WCF Message Size

Question

Is there any way to test the size of a message before it is sent back to the client? I'd like to handle the maximum message size quota on the service side of things.

Answer 1

You can write a custom MessageEncoder, use it on the service side, and check an encoded message size inside it's WriteMessage methods.

Follow this guide and override the methods in such a way:

public override ArraySegment<byte> WriteMessage(Message message, int maxMessageSize, BufferManager bufferManager, int messageOffset)
{
    var result = this.text.WriteMessage(message, maxMessageSize, bufferManager, messageOffset);

    // Encoded message check logic.
    Console.WriteLine("Message sent. Length=" + result.Count);

    return result;
}

public override void WriteMessage(Message message, Stream stream)
{
    var position = stream.Position;

    this.text.WriteMessage(message, stream);

    // Encoded message check logic.
    Console.WriteLine("Message sent. Length=" + (stream.Position - position));
}