问题
Good morning, I would like to edit some cells from already existing excell file. I tried use EPPlus and normal OpenXml classes. However I failed. In both situation program won't crash but always return old (not modified) excel. Please, what am I doing wrong?
Trial 1 - EPPlus:
MemoryStream memoryStream = new MemoryStream();
using (var fs = new FileStream(@"Path\Test.xlsx", FileMode.Open, FileAccess.Read))
{
byte[] buffer = new byte[1024];
int bytesRead = 0;
while ((bytesRead = fs.Read(buffer, 0, buffer.Length)) > 0)
{
memoryStream.Write(buffer, 0, bytesRead);
}
}
using (ExcelPackage excelPackage = new ExcelPackage(memoryStream))
{
ExcelWorkbook excelWorkBook = excelPackage.Workbook;
ExcelWorksheet excelWorksheet = excelWorkBook.Worksheets.First();
excelWorksheet.Cells[1, 1].Value = "Test";
excelWorksheet.Cells[3, 2].Value = "Test2";
excelWorksheet.Cells[3, 3].Value = "Test3";
excelPackage.Save();
}
memoryStream.Position = 0;
return new FileStreamResult(memoryStream, "application/xlsx")
{
FileDownloadName = "Tester.xlsx"
};
How i said it returns old excel. But in debug mode it contains new value also. It looks like memoryStream cannot be modified.
Trial 2 - OpenXml classes
Stream stream = System.IO.File.Open(@"Path\Test.xlsx", FileMode.Open);
using (SpreadsheetDocument spreadSheet = SpreadsheetDocument.Open(stream, true))
{
WorksheetPart worksheetPart = GetWorksheetPartByName(spreadSheet, "Sheet1");
Cell cell = GetCell(worksheetPart.Worksheet, "C", 3);
cell.CellValue = new CellValue("Testos");
cell.DataType = new EnumValue<CellValues>(CellValues.String);
worksheetPart.Worksheet.Save();
}
stream.Position = 0;
return new FileStreamResult(stream, "application/xlsx")
{
FileDownloadName = "Tester.xlsx"
};
And helper methods:
private static Row GetRow(Worksheet worksheet, uint rowIndex)
{
Row row;
if (worksheet.GetFirstChild<SheetData>().Elements<Row>().Where(r => r.RowIndex == rowIndex).Count() != 0)
{
row = worksheet.Elements<Row>().Where(r => r.RowIndex == rowIndex).FirstOrDefault();
}
else
{
row = new Row() { RowIndex = rowIndex };
worksheet.Append(row);
}
return row;
}
private static Cell GetCell(Worksheet worksheet, string columnName, uint rowIndex)
{
Row row = GetRow(worksheet, rowIndex);
string cellReference = columnName + rowIndex;
if (row.Elements<Cell>().Where(c => c.CellReference.Value == columnName + rowIndex).Count() > 0)
{
return row.Elements<Cell>().Where(c => c.CellReference.Value == cellReference).FirstOrDefault();
}
else
{
Cell refCell = null;
foreach (Cell cell in row.Elements<Cell>())
{
if (string.Compare(cell.CellReference.Value, cellReference, true) > 0)
{
refCell = cell;
break;
}
}
Cell newCell = new Cell() { CellReference = cellReference };
row.InsertBefore(newCell, refCell);
worksheet.Save();
return newCell;
}
}
private static WorksheetPart GetWorksheetPartByName(SpreadsheetDocument document, string sheetName)
{
IEnumerable<Sheet> sheets = document.WorkbookPart.Workbook.GetFirstChild<Sheets>().Elements<Sheet>().Where(s => s.Name == sheetName);
string relationshipId = sheets.First().Id.Value;
WorksheetPart worksheetPart = (WorksheetPart)document.WorkbookPart.GetPartById(relationshipId);
return worksheetPart;
}
Once more thank you for help.
回答1:
The problem in both cases is that the modified workbook is not saved back to the stream:
MemoryStream ms = new MemoryStream();
using (FileStream fs = File.OpenRead(@"Path\Test.xlsx"))
using (ExcelPackage excelPackage = new ExcelPackage(fs))
{
ExcelWorkbook excelWorkBook = excelPackage.Workbook;
ExcelWorksheet excelWorksheet = excelWorkBook.Worksheets.First();
excelWorksheet.Cells[1, 1].Value = "Test";
excelWorksheet.Cells[3, 2].Value = "Test2";
excelWorksheet.Cells[3, 3].Value = "Test3";
excelPackage.SaveAs(ms); // This is the important part.
}
ms.Position = 0;
return new FileStreamResult(ms, "application/xlsx")
{
FileDownloadName = "Tester.xlsx"
};
回答2:
although this is answered I'll add from my experience.
It is easier to open the ExcelPackage from FileInfo instead of Stream, then saving becomes simpler.
FileInfo file = new FileInfo(path);
using (var package = new ExcelPackage(file))
{
ExcelWorkbook workBook = package.Workbook;
ExcelWorksheet currentWorksheet = workBook.Worksheets.SingleOrDefault(w => w.Name == "sheet1");
int totalRows = currentWorksheet.Dimension.End.Row;
int totalCols = currentWorksheet.Dimension.End.Column;
for (int i = 2; i <= totalRows; i++)
{
try
{
currentWorksheet.Cells[i, 1].Value = "AAA";
}
catch (Exception ex)
{
_logger.Error(String.Format("Error: failed editing excel. See details: {0}", ex));
return;
}
}
package.Save();
回答3:
You can use the Interop dll's from Microsoft to edit office documents http://msdn.microsoft.com/en-us/library/15s06t57.aspx. Add the "Microsoft.Office.Interop.Excel.dll" to your solution. With this code i've changed 2 cell values.
static void Main(string[] args)
{
Application excel = new Application();
Workbook workbook = excel.Workbooks.Open(@"C:\Users\Martijn\Documents\Test.xlsx", ReadOnly: false, Editable:true);
Worksheet worksheet = workbook.Worksheets.Item[1] as Worksheet;
if (worksheet == null)
return;
Range row1 = worksheet.Rows.Cells[1, 1];
Range row2 = worksheet.Rows.Cells[2, 1];
row1.Value = "Test100";
row2.Value = "Test200";
excel.Application.ActiveWorkbook.Save();
excel.Application.Quit();
excel.Quit();
}
I've started with Test1 and Test2 wich after the program running changed into the proper values.
回答4:
I'm using ClosedXML where updating a cell value is a no-brainer:
var workbook = new XLWorkbook("HelloWorld.xlsx"); // load the existing excel file
var worksheet = workbook.Worksheets.Worksheet(1);
worksheet.Cell("A1").SetValue("Hello World!");
workbook.Save();
The NuGet package can be found here.
回答5:
//this help you to set cells in file excel : using System.Data.OleDb;
string connString = @"Provider=Microsoft.ACE.OLEDB.12.0;Data Source=" + Directory.GetCurrentDirectory() + "/swtlist.xlsx;" +
@"Extended Properties='Excel 12.0;HDR=Yes;';Persist Security Info=False;";
using (OleDbConnection connection = new OleDbConnection(connString))
{
connection.Open();
try
{
OleDbCommand cmd = new OleDbCommand("UPDATE [Feuil1$] SET d='yes' ", connection);
cmd.ExecuteNonQuery();
connection.Close();
}
catch (Exception ex) { }
}
来源：https://stackoverflow.com/questions/23168657/modify-excel-cell