what's the best way to pass XML document as a remoting argument?

by **Keith Langer** » Thu, 26 Oct 2006 10:57:06 GMT

Hi,

I'm looking for the most efficient way to pass an XML document into a
remoting call.  I know that I can return an XMLDocument from a remoting
call, but passing one as an argument causes errors.  If I pass the XML
as a string, I believe that all tags will get URL-encoded, making the
document much bigger.  I supposed that I could base64 encode it.  Is
there a way to just pass it as straight binary data?

thanks,
Keith Langer

by **Gter Prossliner** » Thu, 26 Oct 2006 19:08:45 GMT

Hello!


Because the XML-Document is not derived by MarshalByRef object and not 
serializable you cannot pass it through remoting directly.


This depends on the kind of formatter you use. A Xml / Soap Formatter MAY 
encode the XML-String. A binary formatter does not.


This depends on the formatter. The Binary Formatter can do it (others can 
also do it, but the data may be encoded in most cases (depends on the 
implementation)).


If you have to deal with really "big" xml-files, and you can control both 
the client and the server, it may be an option for you to use some kind of 
compression (like GZipStream). Because XML is very redundant GZIP will 
compress the data very well.

Example:

// compress
XmlDocument doc = ...;
MemoryStream ms = new MemoryStream();
GZipStream zipStream = new GZipStream(ms, CompressionMode.Compress);
doc.Save(zipStream);
zipStream.Close();

byte[] compressed = ms.ToArray();
ms.Close();


//decompress
MemoryStream ms = new MemoryStream(data);
GZipStream zipStream = new GZipStream(ms, CompressionMode.Decompress);
doc.Load(zipStream);
zipStream.Close();
ms.Close();


OK?


GP

by **Keith Langer** » Thu, 26 Oct 2006 22:11:19 GMT

Gunter,

The documents are about 100K, so there's probably not a lot of need for
compression (I'd be trading bandwidth for CPU time to compress and
deflate).  I tested one of these documents and found that URLEncode
expands it by about 50%, as opposed to 33% for base64.  That's probably
not a huge deal.  What exactly happens with binary encoding, and how
does it affect the document size?  Do you have a good example of using
binary encoding?

Is there a way to see exactly what gets passed via the remoting call
and determine its size?

thanks,
Keith

by **Gter Prossliner** » Sat, 28 Oct 2006 16:59:11 GMT

Hi Keith!


The question is: What restricts you more? The CPU or the bandwidth?


URLEncode from what? Binary data??? URL Encoding a string should not expand 
the size by 50%.


What do you meen with "Binary Encoding"? BinaryFormatting?

This depends on the way remoting is configured for you application / object. 
When you use a TcpChannel, the binary-Formatter is choosen by default.


You can use tools like etherreal for this. If you want to determinate the 
size of a single object, you can serialize the instance into Memory 
(BinarySerializer / MemoryStream), and check out how much memory is used.



GP

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