Tuesday, March 18, 2008 9:22 AM
kolbis
This message cannot support the operation because it has been copied
This is an error message I got when I extended WCF with a client inspector.
The lifetime of a message only lasts for one use. Once you've looked at the contents of a message, or copied the contents somewhere, you can't read the message again.
This is a common problem encountered when people are trying to write a message inspector. Since you're expected to pass the message along after you're done inspecting it, it's quite likely that you'll need to make a new copy of the message. If you don't make a copy of the message, then the next person will have nothing to read.
This means that your message inspector code should look something like this:
public void BeforeSendRequest(ref System.ServiceModel.Channels.Message request, IClientChannel channel)
{
MessageBuffer buffer = request.CreateBufferedCopy(int.MaxValue);
// Do something with the copied message
reply = buffer.CreateMessage();
buffer.Close();
}
תגים:WCF
