C# 根据字符串生成二维码

1.先下载NuGet包(ZXing.Net)

2.新建控制器及编写后台代码

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Drawing.Imaging;
using System.IO;
using System.Linq;
using System.Web;
using System.Web.Mvc;
using ZXing;
using ZXing.QrCode;

namespace WebApplication1.Controllers
{
    public class StrController : Controller
    {
        // GET: Str
        public ActionResult Index()
        {
            return View();
        }
        /// 

        /// 生成二维码方法
        /// 
        /// 输入的字符串
        /// 二维码宽度
        /// 二维码高度
        /// 
        public string QRcode(string text, string width, string height)
        {
            string Response = "";
            try
            {
                BarcodeWriter writer = new BarcodeWriter();
                writer.Format = BarcodeFormat.QR_CODE;
                QrCodeEncodingOptions options = new QrCodeEncodingOptions();
                options.DisableECI = true;
                //设置内容编码
                options.CharacterSet = "UTF-8";
                //将传来的值赋给二维码的宽度和高度
                options.Width = Convert.ToInt32(width);
                options.Height = Convert.ToInt32(height);
                //设置二维码的边距,单位不是固定像素
                options.Margin = 1;
                writer.Options = options;

                Bitmap map = writer.Write(text);
                string di = text + DateTime.Now.ToString("yyyyMMddHHmmss") + ".png";
                //二维码会显示在桌面(你也想显示在桌面的话,要改一下路径)
                string path = Path.Combine("C:\\Users\\zhulin\\Desktop", di);
                map.Save(path, ImageFormat.Png);
                map.Dispose();
                Response = "二维码生成成功！";
            }
            catch (Exception)
            {
                Response = "二维码生成失败！";
            }
            return Response;
        }
    }
}

3.前端

@{
    Layout = null;
}





    "viewport" content="width=device-width" />
    
    "~/Scripts/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet" />
    
    
    



    
"margin-top:20px;margin-left:20px;">
        
高度:"text" style="width:60px;height:32px;border:1px solid #66b1ff;margin-left:3px;" id="wd" />"margin-left:10px;">宽度:"text" style="width:60px;height:32px;border:1px solid #66b1ff;margin-left:3px;" id="hg" />
        "text" style="width:200px;height:32px;border:1px solid #66b1ff;" id="tx" placeholder="请输入字符串..." />"button" class="btn btn-info" id="btn" style="margin-left:5px;margin-top:-1px;height:33px;">提交
    

4.效果：