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using Spire.Xls;

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Workbook workbook = new Workbook();

workbook.LoadFromFile("示例.xlsx");

workbook.SaveToFile("输出.pdf", FileFormat.PDF);

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Workbook workbook = new Workbook();

workbook.LoadFromFile("示例.xlsx");

Worksheet sheet = workbook.Worksheets[0];

sheet.SaveToPdf("输出1.pdf");

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//载入Excel文档

Workbook workbook = new Workbook();

workbook.LoadFromFile("示例.xlsx");

//获取第一张工作表

Worksheet sheet = workbook.Worksheets[0];

//设置打印区域（设置你想要转换的单元格范围）

sheet.PageSetup.PrintArea = "A1:C8";

//将指定范围内的单元格保存为PDF           

sheet.SaveToPdf("输出2.pdf");