public string ExportToExcel(List <List <string> > dataRows, List <string> columnTitles = null, string sheetName = null)
{
#region Validation
if (dataRows == null || dataRows.Count == 0)
{
return(null);
}
if (string.IsNullOrWhiteSpace(sheetName))
{
sheetName = "Sheet1";
}
if (columnTitles != null && columnTitles.Count != dataRows[0].Count)
{
columnTitles = null;
}
#endregion
using (var memoryStream = new MemoryStream())
{
try
{
var spreadsheetDocument = SpreadsheetDocument.Create(memoryStream, SpreadsheetDocumentType.Workbook);
// Add a WorkbookPart to the document.
WorkbookPart workbookpart = spreadsheetDocument.AddWorkbookPart();
workbookpart.Workbook = new Workbook();
// Add a WorksheetPart to the WorkbookPart.
WorksheetPart worksheetPart = workbookpart.AddNewPart <WorksheetPart>();
worksheetPart.Worksheet = new Worksheet(new SheetData());
// Add Sheets to the Workbook.
Sheets sheets = spreadsheetDocument.WorkbookPart.Workbook.AppendChild(new Sheets());
// Append a new worksheet and associate it with the workbook.
Sheet sheet = new Sheet()
{
Id = spreadsheetDocument.WorkbookPart.GetIdOfPart(worksheetPart),
SheetId = 1,
Name = sheetName
};
sheets.Append(sheet);
int firstRowPos = 1;
if (columnTitles != null)
{
for (var colIdx = 1; colIdx <= columnTitles.Count; colIdx++)
{
worksheetPart.InsertString(colIdx, firstRowPos, columnTitles[colIdx - 1]);
}
firstRowPos++;
}
for (var rowIdx = firstRowPos; rowIdx < dataRows.Count + firstRowPos; rowIdx++)
{
for (var colIdx = 1; colIdx <= dataRows[rowIdx - firstRowPos].Count; colIdx++)
{
worksheetPart.InsertString(colIdx, rowIdx, dataRows[rowIdx - firstRowPos][colIdx - 1]);
}
}
workbookpart.Workbook.Save();
spreadsheetDocument.Close();
memoryStream.Seek(0, SeekOrigin.Begin);
var data = memoryStream.ToBytes();
var dataId = SaveData(data);
return(dataId);
}
catch (Exception ex)
{
return(null);
}
}
}