Create, read, and edit Excel files in ASP.NET Core

Syncfusion Excel library for ASP.NET Core platform can be used to create, read, edit Excel files. This also convert Excel files to PDF.

Create a simple Excel report

The below steps illustrates creating a simple Invoice formatted Excel document in ASP.NET Core.

Step 1: Create a new C# ASP.NET Core Web Application project.

Create ASP.NET Core web application in Visual Studio

Step 2: Select Web Application pattern (Model-View-Controller) for the project.

Select Web application pattern

Step 3: Install the Syncfusion.XlsIO.Net.Core NuGet package as reference to your .NET Standard applications from NuGet.org.

Add XlsIO reference to the project

Step 4: A default controller with named HomeController.cs gets added on creation of ASP.NET Core project. Include the following namespaces in the HomeController.cs file.
using Syncfusion.XlsIO;
using System.IO;
using Syncfusion.Drawing;
Imports Syncfusion.XlsIO
Imports System.IO
Imports Syncfusion.Drawing
Step 5: A default action method named Index will be present in HomeController.cs. Right click on Index method and select Go To View where you will be directed to its associated view page Index.cshtml.
Step 6: Add a new button in the Index.cshtml as shown below.
@{Html.BeginForm("CreateDocument", "Home", FormMethod.Get);
    {
        <div>
            <input type="submit" value="Create Document" style="width:150px;height:27px" />
        </div>
    }
    Html.EndForm();
}
Step 7: Add a new action method CreateDocument in HomeController.cs and include the below code snippet to create an Excel file and download it.
//Create an instance of ExcelEngine
using (ExcelEngine excelEngine = new ExcelEngine())
{
	IApplication application = excelEngine.Excel;

	application.DefaultVersion = ExcelVersion.Excel2016;

	//Create a workbook
	IWorkbook workbook = application.Workbooks.Create(1);
	IWorksheet worksheet = workbook.Worksheets[0];

	//Adding a picture
	FileStream imageStream = new FileStream("AdventureCycles-Logo.png", FileMode.Open, FileAccess.Read);
	IPictureShape shape = worksheet.Pictures.AddPicture(1, 1, imageStream);

	//Disable gridlines in the worksheet
	worksheet.IsGridLinesVisible = false;

	//Enter values to the cells from A3 to A5
	worksheet.Range["A3"].Text = "46036 Michigan Ave";
	worksheet.Range["A4"].Text = "Canton, USA";
	worksheet.Range["A5"].Text = "Phone: +1 231-231-2310";

	//Make the text bold
	worksheet.Range["A3:A5"].CellStyle.Font.Bold = true;

	//Merge cells
	worksheet.Range["D1:E1"].Merge();

	//Enter text to the cell D1 and apply formatting.
	worksheet.Range["D1"].Text = "INVOICE";
	worksheet.Range["D1"].CellStyle.Font.Bold = true;
	worksheet.Range["D1"].CellStyle.Font.RGBColor = Color.FromArgb(42, 118, 189);
	worksheet.Range["D1"].CellStyle.Font.Size = 35;

	//Apply alignment in the cell D1
	worksheet.Range["D1"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight;
	worksheet.Range["D1"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;

	//Enter values to the cells from D5 to E8
	worksheet.Range["D5"].Text = "INVOICE#";
	worksheet.Range["E5"].Text = "DATE";
	worksheet.Range["D6"].Number = 1028;
	worksheet.Range["E6"].Value = "12/31/2018";
	worksheet.Range["D7"].Text = "CUSTOMER ID";
	worksheet.Range["E7"].Text = "TERMS";
	worksheet.Range["D8"].Number = 564;
	worksheet.Range["E8"].Text = "Due Upon Receipt";

	//Apply RGB backcolor to the cells from D5 to E8
	worksheet.Range["D5:E5"].CellStyle.Color = Color.FromArgb(42, 118, 189);
	worksheet.Range["D7:E7"].CellStyle.Color = Color.FromArgb(42, 118, 189);

	//Apply known colors to the text in cells D5 to E8
	worksheet.Range["D5:E5"].CellStyle.Font.Color = ExcelKnownColors.White;
	worksheet.Range["D7:E7"].CellStyle.Font.Color = ExcelKnownColors.White;

