How to create Excel file using OpenXML without creating a local file?

How to create Excel file using OpenXML without creating a local file?

You can create an Excel file using OpenXML without creating a local file by writing the Excel file to a MemoryStream instead of a local file.

Here's an example of how to create an Excel file using OpenXML and write it to a MemoryStream in C#:

// Create a new MemoryStream using (MemoryStream stream = new MemoryStream()) { // Create a new Excel document in the MemoryStream using (SpreadsheetDocument document = SpreadsheetDocument.Create(stream, SpreadsheetDocumentType.Workbook)) { // Add a WorkbookPart to the document WorkbookPart workbookPart = document.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); // Add a WorksheetPart to the WorkbookPart WorksheetPart worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(new SheetData()); // Add a Sheets object to the Workbook Sheets sheets = document.WorkbookPart.Workbook.AppendChild(new Sheets()); // Add a Sheet to the Sheets object Sheet sheet = new Sheet() { Id = document.WorkbookPart.GetIdOfPart(worksheetPart), SheetId = 1, Name = "Sheet1" }; sheets.Append(sheet); // Save the changes to the document workbookPart.Workbook.Save(); } // Do something with the Excel document in the MemoryStream, like sending it as an email attachment or uploading it to a web server // For example, you could send the Excel document as an email attachment using the System.Net.Mail.SmtpClient class: using (SmtpClient client = new SmtpClient("smtp.example.com")) { MailMessage message = new MailMessage(); message.To.Add("user@example.com"); message.Subject = "Excel Document"; message.Body = "Attached is the Excel document."; message.Attachments.Add(new Attachment(stream, "document.xlsx", "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")); client.Send(message); } }

In this example, we create a new MemoryStream and use it to create a new Excel document using OpenXML. We add a WorkbookPart to the document, along with a WorksheetPart and a Sheet.

We then save the changes to the document and do something with the Excel document in the MemoryStream. In this example, we send the Excel document as an email attachment using the SmtpClient class.

By writing the Excel file to a MemoryStream, you can create an Excel file using OpenXML without creating a local file.

Examples

  1. "C# OpenXML create Excel file in memory"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); // Add sheets, rows, cells, etc. as needed workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Demonstrates creating an Excel file in memory using OpenXML without saving to a local file.

  2. "C# OpenXML create Excel sheet in memory"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); // Add rows, cells, etc. to the worksheet as needed workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Illustrates creating an Excel sheet in memory using OpenXML without saving to a local file.

  3. "C# OpenXML create Excel cell in memory"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); var sheetData = worksheetPart.Worksheet.AppendChild(new SheetData()); var row = new Row(); var cell = new Cell { CellValue = new CellValue("Hello, World!"), DataType = CellValues.String }; row.AppendChild(cell); sheetData.AppendChild(row); workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Shows creating an Excel cell with a value in memory using OpenXML without saving to a local file.

  4. "C# OpenXML create Excel file without saving to disk"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); // Add sheets, rows, cells, etc. as needed workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Demonstrates creating an Excel file in memory using OpenXML without saving to a local file.

  5. "C# OpenXML create Excel sheet without saving to disk"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); // Add rows, cells, etc. to the worksheet as needed workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Illustrates creating an Excel sheet in memory using OpenXML without saving to a local file.

  6. "C# OpenXML create Excel cell without saving to disk"

    • Code:
      using DocumentFormat.OpenXml.Packaging; using DocumentFormat.OpenXml.Spreadsheet; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); var sheetData = worksheetPart.Worksheet.AppendChild(new SheetData()); var row = new Row(); var cell = new Cell { CellValue = new CellValue("Hello, World!"), DataType = CellValues.String }; row.AppendChild(cell); sheetData.AppendChild(row); workbookPart.Workbook.Save(); } // Use the memoryStream as needed (e.g., return as a response) }
    • Description: Shows creating an Excel cell with a value in memory using OpenXML without saving to a local file.

  7. "C# OpenXML create Excel file in memory and return as byte array"

    • Code:
      byte[] excelBytes; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); // Add sheets, rows, cells, etc. as needed workbookPart.Workbook.Save(); } excelBytes = memoryStream.ToArray(); } // Use excelBytes as needed (e.g., return as a response)
    • Description: Creates an Excel file in memory using OpenXML and returns it as a byte array.

  8. "C# OpenXML create Excel sheet in memory and return as byte array"

    • Code:
      byte[] excelBytes; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); // Add rows, cells, etc. to the worksheet as needed workbookPart.Workbook.Save(); } excelBytes = memoryStream.ToArray(); } // Use excelBytes as needed (e.g., return as a response)
    • Description: Creates an Excel sheet in memory using OpenXML and returns it as a byte array.

  9. "C# OpenXML create Excel cell in memory and return as byte array"

    • Code:
      byte[] excelBytes; using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); var worksheetPart = workbookPart.AddNewPart<WorksheetPart>(); worksheetPart.Worksheet = new Worksheet(); var sheetData = worksheetPart.Worksheet.AppendChild(new SheetData()); var row = new Row(); var cell = new Cell { CellValue = new CellValue("Hello, World!"), DataType = CellValues.String }; row.AppendChild(cell); sheetData.AppendChild(row); workbookPart.Workbook.Save(); } excelBytes = memoryStream.ToArray(); } // Use excelBytes as needed (e.g., return as a response)
    • Description: Creates an Excel cell with a value in memory using OpenXML and returns it as a byte array.

  10. "C# OpenXML create Excel file in memory and download as response"

    • Code:
      using (var memoryStream = new MemoryStream()) { using (var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook)) { var workbookPart = spreadsheetDocument.AddWorkbookPart(); workbookPart.Workbook = new Workbook(); // Add sheets, rows, cells, etc. as needed workbookPart.Workbook.Save(); } memoryStream.Position = 0; return File(memoryStream.ToArray(), "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet", "output.xlsx"); }
    • Description: Creates an Excel file in memory using OpenXML and returns it as a downloadable response.

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