原文章链接忘记了。。。
1.引用nuget包：Install-Package ThoughtWorks.QRCode
2.可选，如果需要中间带入图片，生存在项目中，在CreateQRCode()要领中传入该图片的相对路径
3.直接挪用下面的CreateQRCode要领
using System; using System.Drawing; using System.Drawing.Drawing2D; using System.Web; using ThoughtWorks.QRCode.Codec; namespace Common { public class QRCodeHelper { /// <summary> /// 生成二维码 /// </summary> /// <param>扫描后跳转url</param> /// <param>中间图片url（相对路径），为空则不带图片</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); } //插入图片路径 string path = HttpContext.Current.Server.MapPath(insertImgUrl); var bitmap = AddFrame(CombinImage(image, path), 5); return bitmap; } /// <summary> /// 在图片四周插手白边 /// </summary> /// <param>图片</param> /// <param>白边的高度，单位是像素</param> /// <returns>Bitmap</returns> private static Bitmap AddFrame(Image Img, int Margin=6) { //位图宽高 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);//这里改削颜色 Grp.FillRectangle(b, 0, 0, width, height); System.Drawing.Rectangle Rec = new System.Drawing.Rectangle(0, 0, Img.Width, Img.Height); //向矩形框内填充Img Grp.DrawImage(Img, Margin/2, Margin/2 , Rec, GraphicsUnit.Pixel); //返回位图文件 Grp.Dispose(); GC.Collect(); return BitmapResult; } /// <summary> /// 挪用此函数后使此两种图片合并，类似相册，有个 /// 配景图，中间贴本身的方针图片 /// </summary> /// <param>粘贴的源图片</param> /// <param>粘贴的方针图片</param> private static Image CombinImage(Image imgBack, string destImg) { Image img = Image.FromFile(destImg); //照片图片 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, 相框宽, 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);//相片四周刷一层黑色边框 //g.DrawImage(img, 照片与相框的左边距, 照片与相框的上边距, 照片宽, 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图片 /// </summary> /// <param>原始Bitmap</param> /// <param>新的宽度</param> /// <param>新的高度</param> /// <param>保存着，，暂时未用</param> /// <returns>措置惩罚惩罚以后的图片</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); // 插值算法的质量 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; } } } }