c#生成包含白邊和圖片的二維碼

原文章鏈接忘記了。。。

1.引用nuget包：Install-Package ThoughtWorks.QRCode

2.可選，如果需要中間帶入圖片，保存在項目中，在CreateQRCode()方法中傳入該圖片的相對路徑

3.直接調用下面的CreateQRCode方法

該圖為帶圖片實例，圖片為內網鏈接，僅做展示使用

using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Web;
using ThoughtWorks.QRCode.Codec;

namespace Common
{
    public class QRCodeHelper
    {
        /// <summary>
        ///  生成二維碼
        /// </summary>
        /// <param name="url">掃描后跳轉url</param>
        /// <param name="insertImgUrl">中間圖片url（相對路徑），為空則不帶圖片</param>
        /// <returns></returns>
        public static Bitmap CreateQRCode(string url,string insertImgUrl=null)
        {
            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();
            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
            qrCodeEncoder.QRCodeScale = 4;
            qrCodeEncoder.QRCodeVersion = 8;
            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
            Image image = qrCodeEncoder.Encode(url);
            if (string.IsNullOrEmpty(insertImgUrl))
            {
                return AddFrame(image);
            }
            //插入圖片路徑
            string path = HttpContext.Current.Server.MapPath(insertImgUrl);
            var bitmap = AddFrame(CombinImage(image, path), 5);
            return bitmap;
        }

        /// <summary>
        /// 在圖片四周加入白邊
        /// </summary>
        /// <param name="Img">圖片</param>
        /// <param name="Margin">白邊的高度，單位是像素</param>
        /// <returns>Bitmap</returns>
        private static Bitmap AddFrame(Image Img, int Margin=6)
        {
            //位圖寬高
            int width = Img.Width + Margin;
            int height = Img.Height + Margin;
            Bitmap BitmapResult = new Bitmap(width, height);
            Graphics Grp = Graphics.FromImage(BitmapResult);
            SolidBrush b = new SolidBrush(Color.White);//這里修改顏色
            Grp.FillRectangle(b, 0, 0, width, height);
            System.Drawing.Rectangle Rec = new System.Drawing.Rectangle(0, 0, Img.Width, Img.Height);
            //向矩形框內填充Img
            Grp.DrawImage(Img, Margin/2, Margin/2 , Rec, GraphicsUnit.Pixel);
            //返回位圖文件
            Grp.Dispose();
            GC.Collect();
            return BitmapResult;
        }

        /// <summary>    
        /// 調用此函數后使此兩種圖片合並，類似相冊，有個    
        /// 背景圖，中間貼自己的目標圖片    
        /// </summary>    
        /// <param name="imgBack">粘貼的源圖片</param>    
        /// <param name="destImg">粘貼的目標圖片</param>    
        private static Image CombinImage(Image imgBack, string destImg)
        {
            Image img = Image.FromFile(destImg);        //照片圖片      
            if (img.Height != 65 || img.Width != 65)
            {
                img = KiResizeImage(img, 65, 65, 0);
            }
            Graphics g = Graphics.FromImage(imgBack);

            g.DrawImage(imgBack, 0, 0, imgBack.Width, imgBack.Height);      //g.DrawImage(imgBack, 0, 0, 相框寬, 相框高);     

            //g.FillRectangle(System.Drawing.Brushes.White, imgBack.Width / 2 - img.Width / 2 - 1, imgBack.Width / 2 - img.Width / 2 - 1,1,1);//相片四周刷一層黑色邊框    

            //g.DrawImage(img, 照片與相框的左邊距, 照片與相框的上邊距, 照片寬, 照片高);    

            g.DrawImage(img, imgBack.Width / 2 - img.Width / 2, imgBack.Width / 2 - img.Width / 2, img.Width, img.Height);
            GC.Collect();
            return imgBack;
        }


        /// <summary>    
        /// Resize圖片    
        /// </summary>    
        /// <param name="bmp">原始Bitmap</param>    
        /// <param name="newW">新的寬度</param>    
        /// <param name="newH">新的高度</param>    
        /// <param name="Mode">保留着，暫時未用</param>    
        /// <returns>處理以后的圖片</returns>    
        private static Image KiResizeImage(Image bmp, int newW, int newH, int Mode)
        {
            try
            {
                Image b = new Bitmap(newW, newH);
                Graphics g = Graphics.FromImage(b);
                // 插值算法的質量    
                g.InterpolationMode = InterpolationMode.HighQualityBicubic;
                g.DrawImage(bmp, new Rectangle(0, 0, newW, newH), new Rectangle(0, 0, bmp.Width, bmp.Height), GraphicsUnit.Pixel);
                g.Dispose();
                return b;
            }
            catch
            {
                return null;
            }
        }
    }
}