C＃-OpenOfficeXML日期格式

Question

使用OOX将一些数据传递到Excel电子表格时，我遇到了问题。事实是，除了日期以外，其他所有东西都很好用，日期以数字值而不是日期时间格式显示。这是我的代码：

private object ProcessXLSFile(PayeesWorkingHoursFullDataDTO payeesWorkingHoursFullDataDTO)
    {
        DataTable dt = Functions.ObjectToDataTable(payeesWorkingHoursFullDataDTO.ListWorkingHours);

        ExcelPackage pck = new ExcelPackage();

        //Create the worksheet
        ExcelWorksheet ws = pck.Workbook.Worksheets.Add("WorkSheet1");

        //Load the datatable into the sheet, starting from cell A1. Print the column names on row 1
        ws.Cells["A1"].LoadFromDataTable(dt, true);

        string _range = "G2:G" + (dt.Rows.Count + 1).ToString();
        using (ExcelRange col = ws.Cells[_range])
        {
            col.Style.Numberformat.Format = "#,##0.00";
            col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Right;
        }

        _range = "J2:J" + (dt.Rows.Count + 1).ToString();
        using (ExcelRange col = ws.Cells[_range])
        {
            col.Style.Numberformat.Format = "dd/MM/yyyy";
            col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
        }

        _range = "T2:T" + (dt.Rows.Count + 1).ToString();
        using (ExcelRange col = ws.Cells[_range])
        {
            col.Style.Numberformat.Format = "dd-MM-yyyy";
            col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
        }

        //Write it back to the client
        Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
        Response.AddHeader("content-disposition", "attachment; filename=Payee-Grid.xlsx");
        Response.BinaryWrite(pck.GetAsByteArray());
        Response.End();

        throw new NotImplementedException();
    }

这些行是应将列转换为日期时间的行：

_range = "J2:J" + (dt.Rows.Count + 1).ToString();
        using (ExcelRange col = ws.Cells[_range])
        {
            col.Style.Numberformat.Format = "dd/MM/yyyy";
            col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
        }

但是那绝对不行。

这是我创建数据表的代码：

public static DataTable ObjectToDataTable<T>(this IList<T> data)
    {
        PropertyDescriptorCollection properties = TypeDescriptor.GetProperties(typeof(T));
        DataTable table = new DataTable();
        foreach (PropertyDescriptor prop in properties)
            table.Columns.Add(prop.Name, Nullable.GetUnderlyingType(prop.PropertyType) ?? prop.PropertyType);
        foreach (T item in data)
        {
            DataRow row = table.NewRow();
            foreach (PropertyDescriptor prop in properties)
                row[prop.Name] = prop.GetValue(item) ?? DBNull.Value;
            table.Rows.Add(row);
        }
        return table;
    }

调试列，我已经看到，直到将列格式化为“ dd-MM-yyyy”的行，日期信息仍为datetime格式。我已经尝试了所有方法，但实际上似乎无法使它正常工作。你们对如何使其运作有任何想法吗？

Answer 1

您是否尝试过：

_range = "J2:J" + (dt.Rows.Count + 1).ToString();
        using (ExcelRange col = ws.Cells[_range])
        {
            col.Style.Numberformat.Format = "dd\\/MM\\/yyyy";
            col.Style.HorizontalAlignment = ExcelHorizontalAlignment.Center;
        }

有时候，由于未知的原因，您必须逃避某些事情:-)