Here is my code:

private void ExtractToTempFolder(string sourcePath)
        {
            ZipArchive fileAsZip = new ZipArchive(new DiskFile(sourcePath));
            MemoryFolder folder = new MemoryFolder("MemoryDrive", @"\");
            fileAsZip.CopyFilesTo(folder, true, true);

            MemoryFolder subFolder = folder.GetFolder(@"path omitted here") as MemoryFolder;

            DiskFolder tempFolder = new DiskFolder(tempDirectory);
            subFolder.CopyFilesTo(tempFolder, true, true, new NameFilter("filter omitted here - but gets 8 files from the folder"));
        }

I am taking a ZIP file, and extracting out 8 files to a physical directory on my PC.

When this runs, it's like it doesn't release the memory.  So when I watch my app in Task Manager, MemUsage just keeps going up every time this method is called. 

Any suggestions?

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We investigated this further through an email thread with Hillarie.  We found that MemoryFolder and MemoryFile need to be erased after being done with them, and calling the Garbage Collector will release the memory.  The reason for this is that MemoryFolder and MemoryFile are implemented a bit like a file on disk, that it, if you set a reference to a DiskFile to null, the file will still exist on disk, you can reference it later in your application.  If you make a new MemoryFolder with the same name later in your application, the folder (and files in it) will be there.

Here is an example of what needs to be done :

static void MemoryFolderTest()
{
  MemoryFolder folder = new MemoryFolder( "MemoryDrive", "\\" );
  DiskFile file = new DiskFile( @"someFile" ); // in this case, a 3.89MB file

  for( int i = 0; i < 100; i++ )
  {
    file.CopyTo( folder.GetFile( i.ToString() ), true );
  }

  file = null;

  for( int i = 0; i < 100; i++ )
  {
    folder.GetFile( i.ToString() ).Delete();
  }

  folder = null;

  GC.Collect();
}