如何把数字导出成文本？ about magicodes.ie HOT 8 CLOSED

[ExcelExporter]
        class LongToStr
        {
            [ExporterHeader("Long",format:"@")]
            public long Long { get; set; }
            [ExporterHeader("String")]
            public String Str => Long.ToString();
        }

List<LongToStr> list = new List<LongToStr>();
            for (long i = 9223372036854775797L; i > 9223372036854775787L; i--)
            {
                list.Add(new LongToStr(){Long = i});
            }
            ExcelExporter exporter = new ExcelExporter();
            exporter.Export("test.xlsx", list);