how to group data in a worksheet using RadSpreadProcessing for Document Processing.
+type: how-to
+page_title: How to Group Data in RadSpreadProcessing
+meta_title: How to Group Data in RadSpreadProcessing
+slug: grouping-data-using-radspreadprocessing
+tags: document, processing, group, column, excel, spread
+res_type: kb
+ticketid: 1692310
+---
+
+<style>
+img[alt$="><"] {
+  border: 1px solid lightgrey;
+}
+</style>
+
+## Environment
+
+| Version | Product | Author | 
+| ---- | ---- | ---- | 
+| 2025.2.520| RadSpreadProcessing |[Desislava Yordanova](https://www.telerik.com/blogs/author/desislava-yordanova)| 
+
+## Description
+
+This article shows how to generate a worksheet with **grouped** data from a **flat** collection of records as an input. 
+
+>caption Flat vs. Grouped Data
+
+![Flat vs Grouped Data in Excel ><](images/build-grouped-data-in-spreadprocessing.png)   
+
+## Solution
+
+Note that the grouping should be performed separately beforehand, and only then can the Worksheet be populated with the grouped data.
+
+Once you have the grouped data, the SpreadProcessing functionality (in a similar way to MS Excel) allows you to assign the outline level to all rows that belong to the same group. 
+To make it clear and simple, let's take the following example - a flat list of products stored in CSV data:
+
+### Preparing Grouped Data
+
+1. Group your flat data (e.g. Northwind.Products) before populating the worksheet.
+2. Use LINQ or other methods to group rows based on a specific column (e.g. CategoryID).
+
+Use the following code snippet to group rows in a worksheet:
+
+```csharp
+    internal class Program
+    {
+        static void Main(string[] args)
+        {
+            string fileName = "sample.csv";
+            Workbook workbook;
+          
+            CsvFormatProvider csv_formatProvider = new CsvFormatProvider();
+
+            using (Stream input = new FileStream(fileName, FileMode.Open))
+            {
+                workbook = csv_formatProvider.Import(input, TimeSpan.FromSeconds(10));
+
+            }
+            Worksheet worksheet = workbook.ActiveWorksheet;
+
+            // Convert worksheet data to DataTable
+            DataTable dataTable = WorksheetToDataTable(worksheet);
+
+            // Apply grouping and outlining
+           Workbook groupedWorkbook= ApplyGroupingToWorksheet(dataTable, new Workbook());
+
+            Telerik.Windows.Documents.Spreadsheet.FormatProviders.IWorkbookFormatProvider xlsx_formatProvider = 
+                new Telerik.Windows.Documents.Spreadsheet.FormatProviders.OpenXml.Xlsx.XlsxFormatProvider();
+         
+            string outputFilePath = "output.xlsx";
+            File.Delete(outputFilePath);
+            using (Stream output = new FileStream(outputFilePath, FileMode.Create))
+            {
+                xlsx_formatProvider.Export(workbook, output, TimeSpan.FromSeconds(10));
+            }
+
+            Process.Start(new ProcessStartInfo() { FileName = outputFilePath, UseShellExecute = true });
+
+            outputFilePath = "groupedOutput.xlsx";
+            File.Delete(outputFilePath);
+            using (Stream output = new FileStream(outputFilePath, FileMode.Create))
+            {
+                xlsx_formatProvider.Export(groupedWorkbook, output, TimeSpan.FromSeconds(10));
+            }
+
+            Process.Start(new ProcessStartInfo() { FileName = outputFilePath, UseShellExecute = true });
+        }
+        static DataTable WorksheetToDataTable(Worksheet worksheet)
+        {
+            DataTable dataTable = new DataTable();
+
+            // Get used range
+            CellRange usedRange = worksheet.UsedCellRange;
+
+            // Add columns to DataTable (assuming first row contains headers)
+            for (int col = 0; col < usedRange.ColumnCount; col++)
+            {
+                string columnName = worksheet.Cells[0, col].GetValue().Value.RawValue.ToString();
+                dataTable.Columns.Add(columnName ?? $"Column{col}");
+            }
+
+            // Add data rows
