Simple initialization

Fill excel document with test data 100 rows x 10 columns

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx"))
{
    for (var row = 1; row <= 100; row++)
    {
        for (var col = 1; col <= 10; col++)
        {
            ew.Write($"row:{row}-col:{col}", col, row);
        }
    }
}

Sheet configuration

Set custom sheet name and define columns width

var sheet = new Sheet
{
    Name = "Monthly Report", 
    ColumnsWidth = new List<double> { 10, 12, 8, 8, 35 }
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", sheet))
{
    ew.Write("data", 1, 1);
}

Using formulas

Output 20 rows and calculate average and sum values

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx"))
{
    for (var row = 1; row <= 20; row++)
    {
        ew.Write(row.ToString(), 1, row, DataType.Number);
    }

    ew.WriteFormula(FormulaType.Average, 1, 22, 1, 1, 20);
    ew.WriteFormula(FormulaType.Sum, 1, 23, 1, 1, 20);
}

Custom formulas
Pro

Output 20 rows and apply custom formulas on them

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx"))
{
    for (var row = 1; row <= 20; row++)
    {
        ew.Write(row.ToString(), 1, row, 1, 0, DataType.Number);
    }

    ew.Write("A20/A10", 1, 22, 1, 0, DataType.CustomFormula);
    ew.Write("SUM(A1:A20)-A22", 1, 23, 1, 0, DataType.CustomFormula);
}

Multiple sheets
Pro

Create additional sheets with individual configuration

var sheets = new List<Sheet>
{
    new Sheet { Name = "Summary" },
    new Sheet { Name = "Details" }
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", sheets))
{
    ew.Write("value for the 1st sheet", 1, 1, 1);
    ew.Write("value for the 2nd sheet", 1, 1, 2);
}

Merging & Filtering
Pro

Merge and filter cells supplying range parameters

var sheet = new Sheet
{
    Name = "Monthly Report",
    MergeRanges = new List<MergeRange>
    {
        new MergeRange(2, 3, 5), new MergeRange(3, 2, 7)
    },
    FilterRange = new FilterRange(1, 1, 5)
};

var ew = new ExcelWriter("C:\\temp\\test.xlsx", sheet);

Styling fonts
Pro

Set custom font styles and cell alignment

var style = new Style
{
    FontColor = Color.Black,
    FontName = FontName.TimesNewRoman,
    FontSize = FontSize.Font16,
    FontStyleBold = true,
    FontStyleItalic = true,
    FontStyleUnderline = true,
    AlignHorizontal = AlignHorizontal.Left,
    AlignVertical = AlignVertical.Center
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", style))
{
    ew.Write("font with decoration", 1, 2, 1, 1);
}

Styling borders
Pro

Set custom border styles and cell fill color

var styles = new List<Style>
{
    new Style
    {
        BorderLeft = true, BorderRight = true,
        BorderTop = true, BorderBottom = true,
        BorderColor = Color.Black,
    },
    new Style { FillColor = Color.Grey }
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", styles))
{
    ew.Write("borders", 2, 2, 1, 1);
    ew.Write("fill color", 3, 3, 1, 2);
}

Number format
Pro

Set percentage format ( 38.51% )

var style = new Style
{
    FontSize = FontSize.Font11,
    NumberFormat = NumberFormat.Percentage
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", style))
{
    ew.Write("0.3851", 1, 2, 1, 1, DataType.Number);
}

Custom format
Pro

Set custom currency format ( $2,612.11 )

var style = new Style
{
    FontSize = FontSize.Font11,
    NumberFormat = NumberFormat.Custom("$#,##0.00")
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", style))
{
    ew.Write("2612.11", 1, 2, 1, 1, DataType.Number);
}

Performance

SwiftExcel has incredible performance due to ignoring XML serialization and streaming data directly to the file. Below is performance test creating document with 100 000 rows and 100 columns comparing to other popular Excel output libraries on Nuget.

# Library Execution Time Memory Usage
1 SwiftExcel 14.2 sec 19 mb
2 FastExcel 31.1 sec 3200 mb
3 EPPlus 44.2 sec 2900 mb
4 Syncfusion.XlsIO 73.3 sec 2700 mb
5 IronXL.Excel 306.8 sec 7700 mb
6 Microsoft Interop Excel >3 hours 27 mb

Plans & Pricing

SwiftExcel is free. Yes, that is right, the fastest Excel output library is completely free even for commercial use. Subscription on SwiftExcel.Pro allows you to use advanced enterprise features that are not part of free SwiftExcel package.

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