Very large file upload using WS(E)

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Claus Konrad - 02 Dec 2005 08:26 GMT

Hi

I'm presented with the issue of uploading 250+MB files to a server, preferably using a webservice.To do this - I'm currently making use of DimeAttachments, as this allows for large file attachment. I'm currently experiencing a file limit imposed by the system (clientside ?) of 128MB in a single attachment. Even the Attachment.ChunkSize = 5MB.

Now - before I am starting to roll my own "protocol", sending the file in parts manually; I would like to hear of experiences in this field.

/Claus Konrad

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n33470 - 02 Dec 2005 17:30 GMT

Claus,

Before you roll your own code, look into the new file transfer protocol
built in to WSE 3.0. It uses a new optimized file transfer technique
called MTOM, this is not the same as the DIME attachment process in
previous versions of WSE. I'm not sure if there are file size
limitations, but it's worth investigating. There is a quickstart
example installed with WSE 3.0 that goes over the implementation
details.

I've used DimeAttachments in previous versions of WSE, and the MTOM
design is much more elegant, by a long shot! In a nutshell, whenever
you use a webmethod paramater, or return value of byte[], you are
executing a file transfer under the covers.

--steve

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Julie Lerman - 03 Dec 2005 15:17 GMT

not only that, but the transfer is much more efficient - much smaller on the
wire.

You can also combine this with file compression. Pre-VS2005, I have been
using Xceed's Streaming Compression library to compress data returned by a
web service. VS2005 now has file compression in the System.IO namespace.

julie lerman

> Claus,
>
[quoted text clipped - 12 lines]
>
> --steve

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Very large file upload using WS(E)

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