c#预览正确，打印是空的

printPreviewDialog1.Document = printDocument1;
Margins margin = new Margins(20, 20, 20, 20);
printDocument1.DefaultPageSettings.Margins = margin;
this.printDocument1.DefaultPageSettings.PaperSize.RawKind = 9;
printDocument1.PrintPage += new PrintPageEventHandler(this.printPage);
this.printPreviewDialog1.ShowDialog();

点击打印 void tsb_Click(object sender, EventArgs e)
{
try {
printDialog1 = new PrintDialog();
printDialog1.Document = printDocument1;
//打开打印对话框
DialogResult result = printDialog1.ShowDialog();
if (result == DialogResult.OK)
printDocument1.Print();//开始打印
if (result == DialogResult.Cancel)
printDialog1.Dispose();
}
catch (Exception ex)
{
throw ex;
}

求大腿指点！！！

printDocument1一共new了几次

我不会~~~但还是要微笑~~~：）