npoi 打印excel

您可以使用NPOI的PrintSetup类来设置打印选项，例如打印区域、打印方向、纸张大小等。以下是一个示例代码，演示如何使用NPOI将Excel文件打印出来：

using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using NPOI.SS.Util;

//加载Excel文件
XSSFWorkbook workbook = new XSSFWorkbook("example.xlsx");
ISheet sheet = workbook.GetSheetAt(0);

//设置打印选项
IPrintSetup printSetup = sheet.PrintSetup;
printSetup.Landscape = true; //设置打印方向为横向
printSetup.PaperSize = (short)PaperSize.A4; //设置纸张大小为A4
sheet.SetPrintArea(0, 0, 10, 10); //设置打印区域为A1到K11

//打印Excel文件
System.Drawing.Printing.PrintDocument pd = new System.Drawing.Printing.PrintDocument();
pd.PrinterSettings.PrinterName = "PrinterName"; //设置打印机名称
pd.PrinterSettings.PrintToFile = false;
pd.DefaultPageSettings.Landscape = true; //设置打印方向为横向
pd.DefaultPageSettings.PaperSize = new System.Drawing.Printing.PaperSize("A4", 827, 1169); //设置纸张大小为A4

using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
    workbook.Write(ms);
    pd.PrinterSettings.PrintFileName = "example.xlsx";
    pd.PrintPage += (sender, e) =>
    {
        using (var img = System.Drawing.Image.FromStream(ms))
        {
            e.Graphics.DrawImage(img, e.MarginBounds);
        }
        e.HasMorePages = false;
    };
    pd.Print();
}

请注意，这只是一个示例代码，您可能需要根据实际情况调整其中的参数。