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

Bold total row with currency format

Closes a table with a filled, bold, right-aligned total row carrying a live SUM formula — showing that a styled cell and a formula cell are the same thing.

Write.cs

using FormulaEngineer.Api;
using FormulaEngineer.Api.Styling;
using FormulaEngineer.Licensing;

var headerStyle =
		ExcelStyle.Default.With(
				font: ExcelFontStyle.Default.With(
						bold: true,
						color: ExcelColor.FromRgb(255, 255, 255)),
				fill: ExcelFillStyle.Solid(
						ExcelColor.FromRgb(31, 78, 121)),
				alignment: ExcelAlignmentStyle.Default.With(
						horizontal: ExcelHorizontalAlignment.Center));

var currencyStyle =
		ExcelStyle.Default.With(
				numberFormat: ExcelNumberFormatStyle.Custom("$#,##0.00"));

var totalStyle =
		ExcelStyle.Default.With(
				font: ExcelFontStyle.Default.With(
						bold: true,
						color: ExcelColor.FromRgb(255, 255, 255)),
				fill: ExcelFillStyle.Solid(
						ExcelColor.FromRgb(0, 112, 192)),
				numberFormat: ExcelNumberFormatStyle.Custom("$#,##0.00"),
				alignment: ExcelAlignmentStyle.Default.With(
						horizontal: ExcelHorizontalAlignment.Right));

using (var writer = new ExcelStyledWriter("bold-total-row.xlsx"))
{
	using (var sheet = writer.CreateWorksheet("Totals"))
	{
		sheet.WriteRow(
				new object?[] { "Department", "Amount" },
				headerStyle);

		sheet.WriteRow(
				new object?[] { "Engineering", 12500m },
				new ExcelStyle?[] { null, currencyStyle });

		sheet.WriteRow(
				new object?[] { "Operations", 8700m },
				new ExcelStyle?[] { null, currencyStyle });

		sheet.WriteRow(
				new object?[] { "TOTAL", ExcelFormula.From("SUM(B2:B3)") },
				new ExcelStyle?[] { totalStyle, totalStyle });
	}

	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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