C# - Windows窗体-尝试打印-未绘制任何内容-打印对话框

private void buttonPrint_Click(object sender, EventArgs e)
{
    PrintDialog printDialog = new PrintDialog();
    PrintDocument printDocument = new PrintDocument();

    printDocument.PrintPage += new PrintPageEventHandler(PrintDocument_PrintPage);

    printDialog.Document = printDocument;
    if (printDialog.ShowDialog() == DialogResult.OK)
    {
        printDocument.Print();
    }
}

private void PrintDocument_PrintPage(object sender, PrintPageEventArgs e)
{
    // 在这里绘制内容
    Graphics g = e.Graphics;
    g.DrawString("Hello, World!", new Font("Arial", 12), Brushes.Black, 100, 100);

    e.HasMorePages = false; // 如果有多页，设置为true
}

printDocument.DefaultPageSettings.PaperSize = new PaperSize("A4", 827, 1169);
printDocument.DefaultPageSettings.Margins = new Margins(50, 50, 50, 50);

private void buttonPreview_Click(object sender, EventArgs e)
{
    PrintPreviewDialog previewDialog = new PrintPreviewDialog();
    previewDialog.Document = printDocument;
    previewDialog.ShowDialog();
}

try
{
    printDocument.Print();
}
catch (Exception ex)
{
    MessageBox.Show("打印错误: " + ex.Message);
}