EPPlus 日期格式正确生成

Question

我的日期格式有问题，我有一个通用的 class，它显示属性和属性类型。
EPPlus 为日期列生成了良好的格式，但另一个却不是。

public class ExcelHelper
{
    public static byte[] GenerateXls<T>(List<T> dataSource, string sheetName)
    {

        using (var pck = new ExcelPackage())
        {

            var modelProperties = typeof(T).GetProperties();
            Type typeNullDatetime = typeof(DateTime?);
            Type typeDateTime = typeof(DateTime);
            Type typeDecimal = typeof(decimal);
            Type typeNullDecimal = typeof(decimal?);
            var ws = pck.Workbook.Worksheets.Add(sheetName);
            ws.Cells[1, 1].LoadFromCollection(dataSource, true, OfficeOpenXml.Table.TableStyles.Light1);


            for (var j = 0; j < modelProperties.Length; j++)
            {
                if (modelProperties[j].PropertyType == typeNullDatetime
                        && DateTimeFormatInfo.CurrentInfo != null)
                    ws.Column(j).Style.Numberformat.Format =
                        DateTimeFormatInfo.CurrentInfo.ShortDatePattern;

                if (modelProperties[j].PropertyType == typeDateTime)
                    if (DateTimeFormatInfo.CurrentInfo != null)
                        ws.Column(j).Style.Numberformat.Format =
                            DateTimeFormatInfo.CurrentInfo.ShortDatePattern;

                if (modelProperties[j].PropertyType == typeDecimal)
                    ws.Column(j).Style.Numberformat.Format = "0.00";

                if (modelProperties[j].PropertyType == typeNullDecimal)
                    ws.Column(j).Style.Numberformat.Format = "0.00";
            }

            ws.Cells.AutoFitColumns();
            return pck.GetAsByteArray();

        }

    }
}

var result = ExcelHelper.GenerateXls(dtos, "data");

为包含以下两个属性的 class 生成的 excel：

  public DateTime IssueDate { get; set; }
  public DateTime DeadlineDate { get; set; }

Issue Date  Deadline Date
25/06/2019  43641
25/06/2019  43641
05/06/2019  43622
27/05/2019  43612
24/04/2019  43579
15/04/2019  43570

Answer 1

在 EPPlus 中，列和行是不是基于零的索引而是基于 1 的索引。所以第一行的第一列有 Row=1 和 Column=1。您需要像下面这样更改循环

...
for (var j = 1; j <= modelProperties.Length; j++)
...

或

...
ws.Column(j+1)
...

Answer 2

当我想根据给定的类型动态地格式化列时，我遇到了同样的问题。我想出了一个解决空类型检查的解决方案。您当然可以将数字格式（和其他样式）设置为您喜欢的任何格式。希望对您有所帮助！

public static void FormatColumns<T>(ExcelWorksheet sheet)
{
    var properties = typeof(T).GetProperties();
    foreach (var property in properties)
    {
        var columnIndex = Array.IndexOf(properties, property) + 1; //Since it is not zero based
        var type = Nullable.GetUnderlyingType(property.PropertyType) ?? property.PropertyType; // Checks if it's a nullable
        var typeCode = Type.GetTypeCode(type);
        FormatRange(sheet.Column(columnIndex), typeCode);
    }
}
public static void FormatRange(ExcelColumn range, TypeCode typeCode)
{
    switch (typeCode)
    {
        case TypeCode.Int32:
            range.Style.Numberformat.Format = "General";
            break;
        case TypeCode.Double:
            range.Style.Numberformat.Format = "_(* #,##0.00_);_(* (#,##0.00);_(* \" - \"??_);_(@_)";
            break;
        case TypeCode.Decimal:
            range.Style.Numberformat.Format = "_ * #,##0.00_ ;[red]_ * -#,##0.00_ ;_ * \"-\"??_ ;_ @_ ";
            break;
        case TypeCode.DateTime:
            range.Style.Numberformat.Format = "dd-MMM-yy";
            break;
        default:
            range.Style.Numberformat.Format = "General";
            break;
    }
}

EPPlus 日期格式正确生成

EPPlus dates FORMAT gengerated properly

c#

epplus