Wcf upload file stream

When you have a large amount of data to transfer, the streaming transfer mode in WCF is a feasible alternative to the default behavior of buffering and processing messages in memory in their entirety.

As mentioned earlier, enable streaming only for large messages with text or binary content if the data cannot be segmented, if the message must be delivered in a timely fashion, or if the data is not yet fully available when the transfer is initiated.

Digital signatures for the message body cannot be performed because they require computing a hash over the entire message contents. With streaming, the content is not fully available when the message headers are constructed and sent and, therefore, a digital signature cannot be computed.

Encryption depends on digital signatures to verify that the data has been reconstructed correctly. Reliable sessions must buffer sent messages on the client for redelivery if a message gets lost in transfer and must hold messages on the service before handing them to the service implementation to preserve message order in case messages are received out-of-sequence.

Because of these functional constraints, you can use only transport-level security options for streaming and you cannot turn on reliable sessions. Streaming is only available with the following system-defined bindings:. Because the underlying transports of NetTcpBinding and NetNamedPipeBinding have inherent reliable delivery and connection-based session support, unlike HTTP, these two bindings are only minimally affected by these constraints, in practice.

The Message Queuing transport only supports buffered data transfers with a constrained message size, while all other transports do not have any practical message size limit for the vast majority of scenarios. Streaming is also not available when using the Peer Channel transport, so is not available with the NetPeerTcpBinding. You may get unexpected behavior when streaming calls with a session-based binding.

All streaming calls are made through a single channel the datagram channel that does not support sessions even if the binding being used is configured to use sessions.

If multiple clients make streaming calls to the same service object over a session-based binding and the service object's concurrency mode is set to single and its instance context mode is set to PerSession, all calls must go through the datagram channel and so only one call is processed at a time. One or more clients may then time out. MaxConcurrentSessions has no effect in this case because there is only one "session" available.

Send and accept requests in streaming mode, and accept and return responses in buffered mode StreamedRequest. Send and accept requests in buffered mode, and accept and return responses in streamed mode StreamedResponse. Send and receive requests and responses in streamed mode in both directions. You can disable streaming by setting the transfer mode to Buffered , which is the default setting on all bindings.

The following code shows how to set the transfer mode in configuration. When you instantiate your binding in code, you must set the respective TransferMode property of the binding or the transport binding element if you are composing a custom binding to one of the previously mentioned values.

You can turn on streaming for requests and replies or for both directions independently at either side of the communicating parties without affecting functionality. However, you should always assume that the transferred data size is so significant that enabling streaming is justified on both endpoints of a communication link.

For cross-platform communication where one of the endpoints is not implemented with WCF, the ability to use streaming depends on the platform's streaming capabilities. Another rare exception might be a memory-consumption driven scenario where a client or service must minimize its working set and can only afford small buffer sizes.

To enable asynchronous streaming, add the DispatcherSynchronizationBehavior endpoint behavior to the service host and set its AsynchronousSendEnabled property to true. We have also added the capability of true asynchronous streaming on the send side. This improves scalability of the service in scenarios where it is streaming messages to multiple clients some of which are slow in reading possibly due to network congestion or are not reading at all.

In these scenarios we now do not block individual threads on the service per client. This ensures that the service is able to process many more clients thereby improving the scalability of the service. The programming model for streaming is straightforward.

For receiving streamed data, specify an operation contract that has a single Stream typed input parameter. For returning streamed data, return a Stream reference. The operation Echo in the preceding example receives and returns a stream and should therefore be used on a binding with Streamed. Create a free Team What is Teams?

Collectives on Stack Overflow. Learn more. Asked 5 years, 7 months ago. Active 5 years, 7 months ago. Viewed 6k times. ReadToEnd ; if recievedText! ShowDialog ; if opf. Open opf. FileName, FileMode. Open, FileAccess. The service on being called receives the file and then saves it at the destinationFilePath on the server. Create serviceUrl ; request. The DownloadFileFromRemoteLocation method first downloads file from the service and then stores the file in the path specified in downloadedFileSaveLocation.

Show "File could not be downloaded or saved. CreateDirectory fileInfo. The following are the prerequisites for the attached code to work: IIS should be installed. View All. Eklavya Gupta Updated date Sep 03, Next Recommended Reading.

Net Core 6. Create A. Understanding Thread Starvation in. NET Core Applications. The code is pretty straightforward. It reads the incoming stream and saves it to a file using familiar. NET code. If the upload succeeds the UploadSucceeded property is set to true, if it fails this property is set to false.

Start by opening the web. Next specify the directory in which the service should save the incoming files. Next up is the binding for the service. A couple of its properties need to be tweaked to fit the needs of the service, namely:.