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OpenFileDialog与 EPPlus 一起使用。我收到以下编译错误:

The name 'sheet' does not exist in the current context

现在,明显的问题是如何将选定的 Excel 文件与我的 EPPPlus & 2 关联起来,我该怎么做才能消除上述错误?

using OfficeOpenXml;
using OfficeOpenXml.Drawing;

private void btn_ReadExcelToArray_Click(object sender, EventArgs e)
{
  fd.Filter = "Excel Files|*.xlsx";
  fd.InitialDirectory = @"C:\";
  if (fd.ShowDialog() == DialogResult.OK)
  {          
    var columnimport = sheet.Cells["A2:A"];
    foreach (var cell in columnimport)
    {
        var column1CellValue = cell.GetValue<string>();
    }
  }
}
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