Untitled

DotNetZip creating zip from subset of other zip
//All files have the same basefilename/
 string basefilename = Path.GetFileNameWithoutExtension(entries[0].FileName);
 MemoryStream memstream = new MemoryStream();
 ZipFile zip = new ZipFile();
 foreach (var entry in entries)
 {
    string newFileName = basefilename + Path.GetExtension(entry.FileName);
    zip.AddEntry(newFileName, entry.OpenReader());
 }

 zip.Save(memstream);

 //this will later go in an file-io handler class.
 FileStream outstream = File.OpenWrite(@"c:files"+basefilename+ ".zip");
 memstream.WriteTo(outstream);
 outstream.Flush();
 outstream.Close();

using (var zip = ZipFile.Read("c:\dir\path\to\existing\zipfile.zip"))
{
    foreach (var name in namesToRemove) // IEnumerable<String>
    {
       zip[name].Remove();
    }
    zip.Save("c:\path\to\new\Archive.zip");
}

using (var orig = ZipFile.Read("C:\whatever\OriginalArchive.zip"))
{
    using (var smaller = new ZipFile())
    {
      foreach (var name in entriesToKeep)
      {
         var ms = new MemoryStream();
         orig[name].Extract(ms); // extract into stream
         ms.Seek(0,SeekOrigin.Begin);
         smaller.AddEntry(name,ms);
      }
      smaller.Save("C:\location\of\SmallerZip.zip");
    }
}

using(ZipFile original = ZipFile.Read("C:\path.to\original\Archive.zip"),
      smaller = new ZipFile())
{
    foreach (var name in entriesToKeep)
    {
        zip.AddEntry(zipEntryName,
                     (name) => original[name].OpenReader(),
                     null);
    }

    smaller.Save("C:\path.to\smaller\Archive.zip");
}

using (ZipFile zip = new ZipFile())
{
   zip.CompressionLevel = CompressionLevel.BestCompression;
   foreach (var entry in entries)
   {
      try
      {
         string newFileName = basefilename + Path.GetExtension(entry.FileName);
         zip.AddFile(newFileName, "");
      }
      catch (Exception) { }
   }
   zip.Save("c:\files\"+basefilename+ ".zip");
}

string basefilename = Path.GetFileNameWithoutExtension(entries[0].FileName);
ZipFile zip = new ZipFile();
foreach (var entry in entries){
      CrcCalculatorStream reader = entry.OpenReader();
      MemoryStream memstream = new MemoryStream();
      reader.CopyTo(memstream);
      byte[] bytes = memstream.ToArray();
      string newFileName = basefilename + Path.GetExtension(entry.FileName);
      zip.AddEntry(newFileName, bytes);
}

zip.Save(@"c:files" + basefilename + ".zip");