c# - How can I unzip a file to a .NET memory stream? -

i have files (from 3rd parties) being ftp'd directory on our server. download them , process them 'x' minutes. works great.

now, of files .zip files. means can't process them. need unzip them first.

ftp has no concept of zip/unzipping - i'll need grab zip file, unzip it, process it.

looking @ msdn zip api, there seems no way can unzip memory stream?

so way this...

1. unzip file (what directory? need -very- temp location ...)
2. read file contents
3. delete file.

note: contents of file small - 4k <-> 1000k.

zip compression support built in:

using system.io; using system.io.compression; // ^^^ requires reference system.io.compression.dll static class program {     const string path = ...     static void main()     {         using(var file = file.openread(path))         using(var zip = new ziparchive(file, ziparchivemode.read))         {             foreach(var entry in zip.entries)             {                 using(var stream = entry.open())                 {                     // whatever want stream                     // ...                 }             }         }     } } 

normally should avoid copying stream - use "as is", however, if absolutely need it in memorystream, do:

using(var ms = new memorystream()) {     stream.copyto(ms);     ms.position = 0; // rewind     // ms }