FormulaEngineer examples

Create, read, and style Excel workbooks in .NET.

Style workbooks as you write them — fonts, fills, borders, number formats, alignment, and layout — using ExcelStyledWriter. Every example below is a complete, runnable snippet.

Group

Cells and text 10 Layout 10 Conditional formatting 6 Named styles and themes 4 Tables and notes 10 Images and shapes 4 Charts and sparklines 6 Dashboards 4

Example

10 examples in Cells and text

Centred title with merged cells

Merges four cells into a single banner and centres a 16pt title both horizontally and vertically inside it, then writes a normal header row underneath.

Write.cs

using FormulaEngineer.Api;
using FormulaEngineer.Api.Styling;
using FormulaEngineer.Licensing;

var titleStyle =
		ExcelStyle.Default.With(
				font: ExcelFontStyle.Default.With(
						bold: true,
						size: 16d,
						color: ExcelColor.FromRgb(255, 255, 255)),
				fill: ExcelFillStyle.Solid(
						ExcelColor.FromRgb(0, 112, 160)),
				alignment: ExcelAlignmentStyle.Default.With(
						horizontal: ExcelHorizontalAlignment.Center,
						vertical: ExcelVerticalAlignment.Center));

var headerStyle =
		ExcelStyle.Default.With(
				font: ExcelFontStyle.Bold,
				alignment: ExcelAlignmentStyle.Default.With(
						horizontal: ExcelHorizontalAlignment.Center));

using (var writer = new ExcelStyledWriter("merged-title-report.xlsx"))
{
	using (var sheet = writer.CreateWorksheet("Summary"))
	{
		sheet.MergeCells(1, 1, 1, 4);

		sheet.WriteRow(
				new object?[] { "Monthly Sales Summary" },
				titleStyle);

		sheet.WriteRow();

		sheet.WriteRow(
				new object?[] { "Month", "North", "South", "Total" },
				headerStyle);

		sheet.WriteRow("Jan", 12000, 9800, 21800);
		sheet.WriteRow("Feb", 13500, 10200, 23700);
	}

	writer.Close();
}

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Style your own workbooks

Styling is part of the same package — no separate install, no Excel, no COM automation.

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