pdf - iText FileStream overwirtes -

i in process of putting code merge pdf's based on file name prefix. have below code grabs filename , doesn't merge, overwrites. believe problem filestream placement, if move out of current location, can't filename. suggestions? thanks.

static void createmergedpdfs()      {         string srcdir = "c:/pdfin/";         string resultpdf = "c:/pdfout/";         {             var files = system.io.directory.getfiles(srcdir);             string prevfilename = null;              int = 1;             foreach (string file in files)             {                 string filename = left(path.getfilename(file), 8);                 using (filestream stream = new filestream(resultpdf  + filename + ".pdf", filemode.create))                 {                      if (prevfilename == null || filename == prevfilename)                     {                         document pdfdoc = new document(pagesize.a4);                         pdfcopy pdf = new pdfcopy(pdfdoc, stream);                          pdfdoc.open();                         {                             pdf.adddocument(new pdfreader(file));                             i++;                         }                         if (pdfdoc != null)                             pdfdoc.close();                         console.writeline("merges done!");                     }                  }             }         }     } } 

}

the behavior describing consistent code. creating loop in incorrect way.

try this:

static void createmergedpdfs()      {         string srcdir = "c:/pdfin/";         string resultpdf = "c:/pdfout/merged.pdf";         filestream stream = new filestream(resultpdf, filemode.create);         document pdfdoc = new document(pagesize.a4);         pdfcopy pdf = new pdfcopy(pdfdoc, stream);          pdfdoc.open();         var files = system.io.directory.getfiles(srcdir);         foreach (string file in files)         {             pdf.adddocument(new pdfreader(file));         }         pdfdoc.close();         console.writeline("merges done!");     } } 

that makes more sense, doesn't it?

if want group files based on prefix, should read answer question group files in directory based on prefix

in answer question, assumed prefix , rest of filename separated - character. instance 1-abc.pdf , 1-xyz.pdf have prefix 1 whereas 2-abc.pdf , 2-xyz.pdf have prefix 2. in case, it's not clear how you'd determine prefix, it's easy list of files, sort them , make groups of files based on whatever algorithm want determine prefix.