C# 生成二维码

在网上下载 ThoughtWorks.QRCode.dll

以下为代码

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using ThoughtWorks.QRCode.Codec;
using ThoughtWorks.QRCode.Codec.Data;

namespace WindowsFormsApplication1
{
    //在界面上放二个button, 一个textbox  , 一个picturebox
    public partial class Form1 : Form
    {
        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
　　　　　　 //生成二维码图片,
            ThoughtWorks.QRCode.Codec.QRCodeEncoder encoder = new QRCodeEncoder();
            encoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;//编码方式(注意：BYTE能支持中文，ALPHA_NUMERIC扫描出来的都是数字)
            encoder.QRCodeScale = 6;//大小(值越大生成的二维码图片像素越高)
            encoder.QRCodeVersion = 0;//版本(注意：设置为0主要是防止编码的字符串太长时发生错误)
            encoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;//错误效验、错误更正(有4个等级)
            String qrdata = textBox1.Text;
            System.Drawing.Bitmap bp = encoder.Encode(qrdata.ToString(), Encoding.GetEncoding("GB2312")); 
            Image image = bp;
            pictureBox1.Image = bp;

            //保存二维码图片：
            SaveFileDialog sf = new SaveFileDialog();
            sf.Title = "选择保存文件位置";
            sf.Filter = "保存图片(*.jpg) |*.jpg|所有文件(*.*) |*.*";
            //设置默认文件类型显示顺序
            sf.FilterIndex = 1;
            //保存对话框是否记忆上次打开的目录
            sf.RestoreDirectory = true;
            if (sf.ShowDialog() == DialogResult.OK)
            {
                Image im = this.pictureBox1.Image;
                //获得文件路径
                string localFilePath = sf.FileName.ToString();
                if (sf.FileName != "")
                {
                    string fileNameExt = localFilePath.Substring(localFilePath.LastIndexOf("\\") + 1);//获取文件名，不带路径
                    // newFileName = fileNameExt+DateTime.Now.ToString("yyyyMMdd")  ;//给文件名后加上时间
                    string FilePath = localFilePath.Substring(0, localFilePath.LastIndexOf("."));  //获取文件路径，带文件名,不带后缀
                    string fn = sf.FileName;
                    pictureBox1.Image.Save(FilePath + "-" + DateTime.Now.ToString("yyyyMMdd") + ".jpg");
                }
            }

        }
        
        private void button2_Click(object sender, EventArgs e)
        {
            //解析二维码信息
            QRCodeDecoder decoder = new QRCodeDecoder();
            String decodedString = decoder.decode(new QRCodeBitmapImage(new Bitmap(pictureBox1.Image)));
this.textBox1.Text = decodedString; 

        }
    }
}