/// 
    /// 调用此函数后使此两种图片合并，类似相册，有个    /// 背景图，中间贴自己的目标图片    /// 
    /// 粘贴的源图片    /// 粘贴的目标图片    public static System.Drawing.Image CombinImage(string sourceImg, string destImg, string filename, string wxImg, string text_wx)    {        System.Drawing.Image imgBack = System.Drawing.Image.FromFile(sourceImg);     //相框图片         //System.Drawing.Image img = System.Drawing.Image.FromFile(destImg);        //照片图片         //if (img == null)        //{
    //二维码合并            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();            qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;            qrCodeEncoder.QRCodeScale = 4;//可以调节二维码的大小            qrCodeEncoder.QRCodeVersion = 8;            qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;            //System.Drawing.Image image = qrCodeEncoder.Encode("4408810820 深圳－广州 小江");            System.Drawing.Image img = qrCodeEncoder.Encode(destImg);               // }          //从指定的System.Drawing.Image创建新的System.Drawing.Graphics               Graphics g = Graphics.FromImage(imgBack);        // g.DrawImage(imgBack, 0, 0, 148, 124);      // g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);        //g.FillRectangle(System.Drawing.Brushes.Black, 16, 16, (int)112 + 2, ((int)73 + 2));//相片四周刷一层黑色边框          //从网络获取图片转为byte        WebClient my = new WebClient();        byte[] mybyte;        mybyte = my.DownloadData(wxImg);         //将byte流转为图片        MemoryStream ms1 = new MemoryStream(mybyte);        Image img2 = Image.FromStream(ms1);          //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, 185, 552, 131, 131);//写入二维码        g.DrawImage(img2, 0, 0, 131, 131);//写入图标        g.DrawString(text_wx, new Font(FontFamily.GenericMonospace, 14f), Brushes.White, new PointF(10, 20));//写入文字         GC.Collect();          //加LOGO和微信名称                //img = System.Drawing.Image.FromFile("http://www.baidu.com/img/baidu_jgylogo3.gif");        //照片图片        //g.DrawImage(imgBack, 0, 0, 148, 124);      // g.DrawImage(imgBack, 0, 0, 相框宽, 相框高);        //g.FillRectangle(System.Drawing.Brushes.Black, 16, 16, (int)112 + 2, ((int)73 + 2));//相片四周刷一层黑色边框                        //GC.Collect();                        //输出文件流        System.IO.MemoryStream ms = new System.IO.MemoryStream();        imgBack.Save(ms, System.Drawing.Imaging.ImageFormat.Png);        BytToImg(ms.ToArray(), HttpContext.Current.Server.MapPath("/rcode_system/" + filename + ".png"));//保存成文件                //输出文件流        //System.Web.HttpContext.Current.Response.ClearContent();        //System.Web.HttpContext.Current.Response.ContentType = "image/png";        //System.Web.HttpContext.Current.Response.BinaryWrite(ms.ToArray());                imgBack.Dispose();        return imgBack;    }

转自：https://blog.csdn.net/prospertu/article/details/51393982