iTextSharp.dll/Aspose.Cells.dll/ThoughtWorks.QRCode.dll

https://blog.csdn.net/jiangyu912/article/details/4969376 

iTextSharp.dll是个开源的用于生成pdf的类库了  项目中我们只需要引用就可以了,可以用来合并，拆分PDF,也可以用来添加水印

添加水印：https://zhuanlan.zhihu.com/p/380877588

https://baike.baidu.com/item/Aspose.Cells/6880387?fr=aladdin

Aspose.Cells是一款功能强大的Excel文档处理和转换控件，开发人员和客户电脑无需安装Microsoft Excel也能在应用程序中实现类似Excel的强大数据管理功能，支持所有Excel格式类型的操作，在没有Microsoft Excel的环境下，用户也可为其应用程序嵌入类似Excel的强大数据管理功能。Aspose.Cells可以对每一个具体的数据，表格和格式进行管理，在各个层面导入图像，应用复杂的计算公式，并将应用程序中的表格保存为各种格式等。

 

http://t.zoukankan.com/macT-p-11395234.html

利用ThoughtWorks.QRCode生成二维码

一、项目添加ThoughtWorks.QRCode.dll和System.Drawing.dll的引用

二、创建二维码公共处理类（QRCodeHandler.cs）

/// <summary>
    /// 二维码处理类
    /// </summary>
    public class QRCodeHandler
    {
        /// <summary>
        /// 创建二维码
        /// </summary>
        /// <param name="QRString">二维码字符串</param>
        /// <param name="QRCodeEncodeMode">二维码编码(Byte、AlphaNumeric、Numeric)</param>
        /// <param name="QRCodeScale">二维码尺寸(Version为0时，1：26x26，每加1宽和高各加25</param>
        /// <param name="QRCodeVersion">二维码密集度0-40</param>
        /// <param name="QRCodeErrorCorrect">二维码纠错能力(L：7% M：15% Q：25% H：30%)</param>
        /// <param name="filePath">保存路径</param>
        /// <param name="hasLogo">是否有logo(logo尺寸50x50，QRCodeScale>=5，QRCodeErrorCorrect为H级)</param>
        /// <param name="logoFilePath">logo路径</param>
        /// <returns></returns>
        public bool CreateQRCode(string QRString, string QRCodeEncodeMode, short QRCodeScale, int QRCodeVersion, string QRCodeErrorCorrect, string filePath, bool hasLogo, string logoFilePath)
        {
            bool result = true;

            QRCodeEncoder qrCodeEncoder = new QRCodeEncoder();

            switch (QRCodeEncodeMode)
            {
                case "Byte":
                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                    break;
                case "AlphaNumeric":
                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.ALPHA_NUMERIC;
                    break;
                case "Numeric":
                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.NUMERIC;
                    break;
                default:
                    qrCodeEncoder.QRCodeEncodeMode = QRCodeEncoder.ENCODE_MODE.BYTE;
                    break;
            }

            qrCodeEncoder.QRCodeScale = QRCodeScale;
            qrCodeEncoder.QRCodeVersion = QRCodeVersion;

            switch (QRCodeErrorCorrect)
            {
                case "L":
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.L;
                    break;
                case "M":
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.M;
                    break;
                case "Q":
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.Q;
                    break;
                case "H":
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
                    break;
                default:
                    qrCodeEncoder.QRCodeErrorCorrect = QRCodeEncoder.ERROR_CORRECTION.H;
                    break;
            }

            try
            {
                Image image = qrCodeEncoder.Encode(QRString, System.Text.Encoding.UTF8);
                System.IO.FileStream fs = new System.IO.FileStream(filePath, System.IO.FileMode.OpenOrCreate, System.IO.FileAccess.Write);
                image.Save(fs, System.Drawing.Imaging.ImageFormat.Jpeg);
                fs.Close();

                if (hasLogo)
                {
                    Image copyImage = System.Drawing.Image.FromFile(logoFilePath);
                    Graphics g = Graphics.FromImage(image);
                    int x = image.Width / 2 - copyImage.Width / 2;
                    int y = image.Height / 2 - copyImage.Height / 2;
                    g.DrawImage(copyImage, new Rectangle(x, y, copyImage.Width, copyImage.Height), 0, 0, copyImage.Width, copyImage.Height, GraphicsUnit.Pixel);
                    g.Dispose();

                    image.Save(filePath);
                    copyImage.Dispose();
                }
                image.Dispose();

            }
            catch (Exception ex)
            {
                result = false;
            }
            return result;
        }

    }

调用

 QRCodeHandler qr = new QRCodeHandler();
            string path = Path.Combine("C:\", "Down\");
            string qrString = "http://blog.csdn.net/pan_junbiao";                         //二维码字符串
            string logoFilePath = path + "myLogo.jpg";                                    //Logo路径50*50
            string filePath = path + "myCode.jpg";                                        //二维码文件名
            qr.CreateQRCode(qrString, "Byte", 5, 0, "H", filePath, true, logoFilePath);   //生成