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);
}

Number format
Pro

Set currency format ( $2,612.11 ) 

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

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

Custom format
Pro

Set date format ( 21/Aug/2023 10:51:18 ) 

var style = new Style
{
    NumberFormat = NumberFormat.Custom("dd/mmm/yyyy hh:mm:ss")
};

var dateToExport = new DateTime(2023, 08, 21, 10, 51, 18);
using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", style))
{
    ew.Write($"{dateToExport.ToOADate()}", 1, 2, 1, 1, DataType.Number);
}

Custom format
Pro

Set shares format ( 1,357.5712 ) 

var style = new Style
{
    FontSize = FontSize.Font11,
    NumberFormat = NumberFormat.Custom("#,##0.0000")
};

using (var ew = new ExcelWriter("C:\\temp\\test.xlsx", style))
{
    ew.Write("1357.5712", 1, 2, 1, 1, DataType.Number);
}

Freeze configuration
Pro

Pin rows or columns to the top when scrolling 

var sheet = new Sheet
{
    Name = "Monthly Report", 
    FreezeType = FreezeType.Row,
    FreezeCount = 1
};

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

Rows Height
Pro

Set custom rows height 

var sheet = new Sheet
{
    RowsHeight = new List<double?> { 0, null, 35 }
};

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

Performance

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

# Library Execution Time Memory Usage
1 SwiftExcel 6.1 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

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