利用NPOI将excel转成PDF导出，实际上也是先生成excel文件，然后将excel文件转成PDF文件，需要先确认已经安装好了office，并且已经在服务器上开通了相应的权限
/// <summary>
/// 转换excel成PDF文档
/// </summary>
/// <param name="_lstrInputFile">原文件路径</param>
/// <param name="_lstrOutFile">pdf文件输出路径</param>
/// <returns>true 成功</returns>
public bool exceltoPDF(string _lstrInputFile, string _lstrOutFile)
{
Microsoft.Office.Interop.Excel.Application lobjExcelApp = null;
Microsoft.Office.Interop.Excel.Workbooks lobjExcelWorkBooks = null;
Microsoft.Office.Interop.Excel.Workbook lobjExcelWorkBook = null;
string lstrTemp = string.Empty;
object lobjMissing = System.Reflection.Missing.Value;
try
{
lobjExcelApp = new Microsoft.Office.Interop.Excel.Application();
lobjExcelApp.Visible = false;
lobjExcelWorkBooks = lobjExcelApp.Workbooks;
lobjExcelWorkBook = lobjExcelWorkBooks.Open(_lstrInputFile, true, true, lobjMissing, lobjMissing, lobjMissing, true,
lobjMissing, lobjMissing, lobjMissing, lobjMissing, lobjMissing, false, lobjMissing, lobjMissing);
//Microsoft.Office.Interop.Excel 12.0.0.0之后才有这函数
lstrTemp = System.IO.Path.GetTempPath() + Guid.NewGuid().ToString() + ".xlsx" + (lobjExcelWorkBook.HasVBProject ? 'm' : 'x');
//输出为PDF 第一个选项指定转出为PDF,还可以指定为XPS格式
lobjExcelWorkBook.ExportAsFixedFormat(Microsoft.Office.Interop.Excel.XlFixedFormatType.xlTypePDF, _lstrOutFile, Microsoft.Office.Interop.Excel.XlFixedFormatQuality.xlQualityStandard, Type.Missing, false, Type.Missing, Type.Missing, false, Type.Missing);
lobjExcelWorkBooks.Close();
lobjExcelApp.Quit();
return true;
}
catch (Exception ex)
{
return false;
throw ex;
}
}