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

4 examples in Named styles and themes

Registered named style

EnableNamedStyles

Registers a style by name on the writer, then applies it to a whole row. The name appears in Excel's cell styles gallery, so a reader can reuse it after the file is generated.

Write.cs

using FormulaEngineer.Api;
using FormulaEngineer.Api.Styling;

var stylingOptions =
    new ExcelStylingOptions
    {
        EnableNamedStyles = true
    };

using (var writer = new ExcelStyledWriter("registered-named-style-report.xlsx", null, stylingOptions))
{
    var headerNamedStyle =
        writer.RegisterNamedStyle(
            ExcelNamedStyle.Create(
                "ReportHeader",
                ExcelStyle.Default.With(
                    font: ExcelFontStyle.Default.With(
                        bold: true,
                        color: ExcelColor.FromRgb(255, 255, 255)),
                    fill: ExcelFillStyle.Solid(
                        ExcelColor.FromRgb(31, 78, 121)))));

    using (var sheet = writer.CreateWorksheet("Named Style"))
    {
        sheet.WriteRowWithNamedStyle(
            new object?[] { "Region", "Revenue", "Status" },
            headerNamedStyle);

        sheet.WriteRow("North", 125000, "Ready");
        sheet.WriteRow("South", 98000, "Review");
    }

    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.

Get FormulaEngineer on NuGet Contact for styling questions