zxing.net是.net平台下编解条形码和二维码的工具，使用非常方便。

首先下载二进制dll文件，引入工程；

代码：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ZXing.QrCode;
using ZXing;
using ZXing.Common;
using ZXing.Rendering;

namespace zxingTest
{
    public partial class Form1 : Form
    {
        EncodingOptions options = null;
        BarcodeWriter writer = null;

        public Form1()
        {
            InitializeComponent();
            options = new QrCodeEncodingOptions
            {
                DisableECI = true,
                CharacterSet = "UTF-8",
                Width = pictureBoxQr.Width,
                Height = pictureBoxQr.Height
            };
            writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.QR_CODE;
            writer.Options = options;
        }

        private void buttonQr_Click(object sender, EventArgs e)
        {
            if (textBoxText.Text == string.Empty)
            {
                MessageBox.Show("输入内容不能为空！");
                return;
            }
            Bitmap bitmap = writer.Write(textBoxText.Text);
            pictureBoxQr.Image = bitmap;
        }
    }
}

 效果：

 

 将字符编码时可以指定字符格式；默认为ISO-8859-1英文字符集，但一般移动设备常用UTF-8字符集编码，

可以通过QrCodeEncodingOptions设置编码方式。

如果要生成其他zxing支持的条形码，只要修改BarcodeWriter.Format就可以了。

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ZXing.QrCode;
using ZXing;
using ZXing.Common;
using ZXing.Rendering;

namespace zxingTest
{
    public partial class Form1 : Form
    {
        EncodingOptions options = null;
        BarcodeWriter writer = null;

        public Form1()
        {
            InitializeComponent();
            options = new EncodingOptions
            {
                //DisableECI = true,
                //CharacterSet = "UTF-8",
                Width = pictureBoxQr.Width,
                Height = pictureBoxQr.Height
            };
            writer = new BarcodeWriter();
            writer.Format = BarcodeFormat.ITF;
            writer.Options = options;
        }

        private void buttonQr_Click(object sender, EventArgs e)
        {
            if (textBoxText.Text == string.Empty)
            {
                MessageBox.Show("输入内容不能为空！");
                return;
            }
            Bitmap bitmap = writer.Write(textBoxText.Text);
            pictureBoxQr.Image = bitmap;
        }
    }
}

 

效果：

 输入字符串需要符合编码的格式，不然会报错。

解码方式：

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using ZXing.QrCode;
using ZXing;
using ZXing.Common;
using ZXing.Rendering;

namespace zxingTest
{
    public partial class Form1 : Form
    {
        BarcodeReader reader = null;

        public Form1()
        {
            InitializeComponent();
            reader = new BarcodeReader();
        }

        private void Form1_DragEnter(object sender, DragEventArgs e)//当拖放进入窗体
        {
            if (e.Data.GetDataPresent(DataFormats.FileDrop))
                e.Effect = DragDropEffects.Copy;    //显示拷贝效应
            else
                e.Effect = DragDropEffects.None;
        }

        private void Form1_DragDrop(object sender, DragEventArgs e) //当拖放放在窗体上
        {
            string[] fileNames = (string[])e.Data.GetData(DataFormats.FileDrop, false); //获取文件名
            if (fileNames.Length > 0)
            {
                pictureBoxPic.Load(fileNames[0]);   //显示图片
                Result result = reader.Decode((Bitmap)pictureBoxPic.Image); //通过reader解码
                textBoxText.Text = result.Text; //显示解析结果
            }
        }
    }
}