	//Make the text as bold from D5 to E8
	worksheet.Range["D5:E8"].CellStyle.Font.Bold = true;

	//Apply alignment to the cells from D5 to E8
	worksheet.Range["D5:E8"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
	worksheet.Range["D5:E5"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
	worksheet.Range["D7:E7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;
	worksheet.Range["D6:E6"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop;

	//Enter value and applying formatting in the cell A7
	worksheet.Range["A7"].Text = "  BILL TO";
	worksheet.Range["A7"].CellStyle.Color = Color.FromArgb(42, 118, 189);
	worksheet.Range["A7"].CellStyle.Font.Bold = true;
	worksheet.Range["A7"].CellStyle.Font.Color = ExcelKnownColors.White;

	//Apply alignment
	worksheet.Range["A7"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
	worksheet.Range["A7"].CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter;

	//Enter values in the cells A8 to A12
	worksheet.Range["A8"].Text = "Steyn";
	worksheet.Range["A9"].Text = "Great Lakes Food Market";
	worksheet.Range["A10"].Text = "20 Whitehall Rd";
	worksheet.Range["A11"].Text = "North Muskegon,USA";
	worksheet.Range["A12"].Text = "+1 231-654-0000";

	//Create a Hyperlink for e-mail in the cell A13
	IHyperLink hyperlink = worksheet.HyperLinks.Add(worksheet.Range["A13"]);
	hyperlink.Type = ExcelHyperLinkType.Url;
	hyperlink.Address = "Steyn@greatlakes.com";
	hyperlink.ScreenTip = "Send Mail";

	//Merge column A and B from row 15 to 22
	worksheet.Range["A15:B15"].Merge();
	worksheet.Range["A16:B16"].Merge();
	worksheet.Range["A17:B17"].Merge();
	worksheet.Range["A18:B18"].Merge();
	worksheet.Range["A19:B19"].Merge();
	worksheet.Range["A20:B20"].Merge();
	worksheet.Range["A21:B21"].Merge();
	worksheet.Range["A22:B22"].Merge();

	//Enter details of products and prices
	worksheet.Range["A15"].Text = "  DESCRIPTION";
	worksheet.Range["C15"].Text = "QTY";
	worksheet.Range["D15"].Text = "UNIT PRICE";
	worksheet.Range["E15"].Text = "AMOUNT";
	worksheet.Range["A16"].Text = "Cabrales Cheese";
	worksheet.Range["A17"].Text = "Chocos";
	worksheet.Range["A18"].Text = "Pasta";
	worksheet.Range["A19"].Text = "Cereals";
	worksheet.Range["A20"].Text = "Ice Cream";
	worksheet.Range["C16"].Number = 3;
	worksheet.Range["C17"].Number = 2;
	worksheet.Range["C18"].Number = 1;
	worksheet.Range["C19"].Number = 4;
	worksheet.Range["C20"].Number = 3;
	worksheet.Range["D16"].Number = 21;
	worksheet.Range["D17"].Number = 54;
	worksheet.Range["D18"].Number = 10;
	worksheet.Range["D19"].Number = 20;
	worksheet.Range["D20"].Number = 30;
	worksheet.Range["D23"].Text = "Total";

	//Apply number format
	worksheet.Range["D16:E22"].NumberFormat = "$.00";
	worksheet.Range["E23"].NumberFormat = "$.00";

	//Apply incremental formula for column Amount by multiplying Qty and UnitPrice
	application.EnableIncrementalFormula = true;
	worksheet.Range["E16:E20"].Formula = "=C16*D16";

	//Formula for Sum the total
	worksheet.Range["E23"].Formula = "=SUM(E16:E22)";

	//Apply borders
	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Grey_25_percent;
	worksheet.Range["A16:E22"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Grey_25_percent;
	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].LineStyle = ExcelLineStyle.Thin;
	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].LineStyle = ExcelLineStyle.Thin;
	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeTop].Color = ExcelKnownColors.Black;
	worksheet.Range["A23:E23"].CellStyle.Borders[ExcelBordersIndex.EdgeBottom].Color = ExcelKnownColors.Black;

