pdf增加水印

/// <summary>

        /// 为PDF添加水印或背景图片

        /// </summary>

        /// <param name="strSourceFilePath">源文件路径</param>

        /// <param name="strTargetFilePath">目标文件路径</param>

        /// <param name="strWaterMarkPicPath">水印图片路径</param>

        /// <param name="strTargetFileTmpPath">目标临时文件</param>

        /// <returns>添加结果</returns>

        public static bool AddWaterMarkForPdf(string strSourceFilePath, string strTargetFilePath, string strWaterMarkPicPath, FileInfo TargetFileTmp)

        {

            bool blnRt = false;

            PdfFileInfo pdf = new PdfFileInfo(strSourceFilePath);

            if (! pdf.BePdfFile)

            {

                throw  new ApplicationException("源文件不是有效的PDF文件");

            }

            //开始处理

            int intPageNums = pdf.NumberofPages;

            PdfFileStamp fileStamp = null;

            try

            {

                int intNumber = ;

                int intCount = (int)Math.Ceiling(intPageNums / (decimal.Parse(intNumber.ToString())));

                for (int j = ; j < intCount; j++)

                {

                    fileStamp = new PdfFileStamp(strSourceFilePath, strTargetFilePath);

                    for (int i = ; i <= intNumber; i++)

                    {

                        if (j * intNumber + i > intPageNums)

                        {

                            break;

                        }

                        Stamp stamp = new Stamp();

                        if (!String.IsNullOrEmpty(strWaterMarkPicPath))

                        {

                            stamp.BindImage(strWaterMarkPicPath);

                        }

                        stamp.IsBackground = true;

                        stamp.PageNumber = j * intNumber + i;

                        stamp.SetImageSize(PageSize.A4.Height, PageSize.A4.Width);

                        fileStamp.AddStamp(stamp);

                    }

                    fileStamp.Close();

                    TargetFileTmp.Delete();

                    File.Copy(strTargetFilePath, TargetFileTmp.FullName);

                    strSourceFilePath = TargetFileTmp.FullName;

                }

                blnRt = true;

            }

            catch (Exception ex)

            {

                throw ex;

            }

            return blnRt;

        }

具体代码

注意，给ＰＤＦ增加水晶报表，当页码过多时会报错，或卡死。为了防止这种情况，我们要分多次对ＰＤＦ进行增加水印。

如第一次加600页，保存关闭当前文件，再拿加过水印的文件进行再追加水印，这样这就不会了错了。