“ExcelWorksheet”不包含维度的定义

Question

using OfficeOpenXml.Core.ExcelPackage;

FileInfo existingFile = new FileInfo("C:/Users/Administrator/source/repos/Test.xlsx");
using (ExcelPackage package = new ExcelPackage(existingFile))
{
    //get the first worksheet in the workbook
    ExcelWorksheet worksheet = package.Workbook.Worksheets[1];
    int colCount = worksheet.Dimension.End.Column;  //get Column Count
    int rowCount = worksheet.Dimension.End.Row;     //get row count
    for (int row = 1; row <= rowCount; row++)
    {
        for (int col = 1; col <= colCount; col++)
        {
            Console.WriteLine(" Row:" + row + " column:" + col + " Value:" + worksheet.Cells[row, col].Value?.ToString().Trim());
        }
    }
}

我在网上找到了这段代码来读取 excel 文件，但我收到了问题中所述的错误。 网上搜索后找不到解决办法？ 如果有人可以提供帮助，那就太好了。