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.NET FrameworkReading and writing Zip files


The ZipFile class lives in the System.IO.Compression namespace. It can be used to read from, and write to Zip files.


  • You can also use a MemoryStream instead of a FileStream.

  • Exceptions

ArgumentExceptionThe stream has already been closed, or the capabilities of the stream does not match the mode (eg: trying to write to a read only stream)
ArgumentNullExceptioninput stream is null
ArgumentOutOfRangeExceptionmode has an invalid value
InvalidDataExceptionSee list below

When a InvalidDataException is thrown, it can have 3 causes:

  • The contents of the stream could not be interpreted as a zip archive
  • mode is Update and an entry is missing from the archive or is corrupt and cannot be read
  • mode is Update and an entry is too large to fit into memory

All information has been taken from this MSDN page