	//Apply font setting for cells with product details
	worksheet.Range["A3:E23"].CellStyle.Font.FontName = "Arial";
	worksheet.Range["A3:E23"].CellStyle.Font.Size = 10;
	worksheet.Range["A15:E15"].CellStyle.Font.Color = ExcelKnownColors.White;
	worksheet.Range["A15:E15"].CellStyle.Font.Bold = true;
	worksheet.Range["D23:E23"].CellStyle.Font.Bold = true;

	//Apply cell color
	worksheet.Range["A15:E15"].CellStyle.Color = Color.FromArgb(42, 118, 189);

	//Apply alignment to cells with product details
	worksheet.Range["A15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft;
	worksheet.Range["C15:C22"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;
	worksheet.Range["D15:E15"].CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter;

	//Apply row height and column width to look good
	worksheet.Range["A1"].ColumnWidth = 36;
	worksheet.Range["B1"].ColumnWidth = 11;
	worksheet.Range["C1"].ColumnWidth = 8;
	worksheet.Range["D1:E1"].ColumnWidth = 18;
	worksheet.Range["A1"].RowHeight = 47;
	worksheet.Range["A2"].RowHeight = 15;
	worksheet.Range["A3:A4"].RowHeight = 15;
	worksheet.Range["A5"].RowHeight = 18;
	worksheet.Range["A6"].RowHeight = 29;
	worksheet.Range["A7"].RowHeight = 18;
	worksheet.Range["A8"].RowHeight = 15;
	worksheet.Range["A9:A14"].RowHeight = 15;
	worksheet.Range["A15:A23"].RowHeight = 18;
	
	
	//Saving the Excel to the MemoryStream 
	MemoryStream stream = new MemoryStream();

	workbook.SaveAs(stream);

	//Set the position as '0'.
	stream.Position = 0;

	//Download the Excel file in the browser
	FileStreamResult fileStreamResult = new FileStreamResult(stream, "application/excel");

	fileStreamResult.FileDownloadName = "Output.xlsx";

	return fileStreamResult;
}
'Create an instance of ExcelEngine
Using excelEngine As ExcelEngine = New ExcelEngine()

	Dim application As IApplication = excelEngine.Excel

	application.DefaultVersion = ExcelVersion.Excel2016

	'Create a workbook
	Dim workbook As IWorkbook = application.Workbooks.Create(1)
	Dim worksheet As IWorksheet = workbook.Worksheets(0)

	'Adding a picture
	Dim imageStream As FileStream = New FileStream("AdventureCycles-Logo.png", FileMode.Open, FileAccess.Read)
	Dim shape As IPictureShape = worksheet.Pictures.AddPicture(1, 1, imageStream)

	'Disable gridlines in the worksheet
	worksheet.IsGridLinesVisible = False

	'Enter values to the cells from A3 to A5
	worksheet.Range("A3").Text = "46036 Michigan Ave"
	worksheet.Range("A4").Text = "Canton, USA"
	worksheet.Range("A5").Text = "Phone: +1 231-231-2310"

	'Make the text bold
	worksheet.Range("A3:A5").CellStyle.Font.Bold = True

	'Merge cells
	worksheet.Range("D1:E1").Merge()

	'Enter text to the cell D1 and apply formatting.
	worksheet.Range("D1").Text = "INVOICE"
	worksheet.Range("D1").CellStyle.Font.Bold = True
	worksheet.Range("D1").CellStyle.Font.RGBColor = Color.FromArgb(42, 118, 189)
	worksheet.Range("D1").CellStyle.Font.Size = 35

	'Apply alignment in the cell D1
	worksheet.Range("D1").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignRight
	worksheet.Range("D1").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop

	'Enter values to the cells from D5 to E8
	worksheet.Range("D5").Text = "INVOICE#"
	worksheet.Range("E5").Text = "DATE"
	worksheet.Range("D6").Number = 1028
	worksheet.Range("E6").Value = "12/31/2018"
	worksheet.Range("D7").Text = "CUSTOMER ID"
	worksheet.Range("E7").Text = "TERMS"
	worksheet.Range("D8").Number = 564
	worksheet.Range("E8").Text = "Due Upon Receipt"

	'Apply RGB back color to the cells from D5 to E8
	worksheet.Range("D5:E5").CellStyle.Color = Color.FromArgb(42, 118, 189)
	worksheet.Range("D7:E7").CellStyle.Color = Color.FromArgb(42, 118, 189)

