C# - How to Print a PictureBox [QRCode] in WinForm Application

生成二维码

1. 通过 Nuget 安装 QRCoder
2. 添加 PictureBox 控件时，将其 SizeMode 设置为 Zoom

二维码生成代码：

private void BtnGenerate_Click(object sender, EventArgs e)
{
    var qg = new QRCoder.QRCodeGenerator();
    var myData = qg.CreateQrCode(TxtCode.Text, QRCoder.QRCodeGenerator.ECCLevel.H);
    var code = new QRCoder.QRCode(myData);
    PicQRCode.Image = code.GetGraphic(50);
}

打印图像

利用 .NET Framework 自带的 PrintDocument 调用打印机。

private void PrintBarCode()
{
    var pd = new PrintDialog();
    var doc = new PrintDocument();
    doc.PrintPage += Doc_PrintPage;
    pd.Document = doc;
    if (pd.ShowDialog() == DialogResult.OK)
    {
        doc.Print();
    }
}
private void Doc_PrintPage(object sender, PrintPageEventArgs e)
{
    var bm = new Bitmap(PicQRCode.Width, PicQRCode.Height);
    PicQRCode.DrawToBitmap(bm, new Rectangle(0, 0, PicQRCode.Width, PicQRCode.Height));
    e.Graphics.DrawImage(bm, 0, 0);
    bm.Dispose();
}