Form1.cs

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using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms;

namespace WindowsFormsApp13
{
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }
        // 窗体加载
        private void frm_qrcode_Load(object sender, EventArgs e)
        {
            cb_version.SelectedIndex = 1;

            cb_pixel.SelectedIndex = 0;

            cb_icon_size.SelectedIndex = 0;

            cb_icon_border.SelectedIndex = 1;
        }

        // 编码
        private void btn_encode_Click(object sender, EventArgs e)
        {
            int version = Convert.ToInt16(cb_version.Text);

            int pixel = Convert.ToInt16(cb_pixel.Text);

            string str_msg = tb_msg.Text;

            int int_icon_size = Convert.ToInt16(cb_icon_size.Text);

            int int_icon_border = Convert.ToInt16(cb_icon_border.Text);

            bool b_we = rb_we_y.Checked ? true : false;
            string path=AppDomain.CurrentDomain.BaseDirectory+ "demo.jpg";
            Bitmap bmp = chestnut_qrcode.Encoder.code(str_msg, version, pixel, path, int_icon_size, int_icon_border, b_we);

            pb_qrcode.Image = bmp;
        }

        // 保存
        private void btn_save_Click(object sender, EventArgs e)
        {
            if (pb_qrcode.Image != null)

                using (SaveFileDialog sfd = new SaveFileDialog())
                {
                    sfd.Filter = "(*.png)|*.png|(*.bmp)|*.bmp";

                    if (sfd.ShowDialog() == DialogResult.OK) pb_qrcode.Image.Save(sfd.FileName);