	'Apply known colors to the text in cells D5 to E8
	worksheet.Range("D5:E5").CellStyle.Font.Color = ExcelKnownColors.White
	worksheet.Range("D7:E7").CellStyle.Font.Color = ExcelKnownColors.White

	'Make the text as bold from D5 to E8
	worksheet.Range("D5:E8").CellStyle.Font.Bold = True

	'Apply alignment to the cells from D5 to E8
	worksheet.Range("D5:E8").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
	worksheet.Range("D5:E5").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
	worksheet.Range("D7:E7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter
	worksheet.Range("D6:E6").CellStyle.VerticalAlignment = ExcelVAlign.VAlignTop

	'Enter value and applying formatting in the cell A7
	worksheet.Range("A7").Text = "  BILL TO"
	worksheet.Range("A7").CellStyle.Color = Color.FromArgb(42, 118, 189)
	worksheet.Range("A7").CellStyle.Font.Bold = True
	worksheet.Range("A7").CellStyle.Font.Color = ExcelKnownColors.White

	'Apply alignment
	worksheet.Range("A7").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
	worksheet.Range("A7").CellStyle.VerticalAlignment = ExcelVAlign.VAlignCenter

	'Enter values in the cells A8 to A12
	worksheet.Range("A8").Text = "Steyn"
	worksheet.Range("A9").Text = "Great Lakes Food Market"
	worksheet.Range("A10").Text = "20 Whitehall Rd"
	worksheet.Range("A11").Text = "North Muskegon,USA"
	worksheet.Range("A12").Text = "+1 231-654-0000"

	'Create a Hyperlink for e-mail in the cell A13
	Dim hyperlink As IHyperLink = worksheet.HyperLinks.Add(worksheet.Range("A13"))
	hyperlink.Type = ExcelHyperLinkType.Url
	hyperlink.Address = "Steyn@greatlakes.com"
	hyperlink.ScreenTip = "Send Mail"

	'Merge column A and B from row 15 to 22
	worksheet.Range("A15:B15").Merge()
	worksheet.Range("A16:B16").Merge()
	worksheet.Range("A17:B17").Merge()
	worksheet.Range("A18:B18").Merge()
	worksheet.Range("A19:B19").Merge()
	worksheet.Range("A20:B20").Merge()
	worksheet.Range("A21:B21").Merge()
	worksheet.Range("A22:B22").Merge()

	'Enter details of products and prices
	worksheet.Range("A15").Text = "  DESCRIPTION"
	worksheet.Range("C15").Text = "QTY"
	worksheet.Range("D15").Text = "UNIT PRICE"
	worksheet.Range("E15").Text = "AMOUNT"
	worksheet.Range("A16").Text = "Cabrales Cheese"
	worksheet.Range("A17").Text = "Chocos"
	worksheet.Range("A18").Text = "Pasta"
	worksheet.Range("A19").Text = "Cereals"
	worksheet.Range("A20").Text = "Ice Cream"
	worksheet.Range("C16").Number = 3
	worksheet.Range("C17").Number = 2
	worksheet.Range("C18").Number = 1
	worksheet.Range("C19").Number = 4
	worksheet.Range("C20").Number = 3
	worksheet.Range("D16").Number = 21
	worksheet.Range("D17").Number = 54
	worksheet.Range("D18").Number = 10
	worksheet.Range("D19").Number = 20
	worksheet.Range("D20").Number = 30
	worksheet.Range("D23").Text = "Total"

	'Apply number format
	worksheet.Range("D16:E22").NumberFormat = "$.00"
	worksheet.Range("E23").NumberFormat = "$.00"

	'Apply incremental formula for column Amount by multiplying Qty and UnitPrice
	application.EnableIncrementalFormula = True
	worksheet.Range("E16:E20").Formula = "=C16*D16"

	'Formula for Sum the total
	worksheet.Range("E23").Formula = "=SUM(E16:E22)"

	'Apply borders
	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Grey_25_percent
	worksheet.Range("A16:E22").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Grey_25_percent
	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).LineStyle = ExcelLineStyle.Thin
	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).LineStyle = ExcelLineStyle.Thin
	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeTop).Color = ExcelKnownColors.Black
	worksheet.Range("A23:E23").CellStyle.Borders(ExcelBordersIndex.EdgeBottom).Color = ExcelKnownColors.Black

