>To clarify, I have been tasked with writing an Excel worksheet parser, the input files can be xls or xlsx format. The data I require can be anywhere in the sheet but always has an identifier in column A where you start your import ( otherwise do nothing) , the minimum number of columns must be specified in advance.
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>An example usage from command line
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>Createcsv.exe excelfile.xlsx BT118
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>Where BT118 tells my program the identifier and number of columns to look for. I hope this helps.


Why do you need to subclass in this case ?