How to read open excel file at C#

How to read open excel file at C#

To read an open Excel file in C#, you can use the Microsoft.Office.Interop.Excel library, which allows you to interact with Excel files through COM interop. Before using this library, ensure that you have Microsoft Excel installed on your machine.

Here's an example of how to read an open Excel file:

using System; using Microsoft.Office.Interop.Excel; public class Program { public static void Main() { Application excelApp = null; Workbook workbook = null; try { // Connect to the running Excel application excelApp = (Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application"); // Get the active workbook workbook = excelApp.ActiveWorkbook; // Read data from the active worksheet Worksheet worksheet = workbook.ActiveSheet; // Get data from cells Range range = worksheet.UsedRange; object[,] values = (object[,])range.Value; // Display the data int rowCount = values.GetLength(0); int colCount = values.GetLength(1); for (int row = 1; row <= rowCount; row++) { for (int col = 1; col <= colCount; col++) { Console.Write(values[row, col] + "\t"); } Console.WriteLine(); } } catch (Exception ex) { Console.WriteLine("Error: " + ex.Message); } finally { // Release the COM objects if (workbook != null) System.Runtime.InteropServices.Marshal.ReleaseComObject(workbook); if (excelApp != null) System.Runtime.InteropServices.Marshal.ReleaseComObject(excelApp); } } }

In this example, we use System.Runtime.InteropServices.Marshal.GetActiveObject to connect to the running Excel application. We then get the active workbook and read data from the active worksheet using the UsedRange property. The data is stored in a 2-dimensional array, and we display it on the console.

Make sure to release the COM objects using System.Runtime.InteropServices.Marshal.ReleaseComObject to free up resources after you are done with them.

Examples

  1. "Read data from an open Excel file using Microsoft.Office.Interop.Excel"

    • Description: This query involves using the Microsoft.Office.Interop.Excel library to read data from an open Excel file.
    // Code Implementation using Excel = Microsoft.Office.Interop.Excel; Excel.Application excelApp = (Excel.Application)System.Runtime.InteropServices.Marshal.GetActiveObject("Excel.Application"); Excel.Workbook workbook = excelApp.ActiveWorkbook; Excel.Worksheet worksheet = (Excel.Worksheet)workbook.Sheets[1]; string cellValue = worksheet.Cells[1, 1].Value;

  2. "Read data from an open Excel file using ExcelDataReader"

    • Description: This query involves using the ExcelDataReader library to read data from an open Excel file.
    // Code Implementation using ExcelDataReader; IExcelDataReader excelReader = ExcelReaderFactory.CreateReader(File.Open("path/to/your/open/excel/file.xlsx", FileMode.Open)); while (excelReader.Read()) { string cellValue = excelReader.GetString(0); // Adjust index based on your Excel structure }

  3. "Read data from an open Excel file using ClosedXML"

    • Description: This query involves using the ClosedXML library to read data from an open Excel file.
    // Code Implementation using ClosedXML.Excel; XLWorkbook workbook = new XLWorkbook("path/to/your/open/excel/file.xlsx"); IXLWorksheet worksheet = workbook.Worksheet(1); string cellValue = worksheet.Cell(1, 1).GetString();

  4. "Read data from an open Excel file using EPPlus"

    • Description: This query involves using the EPPlus library to read data from an open Excel file.
    // Code Implementation using OfficeOpenXml; using (ExcelPackage package = new ExcelPackage(new FileInfo("path/to/your/open/excel/file.xlsx"))) { ExcelWorksheet worksheet = package.Workbook.Worksheets[0]; string cellValue = worksheet.Cells[1, 1].Text; }

  5. "Read data from an open Excel file using NPOI"

    • Description: This query involves using the NPOI library to read data from an open Excel file.
    // Code Implementation using NPOI.SS.UserModel; using NPOI.XSSF.UserModel; XSSFWorkbook workbook; using (FileStream file = new FileStream("path/to/your/open/excel/file.xlsx", FileMode.Open, FileAccess.Read)) { workbook = new XSSFWorkbook(file); } ISheet sheet = workbook.GetSheetAt(0); string cellValue = sheet.GetRow(0).GetCell(0).ToString();

  6. "Read data from an open Excel file using Aspose.Cells"

    • Description: This query involves using the Aspose.Cells library to read data from an open Excel file.
    // Code Implementation using Aspose.Cells; Workbook workbook = new Workbook("path/to/your/open/excel/file.xlsx"); Worksheet worksheet = workbook.Worksheets[0]; string cellValue = worksheet.Cells["A1"].StringValue;

  7. "Read data from an open Excel file using GemBox.Spreadsheet"

    • Description: This query involves using the GemBox.Spreadsheet library to read data from an open Excel file.
    // Code Implementation using GemBox.Spreadsheet; SpreadsheetInfo.SetLicense("FREE-LIMITED-KEY"); ExcelFile workbook = ExcelFile.Load("path/to/your/open/excel/file.xlsx"); ExcelWorksheet worksheet = workbook.Worksheets[0]; string cellValue = worksheet.Cells["A1"].Value.ToString();

  8. "Read data from an open Excel file using ExcelDataReader with FileStream"

    • Description: This query involves using the ExcelDataReader library with a FileStream to read data from an open Excel file.
    // Code Implementation using ExcelDataReader; using (FileStream stream = File.Open("path/to/your/open/excel/file.xlsx", FileMode.Open, FileAccess.Read)) { IExcelDataReader excelReader = ExcelReaderFactory.CreateReader(stream); while (excelReader.Read()) { string cellValue = excelReader.GetString(0); // Adjust index based on your Excel structure } }

  9. "Read data from an open Excel file using OLEDB"

    • Description: This query involves using OLEDB to read data from an open Excel file.
    // Code Implementation using System.Data.OleDb; string connectionString = "Provider=Microsoft.ACE.OLEDB.12.0;Data Source=path/to/your/open/excel/file.xlsx;Extended Properties=Excel 12.0;"; using (OleDbConnection connection = new OleDbConnection(connectionString)) { connection.Open(); OleDbCommand command = new OleDbCommand("SELECT * FROM [Sheet1$]", connection); using (OleDbDataReader reader = command.ExecuteReader()) { while (reader.Read()) { string cellValue = reader.GetString(0); // Adjust index based on your Excel structure } } }

  10. "Read data from an open Excel file using ExcelDataReader and ExcelPackage"

    • Description: This query involves combining ExcelDataReader and ExcelPackage for reading data from an open Excel file.
    // Code Implementation using ExcelDataReader; using OfficeOpenXml; using (FileStream stream = File.Open("path/to/your/open/excel/file.xlsx", FileMode.Open, FileAccess.Read)) { using (IExcelDataReader excelReader = ExcelReaderFactory.CreateOpenXmlReader(stream)) { while (excelReader.Read()) { string cellValue = excelReader.GetString(0); // Adjust index based on your Excel structure } } }

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