在C#中设置打印机纸张大小，如此简单

PrintDocument pd = new PrintDocument();
PaperSize p=null;
foreach(PaperSize ps in pd.PrinterSettings.PaperSizes)
{   if(ps.PaperName.Equals("A3"))
  p = ps;
} 
pd.DefaultPageSettings.PaperSize = p;
pd.Print();