用到外部一个DLL文件(ThoughtWorks.QRCode.dll)，看效果

生成截图

识别截图

生成二维码后右键菜单可以保存二维码图片，然后可以到识别模式下进行识别，当然生成后可以用手机扫描识别出来，或者用手机直接扫描以上两张图也能看到识别后的结果。

使用方法，在解决方案中引用上面那个dll文件，引入命名空间

using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

看完整的生成二维码代码

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Text;

using System.Windows.Forms;

using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

namespace 二维码

{

    public partial class UC_To : UserControl

    {

        public UC_To()

        {

            InitializeComponent();

        }

        private void button1_Click(object sender, EventArgs e)

        {

            if (textBox1.Text.Trim() != "")

            {

                string enCodeString = textBox1.Text;

                QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

                pictureBox1.Image = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);

            }

            //else

                //MessageBox.Show("请输入内容");

        }

        private void 保存图片ToolStripMenuItem_Click(object sender, EventArgs e)

        {

            if (pictureBox1.Image != null)

            {

                SaveFileDialog s = new SaveFileDialog();

                s.Title = "保存二维码图片";

                s.Filter = "图片文件(*.jpg)|*.jpg";

                if(s.ShowDialog()==DialogResult.OK)

                try

                {

                    pictureBox1.Image.Save(s.FileName,System.Drawing.Imaging.ImageFormat.Jpeg);

                    MessageBox.Show("保存成功");

                }

                catch { MessageBox.Show("保存失败"); }

            }

        }

    }

}

看完整的识别二维码的代码

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Drawing;

using System.Data;

using System.Text;

using System.Windows.Forms;

using ThoughtWorks.QRCode.Codec;

using ThoughtWorks.QRCode.Codec.Data;

namespace 二维码

{

    public partial class UC_From : UserControl

    {

        public UC_From()

        {

            InitializeComponent();

        }

        string filepath = "";

        private void button1_Click(object sender, EventArgs e)

        {

            OpenFileDialog p = new OpenFileDialog();

            p.Title = "请选择二维码文件";

            p.Filter = "图片文件(*.jpg)|*.jpg";

            p.Multiselect = false;

            if (p.ShowDialog() == DialogResult.OK)

            {

                filepath = p.FileName;

                System.Threading.Thread t = new System.Threading.Thread(ss);

                t.IsBackground = true;

                t.Start();

            }

        }

        private void ss()

        {

            if (filepath != "")

            {

                string tt = "";

                try

                {

                    Invoke((EventHandler)delegate

                    {

                        button1.Enabled = false;

                        button1.Text = "Waiting！";

                        pictureBox1.Image = new Bitmap(filepath);

                    });

                    //pictureBox1.Size = new Size(new Bitmap(filepath).Size.Width, new Bitmap(filepath).Size.Height);

                    QRCodeDecoder qrDecoder = new QRCodeDecoder();

                    string txtMsg = qrDecoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)), Encoding.UTF8);

                    tt = txtMsg;

                }

                catch { tt = "识别失败"; }

                Invoke((EventHandler)delegate

                {

                    textBox1.Text = tt;

                    button1.Enabled = true;

                    button1.Text = "识别";

                });

            }

            System.Threading.Thread.CurrentThread.Abort();

        }

        private void textBox1_KeyPress(object sender, KeyPressEventArgs e)

        {

            e.Handled = true;

        }

    }

}