C# implement QR code

Required import library

using System;
using System.Drawing;
using System.Text;
using ThoughtWorks.QRCode.Codec; // 第三方类库，C#类库中不存在

Invoke generation methods/functions in an object-oriented way

/// <summary>
/// 生成二维码
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void btn_CreateQRCode_Click(object sender, EventArgs e)
{
    
    
	// str 二维码的内容
    CreateQRImg(str);
}

Core code

Call the ThoughtWorks.QRCode.dllimplementation of the two-dimensional code library, to achieve common two-dimensional code

The comments are relatively clear and do not repeat too much

/// <summary>
/// 生成并保存二维码图片的方法
/// </summary>
/// <param name="str">输入的内容</param>
private void CreateQRImg(string str)
{
    
    
    Bitmap bt;
    string enCodeString = str;
    //生成设置编码实例
    QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
    //设置二维码的规模 默认 4
    qrCodeEncoder.QRCodeScale = 4;
    //设置二维码的版本 默认 7
    qrCodeEncoder.QRCodeVersion = 7;
    //设置错误检验级别 默认为中等
    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
    //生成二维码图片
    bt = qrCodeEncoder.Encode(enCodeString, Encoding.UTF8);
    //二维码图片名称
    string filename = DateTime.Now.ToString("[名字最好用时间防重]");
    //保存二维码图片在photos路径下
    bt.Save(Server.MapPath("~/photos/") + filename + ".jpg");
    //图片控件要显示的二维码图片路径
    this.img_QRImag.ImageUrl = "~/photos/" + filename + ".jpg";
}

• What I use here is to get the keyboard input value for demonstration
• Practical application strshould be automatically generated values
• ThoughtWorks.QRCode.dllThe class library is a NuGet download to be downloaded by yourself
• The project can be downloaded as open source

ps： The QR code is generally a picture, so our main program should be C/S or B/S application