Excel 使用 C# 导出到 Excel 时将日期列视为常规列

Excel treating date column as general when exporting to Excel using C#

我正在使用 EPPlus 库导出 Excel 中的报告。其中一列是日期类型,但在导出到 Excel 后,当我打开该文件时,它将将该列视为 "General",除非我右键单击它并将其类型设置为 "Date" .

以下是我的代码:

private void ExportToExcel(DataTable dataTable)
{
    //Althought the column type is already date in dataTable but even if I use following line Excel doesn't treat it as Date
    dataTable.Columns["Created On"].DataType = typeof(DateTime);

    foreach (DataRow row in dataTable.Rows)
    {
        row["Created On"] = Convert.ToDateTime(row["Created On"]. 
 ToString()).ToString("yyyy-MM-dd");
    }

    ExcelPackage excel = new ExcelPackage();
    var workSheet = excel.Workbook.Worksheets.Add("MyReport");
    var totalCols = dataTable.Columns.Count;
    var totalRows = dataTable.Rows.Count;
    string fileName = "MyReport[" + DateTime.Now.ToString("yyyy-MM-dd") + "].xlsx";

    for (var col = 1; col <= totalCols; col++)
    {
        workSheet.Cells[1, col].Value = dataTable.Columns[col - 1].ColumnName;
        workSheet.Cells[1, col].Style.Font.Bold = true;
    }

    for (var row = 1; row <= totalRows; row++)
    {
        for (var col = 0; col < totalCols; col++)
        {
            workSheet.Cells[row + 1, col + 1].Value = dataTable.Rows[row - 1][col];
        }
    }
    workSheet.Cells.Style.Font.Size = 11;
    workSheet.Cells.AutoFitColumns();

//Rest of the code

}

以下是此列在 Excel 中的截屏。

如何确保 Excel 将我的日期列视为日期?

要在 epplus 中将文本设置为 DateTime 格式,您需要为单元格设置格式类型

EG:

1) 对于简单的短日期模式

 workSheet.Cells[row, 3].Style.Numberformat.Format = DateTimeFormatInfo.CurrentInfo.ShortDatePattern;

2) 如果你想要特定的格式,比如带时间、小时等的日期时间,那么

workSheet.Column(dateColIndex).Style.Numberformat.Format = "mm/dd/yyyy hh:mm:ss AM/PM";