C# 根据字符串生成二维码

曾经终败给现在 2023-08-17 16:55 18阅读 0赞

1.先下载NuGet包(ZXing.Net)

![1677460-20190730181610814-1947327301.png][]

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();
            }
            /// <summary>
            /// 生成二维码方法
            /// </summary>
            /// <param name="text">输入的字符串</param>
            /// <param name="width">二维码宽度</param>
            /// <param name="height">二维码高度</param>
            /// <returns></returns>
            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;
    }
    
    <!DOCTYPE html>
    
    <html>
    <head>
        <meta name="viewport" content="width=device-width" />
        <title>Index</title>
        <link href="~/Scripts/bootstrap-3.3.7-dist/css/bootstrap.min.css" rel="stylesheet" />
        <script src="~/Scripts/jquery-3.3.1.min.js"></script>
        <script src="~/Scripts/bootstrap-3.3.7-dist/js/bootstrap.min.js"></script>
        <script type="text/javascript">
            $(document).ready(function () {
                $("#btn").click(function () {
                    var w = $("#wd").val();
                    var h = $("#hg").val();
                    var text = $("#tx").val();
                    $.ajax({
                        url: "/Str/QRcode",
                        data: "text=" + text + "&width=" + w + "&height=" + h,
                        success: function (e) {
                            alert(e);
                        }
                    });
                });
            })
    
        </script>
    </head>
    <body>
    
        <div style="margin-top:20px;margin-left:20px;">
            <p>高度:<input type="text" style="width:60px;height:32px;border:1px solid #66b1ff;margin-left:3px;" id="wd" /><span style="margin-left:10px;">宽度:</span><input type="text" style="width:60px;height:32px;border:1px solid #66b1ff;margin-left:3px;" id="hg" /></p>
            <input type="text" style="width:200px;height:32px;border:1px solid #66b1ff;" id="tx" placeholder="请输入字符串..." /><button type="button" class="btn btn-info" id="btn" style="margin-left:5px;margin-top:-1px;height:33px;">提交</button>
        </div>
    </body>
    </html>

4.效果：

![1677460-20190730183421733-1754054196.jpg][]![1677460-20190730183439784-559330453.jpg][]

转载于:https://www.cnblogs.com/zhangnever/p/11271990.html

[1677460-20190730181610814-1947327301.png]: /images/20230809/d0f32b76bd17497e9c392986401c2ebf.png
[1677460-20190730183421733-1754054196.jpg]: https://img2018.cnblogs.com/blog/1677460/201907/1677460-20190730183421733-1754054196.jpg
[1677460-20190730183439784-559330453.jpg]: /images/20230809/3c4ca83b9c2b4ba99360e577fa52cf34.png