关于c#:修改excel单元格

Modify excel cell

早上好，
我想从现有的 Excel 文件中编辑一些单元格。我尝试使用 EPPlus 和普通的 OpenXml 类。然而我失败了。在这两种情况下，程序都不会崩溃，但总是返回旧的(未修改的)excel。请问，我做错了什么？

试验 1 - EPPlus：

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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"
};

我怎么说它返回旧的 excel。但在调试模式下，它也包含新值。看来不能修改 memoryStream。

试用 2 - OpenXml 类

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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"
};

和辅助方法：

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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;
}

再次感谢您的帮助。

这两种情况的问题是修改后的工作簿没有保存回流：

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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"
};

虽然已经回答了这个问题，但我会根据我的经验补充一下。

从FileInfo而不是Stream打开ExcelPackage更容易，然后保存变得更简单。

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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();

相关讨论

您可以使用 Microsoft 的 Interop dll 来编辑 Office 文档 http://msdn.microsoft.com/en-us/library/15s06t57.aspx。将"Microsoft.Office.Interop.Excel.dll"添加到您的解决方案中。使用此代码，我更改了 2 个单元格值。

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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();
}

在程序运行更改为正确值之后，我已经开始使用 Test1 和 Test2。

Situation

相关讨论

我正在使用 ClosedXML，其中更新单元格值很容易：

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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();

可以在此处找到 NuGet 包。

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//这可以帮助您在文件 excel 中设置单元格：使用 System.Data.OleDb;

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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) { }
}

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