How to Export Data to Excel
The provided guide demonstrates a workaround for generating HTML files with tables, but this approach can be unreliable when Excel interprets and imports these files. A more effective method is to create a dedicated Excel file using a library such as EPPlus.
Using EPPlus
EPPlus offers the LoadFromDataTable and LoadFromCollection methods to populate an Excel range with data from a data table or a generic collection, respectively. The column or property names serve as headers during loading.
Example Code:
public ActionResult ExportData()
{
DataTable dataTable = GetData(); // Method to retrieve data
using (ExcelPackage package = new ExcelPackage())
{
var ws = package.Workbook.Worksheets.Add("My Sheet");
ws.Cells["A1"].LoadFromDataTable(dataTable, true); // Load with true to include headers
var stream = new MemoryStream();
package.SaveAs(stream);
string fileName = "myfilename.xlsx";
string contentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
stream.Position = 0;
return File(stream, contentType, fileName);
}
}
Formatting and Styling:
Once data is loaded, you can further customize and style the Excel range:
var range = ws.Cells["A1"].LoadFromDataTable(table); range.Style.Numberformat.Format = "#,##0.00"; // Set number format range.Style.HorizontalAlignment = ExcelHorizontalAlignment.Right; // Set horizontal alignment
Customizing Output:
To alleviate potential issues when creating large files, or to avoid duplicate writes, you can create a custom FileResult handler for EPPlus packages:
public class EpplusResult : FileResult
{
public EpplusResult(ExcelPackage package)
: base("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet")
{
Package = package;
}
public ExcelPackage Package { get; private set; }
protected override void WriteFile(HttpResponseBase response)
{
using (Package)
{
Package.SaveAs(response.OutputStream);
}
}
}
This custom result can then be used in the controller action:
public FileResult ExportData()
{
ExcelPackage package = new ExcelPackage();
var ws = package.Workbook.Worksheets.Add("My Sheet");
... // Load and format data
return new EpplusResult(package) { FileDownloadName = "SomeFile.xlsx" };
}
This approach ensures direct writing to the output stream, optimizing performance for large files.
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