如何在C＃中读取Excel（.XLS和.XLSX）文件？

Question

我正在尝试在C＃dot net core 2.2中读取Excel文件。为了阅读excel，我使用了EpPlus。我已经从File uploads in ASP.NET Core获得了参考。我有这样的Api

 public async Task<ActionResult<ReappropiationAccountViewModel>> Post(IFormFile file)
 {
        return Ok(await Mediator.Send(new SaveReappropriationAccountCommand { ReappropiationAccountFile = file }));
 }

我的命令就是这样

public class SaveReappropriationAccountCommand : IRequest<ReappropiationAccountViewModel>
{
    public IFormFile ReappropiationAccountFile { get; set; }
}

在我的处理程序中，我试图像这样阅读excel

        using (var memoryStream = new MemoryStream())
        {
            await request.ReappropiationAccountFile.CopyToAsync(memoryStream);

            using (ExcelPackage package = new ExcelPackage(memoryStream))
            {
                ExcelWorksheet worksheet = package.Workbook.Worksheets[0];

                int rowCount = worksheet.Dimension.End.Row;
                int colCount = worksheet.Dimension.End.Column;

                for (int row = 1; row <= rowCount; row++)
                {
                    for (int col = 1; col <= colCount; col++)
                    {
                        var rowValue = worksheet.Cells[row, col].Value;
                    }
                }

            }
        }

但是我无法读取上载的excel，因为它在InvalidDataException行中抛出了using (ExcelPackage package = new ExcelPackage(memoryStream))。

异常消息InvalidDataException: The file is not an valid Package file. If the file is encrypted, please supply the password in the constructor.

一切似乎都是正确的，但无法读取excel数据。 Tryig读取此Excel文件

我的问题是我在哪里做错了？任何建议和解决方案都非常感谢。

Answer 1

您需要在写完内存流并将其传递给ExcelPackage之前将其设置回开头：

memoryStream.Position = 0;