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; 



        }

    }

}