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Editorial Team
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Asked: 2026-06-09T12:35:02+00:00

I have a streamed WCF service. In one operation, I receive a file, for

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I have a streamed WCF service. In one operation, I receive a file, for upload purposes.
If I try to do something like this

request.FileContent.Length

Then I receive an OperationNotSupported exception. That’s Ok.
But how could I get the file size without actually transfering it entirely?
I know I could send this information along with the call, as a Header, but I don’t want to go this way.

If WCF is able to limit the request size trough maxReceiveMessageSize. How can I use the same information to check the message/stream size?

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1 Answer

  1. Editorial Team

    In general, you can’t know the size of a byte stream without reading it all and counting the bytes, unless there is data at the start of the stream which tells you how many bytes there are in the entire stream, or some other out-of-band way to communicate the length of the stream, such as in the WCF message headers. You will have to go with the Header approach if you want to know the size without reading the stream.

    The WCF maxReceiveMessageSize works by counting the bytes as they are received and throwing an exception if the limit is exceeded… it doesn’t know the stream length either, and can’t pre-emptively prevent the message being received without first reading the maximum allowed number of bytes.

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