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bool result = false;
foreach(System.Drawing.Printing .PaperSize pSize in printdoc.PrinterSettings.PaperSizes )
{
if (pSize.Kind == System.Drawing.Printing.PaperKind.A3)
{
printdoc.DefaultPageSettings.PaperSize = pSize;
result = true;
break;
}
}
if(!result)
MessageBox.Show("当前打印机不支持该纸张类型")
else
printdoc.Print();