声明新TextFieldParser（）时丢失流数据

Question

我将一个来自csv文件的Stream从我的Controller传递到我的业务层进行处理。流使得方法没问题但是只要我声明我的TextFieldParser并传入我的流，数据就会消失，因此不会被处理。

    public CsvRecordReportModel processCsvStream(Stream dataStream, RecordSource recordSource, string fileName)
    {
        //Create instance of the report. 
        var report = new CsvRecordReportModel();
        report.InsertedRecordCount = 0;
        report.FileName = fileName;

        using (TextFieldParser csvParser = new TextFieldParser(dataStream))
        {
            csvParser.CommentTokens = new string[] {"#"};
            csvParser.SetDelimiters(new string[] {","});
            csvParser.HasFieldsEnclosedInQuotes = true;

            // Skip the row with the column names
            csvParser.ReadLine();

            while (!csvParser.EndOfData)
            {
               //Do stuff
            }
        }
    }