+            for (int row = 1; row < usedRange.RowCount; row++)
+            {
+                DataRow dataRow = dataTable.NewRow();
+                for (int col = 0; col < usedRange.ColumnCount; col++)
+                {
+                    dataRow[col] = worksheet.Cells[row, col].GetValue().Value.RawValue ?? string.Empty;
+                }
+                dataTable.Rows.Add(dataRow);
+            }
+
+            return dataTable;
+        }
+
+        static Workbook ApplyGroupingToWorksheet(DataTable dataTable, Workbook workbook)
+        {
+            // Group the data by the sixth column (index 5)
+            var groupedResults = from p in dataTable.AsEnumerable()
+                          group p by p.Field<string>("categoryID") into g
+                          select new
+                          {
+                              categoryID = g.Key,
+                              productID = string.Join(";", from i in g select i.Field<string>("productID")),
+                              productName = string.Join(";", from i in g select i.Field<string>("productName")),
+                              quantityPerUnit = string.Join(";", from i in g select i.Field<string>("quantityPerUnit")),
+                              CustomunitPriceerLastname = string.Join(";", from i in g select i.Field<string>("unitPrice")),
+                              unitsInStock = string.Join(";", from i in g select i.Field<string>("unitsInStock")),
+                              unitsOnOrder = string.Join(";", from i in g select i.Field<string>("unitsOnOrder"))
+                          };
+
+
+            workbook.Worksheets.Add();
+            Worksheet worksheet = workbook.ActiveWorksheet;
+            worksheet.Cells[0, 1].SetValue("productID");
+            worksheet.Cells[0, 2].SetValue("productName");
+            worksheet.Cells[0, 3].SetValue("quantityPerUnit");
+            worksheet.Cells[0, 4].SetValue("unitPrice");
+            // Header is row 0, data starts at row 1
+            int currentRow = 1;
+
+            // Process each group
+            foreach (var group in groupedResults)
+            {
+                worksheet.Cells[currentRow, 1].SetValue("CategoryID "+group.categoryID);
+                currentRow++;
+
+                string[] productsIDs= group.productID.Split(';');
+                string[] productNames = group.productName.Split(';');
+                string[] quantityPerUnits = group.quantityPerUnit.Split(';');
+                string[] unitPrices = group.CustomunitPriceerLastname.Split(';');
+                string[] unitsInStocks = group.unitsInStock.Split(';');
+                string[] unitsOnOrders = group.unitsOnOrder.Split(';');
+
+                int start = currentRow;
+                int end= currentRow+ productsIDs.Length - 1;
+                for (int i = 0; i < productsIDs.Length; i++)
+                {
+                    worksheet.Cells[currentRow, 1].SetValue(productsIDs[i]);
+                    worksheet.Cells[currentRow, 2].SetValue(productNames[i]);
+                    worksheet.Cells[currentRow, 3].SetValue(quantityPerUnits[i]);
+                    worksheet.Cells[currentRow, 4].SetValue(unitPrices[i]);
+                    worksheet.Cells[currentRow, 5].SetValue(unitsInStocks[i]);
+                    worksheet.Cells[currentRow, 6].SetValue(unitsOnOrders[i]);
+                    currentRow++;
+                }
+                worksheet.Rows[start, end].Group();
+            }
+            return workbook;
+        }
+    }
+```
+Modify the example to suit your specific data structure and requirements.
+
+## See Also
+
+- [Grouping in SpreadProcessing]({%slug radspreadprocessing-features-grouping%})

knowledge-base/images/build-grouped-data-in-spreadprocessing.png

@@ -189,4 +189,5 @@ Both properties have a default value of true. The following snippet shows how to
 
 * [Filtering]({%slug radspreadprocessing-features-filtering%})
 * [Sorting]({%slug radspreadprocessing-features-sorting%})
+* [Grouping Data Example Using RadSpreadProcessing]({%slug grouping-data-using-radspreadprocessing%})