C# iText split PDF C# 拆分PDF

 nuget install itext7

using itext.kernel.pdf;

using system.linq;
using system.text;
using system.threading.tasks; 
using system.configuration; 
using itext.kernel.utils;
using itext.kernel.pdf;
using system.io;
using system.web.ui;
using system.windows.forms; 

class program
    {      
        static void main(string[] args)
        {
            ultimateitextsplitpdf();
            console.readline();
        }

        static void ultimateitextsplitpdf()
        {
            string rawpdffile = @"d:\c\c\consoleapp1\ejatt.pdf";
            program objprovider = new program();
            objprovider.pdfsplitexample(rawpdffile);
        }      

        void pdfsplitexample(string rawpdffile)
        {
            if(!file.exists(rawpdffile))
            {
                return;
            }
            mcspdfsplitter mcspdfsplitterprovider;
            //generated physical split pdf files by getnextpdfwriter of mcspdfsplitter
            using (var pdfdoc = new pdfdocument(new pdfreader(rawpdffile)))
            {
                mcspdfsplitterprovider = new mcspdfsplitter(pdfdoc, rawpdffile);                 
                var splitpdfdocs = mcspdfsplitterprovider.splitbypagecount(1);
                foreach (var splitpdf in splitpdfdocs)
                {
                    splitpdf.close();
                }               
            }

            mcspdfsplitterprovider.splitpdfnameslist.foreach(x =>
            {
                if (file.exists(x))
                {
                    byte[] pdfbyte = file.readallbytes(x);
                    console.writeline($"before delete,name {x},length {pdfbyte.length}");
                    file.delete(x);
                }
            });
        }
}

 

using itext.kernel.utils;
using system;
using system.collections.generic;

namespace consoleapp1
{
public class mcspdfsplitter : pdfsplitter
{
private int _pagenumber;
private string _rawpdffile;
public list<string> splitpdfnameslist = new list<string>();
public mcspdfsplitter(pdfdocument pdfdocument, string rawpdffile) : base(pdfdocument)
{
_rawpdffile = rawpdffile;
}

protected override pdfwriter getnextpdfwriter(pagerange documentpagerange)
{
_pagenumber++;
string splitpdffilename = _rawpdffile.substring(0,_rawpdffile.lastindexof(".pdf"))+ _pagenumber+"split" + guid.newguid().tostring().replace("-", "") + ".pdf";
splitpdfnameslist.add(splitpdffilename);
return new pdfwriter(splitpdffilename);
}
}
}