WCF Chunking / Streaming

Question

I\'m using WCF and want to upload a large file from the client to the server. I have investigated and decided to follow the chunking approach outlined at http://msdn.microsoft.c

Answer 1

You could make your service session-ful and have an initialization method in the contract with the IsInitiating property set to true. Something like:

[OperationContract(IsInitiating = true)]
void InitializeUploadService(string filename);

[OperationContract(IsOneWay = true, IsInitiating = false)]
[ChunkingBehavior(ChunkingAppliesTo.InMessage)]
void UploadStream(Stream stream);

I have never tried it with streaming services but it should basically make WCF enforce that InitializeUploadService is always called before UploadStream.

More documentation can be found here: http://msdn.microsoft.com/en-us/library/system.servicemodel.description.operationdescription.isinitiating.aspx

Answer 2

Setting up the maxItemsInObjectGraph in the Client side and Server side worked for me.

(Dont forget the client side.) http://social.msdn.microsoft.com/Forums/en/wcf/thread/0af69654-2d89-44f3-857a-583b57844ca5

Answer 3

I would look at MessageContracts and add those values as message headers to your object. This should allow you to pass the stream and any values related to the stream as message headers.

Answer 4

This article explains how to use the MessageHeader attribute to force things to be passed in the header, and therefore not count as a parameter. So, instead of passing a stream and other meta data, create a class that has the attribute MessageContract and mark all of the meta data as a MessageHeader. Then, mark the stream as a MessageBodyMember (which the article incorrect calls "MessageBody"). Have your UploadStream method take a single parameter whose type is that of the MessageContract class you've just created. I've done this successfully, but I haven't done it in tandem with chunking. Good luck.