	'Apply font setting for cells with product details
	worksheet.Range("A3:E23").CellStyle.Font.FontName = "Arial"
	worksheet.Range("A3:E23").CellStyle.Font.Size = 10
	worksheet.Range("A15:E15").CellStyle.Font.Color = ExcelKnownColors.White
	worksheet.Range("A15:E15").CellStyle.Font.Bold = True
	worksheet.Range("D23:E23").CellStyle.Font.Bold = True

	'Apply cell color
	worksheet.Range("A15:E15").CellStyle.Color = Color.FromArgb(42, 118, 189)

	'Apply alignment to cells with product details
	worksheet.Range("A15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignLeft
	worksheet.Range("C15:C22").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter
	worksheet.Range("D15:E15").CellStyle.HorizontalAlignment = ExcelHAlign.HAlignCenter

	'Apply row height and column width to look good
	worksheet.Range("A1").ColumnWidth = 36
	worksheet.Range("B1").ColumnWidth = 11
	worksheet.Range("C1").ColumnWidth = 8
	worksheet.Range("D1:E1").ColumnWidth = 18
	worksheet.Range("A1").RowHeight = 47
	worksheet.Range("A2").RowHeight = 15
	worksheet.Range("A3:A4").RowHeight = 15
	worksheet.Range("A5").RowHeight = 18
	worksheet.Range("A6").RowHeight = 29
	worksheet.Range("A7").RowHeight = 18
	worksheet.Range("A8").RowHeight = 15
	worksheet.Range("A9:A14").RowHeight = 15
	worksheet.Range("A15:A23").RowHeight = 18

	'Saving the Excel to the MemoryStream 			
	Dim stream As MemoryStream = New MemoryStream()
	workbook.SaveAs(stream)

	'Set the position as '0'.
	stream.Position = 0

	'Download the Excel file in the browser
	Dim fileStreamResult As FileStreamResult = New FileStreamResult(stream, "application/excel")
	fileStreamResult.FileDownloadName = "Output.xlsx"
	Return fileStreamResult
End Using

A complete working example of how to create an Excel file in ASP.NET Core can be downloaded from Create-Excel-file.zip.

By executing the program, you will get the Excel file as below.
Output File

NOTE

Starting with v16.2.0.x, if you reference Syncfusion assemblies from trial setup or from the NuGet feed, you also have to add “Syncfusion.Licensing” assembly reference and include a license key in your projects. Please refer to this link to know about registering Syncfusion license key in your applications to use our components.

Read and Edit Excel file

The below code snippet illustrates how to read and edit an Excel file in ASP.NET Core.

//New instance of ExcelEngine is created 
//Equivalent to launching Microsoft Excel with no workbooks open
//Instantiate the spreadsheet creation engine
ExcelEngine excelEngine = new ExcelEngine();

//Instantiate the Excel application object
IApplication application = excelEngine.Excel;

//Assigns default application version
application.DefaultVersion = ExcelVersion.Excel2013;

//A existing workbook is opened.              
string basePath = _hostingEnvironment.WebRootPath + @"\XlsIO\Sample.xlsx";              
FileStream sampleFile = new FileStream(basePath, FileMode.Open);

IWorkbook workbook = application.Workbooks.Open(sampleFile);

//Access first worksheet from the workbook.
IWorksheet worksheet = workbook.Worksheets[0];   

//Set Text in cell A3.
sheet.Range["A3"].Text ="Hello World";          

//Defining the ContentType for excel file.
string ContentType = "Application/msexcel";

//Define the file name.
string fileName = "Output.xlsx";

//Creating stream object.
MemoryStream stream = new MemoryStream();

//Saving the workbook to stream in XLSX format
workbook.SaveAs(stream);

stream.Position = 0;

//Closing the workbook.
workbook.Close();

//Dispose the Excel engine
excelEngine.Dispose();

//Creates a FileContentResult object by using the file contents, content type, and file name.
return File(stream, ContentType, fileName);

NOTE

_hostingEnvironment is the base path for input files of type IHostingEnvironment.