C#: Expand/Collapse Rows and Columns in Excel

In Excel, you can group related rows and columns to better organize and manage data. This feature is especially useful for simplifying complex spreadsheets, making data easier to navigate and analyze. When data is grouped, Excel provides the option to expand or collapse the groups, allowing users to control how much information is displayed at any given time. In this article, you will learn how to expand or collapse rows and columns in Excel in C# using Spire.XLS for .NET.

• Expand Rows and Columns in Excel in C#
• Collapse Rows and Columns in Excel in C#

Install Spire.XLS for .NET

To begin with, you need to add the DLL files included in the Spire.XLS for .NET package as references in your .NET project. The DLL files can be either downloaded from this link or installed via NuGet.

PM> Install-Package Spire.XLS

Expand Rows and Columns in Excel in C#

Expanding a group reveals all the detailed data within it. Using Spire.XLS for .NET, you can expand the grouped columns or rows through the Worksheet.Range[].ExpandGroup() method. The following are the detailed steps:

• Create a Workbook instance.
• Load an Excel file using Workbook.LoadFromFile() method.
• Get a specified worksheet using Workbook.Worksheets[] property.
• Expand the grouped rows using Worksheet.Range[].ExpandGroup(GroupByType.ByRows) method.
• Expand the grouped columns using Worksheet.Range[].ExpandGroup(GroupByType.ByColumns) method.
• Save the result file using Workbook.SaveToFile() method.

using Spire.Xls;
namespace ExpandandExcelGroups
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create Workbook instance
            Workbook workbook = new Workbook();

            // Load an Excel file
            workbook.LoadFromFile("Grouped.xlsx");

            // Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            // Expand the grouped rows
            sheet.Range["A2:G6"].ExpandGroup(GroupByType.ByRows, ExpandCollapseFlags.ExpandParent);
            sheet.Range["A8:G13"].ExpandGroup(GroupByType.ByRows);

            // Expand the grouped columns
            sheet.Range["D2:G13"].ExpandGroup(GroupByType.ByColumns);

            // Save the result file
            workbook.SaveToFile("ExpandGroups.xlsx");
        }
    }
}

Collapse Rows and Columns in Excel in C#

Collapsing a group hides the information, showing only the summary or parent data. To collapse rows or columns in Excel, you can use the Worksheet.Range[].CollapseGroup() method. The following are the detailed steps:

• Create a Workbook instance.
• Load an Excel file using Workbook.LoadFromFile() method.
• Get a specified worksheet using Workbook.Worksheets[] property.
• Collapse the rows using Worksheet.Range[].CollapseGroup(GroupByType.ByRows) method.
• Collapse the columns using Worksheet.Range[].CollapseGroup(GroupByType.ByColumns) method.
• Save the result file using Workbook.SaveToFile() method.

using Spire.Xls;
namespace CollapseExcelGroups
{
    class Program
    {
        static void Main(string[] args)
        {
            // Create Workbook instance
            Workbook workbook = new Workbook();

            // Load an Excel file
            workbook.LoadFromFile("ExpandGroups.xlsx");

            // Get the first worksheet
            Worksheet sheet = workbook.Worksheets[0];

            // Collapse rows
            sheet.Range["A2:A6"].CollapseGroup(GroupByType.ByRows);

            // Collapse Columns
            sheet.Range["D1:G1"].CollapseGroup(GroupByType.ByColumns);

            // Save the result file
            workbook.SaveToFile("CollapseGroups.xlsx");
        }
    }
}

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