C#iTextSharp字符串是否在pdf中

引用using iTextSharp.text.pdf;

using iTextSharp.text.pdf.parser;

/// <summary>
         /// 判断字符串是否在PDF中

         /// </summary>

         /// <param name="fileName">PDF文件路径</param>

         /// <param name="key">字符串</param>

         /// <returns></returns>

         public static bool IsExistKeys(string fileName, string key)

         {

             bool exist = false;

             //打开一个pdf文件，并创建一个读取该文件的PdfReader

             PdfReader reader = new PdfReader(fileName);

             PdfReaderContentParser parser = new PdfReaderContentParser(reader);

             ITextExtractionStrategy strategy;

             for (int i = 1; i <= reader.NumberOfPages; i++)

             {

                 strategy = parser.ProcessContent<SimpleTextExtractionStrategy>(i, new SimpleTextExtractionStrategy());

                 exist =  strategy.GetResultantText().IndexOf(key)!= -1;

                     if (exist)

                     {

                         break;

                     }                    

             }

             return exist;

         }