从c＃中的excel读取时出错

Question

我有一个代码应该从excel文档中读取并告诉我里面是什么，我得到了一个错误。因此，当我使用关键字“excel”时，程序应该打开一个文件对话框，让我选择一个excel文档，之后应该告诉我里面是什么。这是代码

                  case "excel":
                if (openFileDialog1.ShowDialog() == System.Windows.Forms.DialogResult.OK)
                {
                    Microsoft.Office.Interop.Excel.Application _excelApp = new Microsoft.Office.Interop.Excel.Application();
                    _excelApp.Visible = true;

                    string fileName = @"C:\Users\N.Horatiu\Desktop\a.docx\\";

                    Workbook workbook = _excelApp.Workbooks.Open(fileName,
                        Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                        Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                        Type.Missing, Type.Missing, Type.Missing, Type.Missing,
                        Type.Missing, Type.Missing);

                    Worksheet worksheet = (Worksheet)workbook.Worksheets[1];

                    Microsoft.Office.Interop.Excel.Range excelRange = worksheet.UsedRange;

                    object[,] valueArray = (object[,])excelRange.get_Value(
                                XlRangeValueDataType.xlRangeValueDefault);

                    for (int row = 1; row <= worksheet.UsedRange.Rows.Count; ++row)
                    {
                        for (int col = 1; col <= worksheet.UsedRange.Columns.Count; ++col)
                        {
                            ss.SpeakAsync(valueArray[row, col].ToString());
                        }
                    }

                    workbook.Close(false, Type.Missing, Type.Missing);
                    Marshal.ReleaseComObject(workbook);

                    _excelApp.Quit();
                    Marshal.FinalReleaseComObject(_excelApp);
                }
                break;

这是我选择文档后得到的错误：

Answer 1

由于文件名末尾有黑色标记，文件被视为文件夹。

删除这些黑色墨水并重试

string fileName = @"C:\Users\N.Horatiu\Desktop\a.xlsx";