将多张图片和文字合成一张图片

/// <summary>
    /// 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
    /// </summary>
    /// <param name="sourceImg">粘贴的源图片</param>
    /// <param name="destImg">粘贴的目标图片</param>
    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