MessageInterceptor Example - Message references problem

MessageInterceptor Example - Message references problem by pcibraro

Closed

as Other

Type:	Bug
ID:	202762
Opened:	9/14/2006 7:37:13 AM
Access Restriction:	Public

Workaround(s)

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User(s) can reproduce this bug

When a IChannelMessageInspector reads the received message and returns a reference to a new message, the InspectingChannelListener class still uses the old reference (An invalid one). As a result, WCF throws an exception when it tries to deserialize the request from that invalid reference.

This is for the september 2006 RC.

Details (expand)

.NET Framework 3.0 Community Technology Preview June 2006

English

Windows XP Professional

US English

1. Create a new IChannelMessageInspector that changes the message reference to a new message. (The code for this message inspector is attached)
2. Configure the sample to use this new message inspector.

1. WCF throws an exception when it tries to read the message (Old reference)

1. WCF reads the new message, and executes the service.

1 attachments

The sample provided to drop the messages works fine, but, if I develop a new message inspector to read the message, WCF throws an exception. Take a look to this code,

public class ErrorServerInspector : IChannelMessageInspector
    {
        public ErrorServerInspector() { }

        public void OnSend(ref Message msg)
        {
            // do nothing
        }

        public void OnReceive(ref Message msg)
        {
            System.Xml.XmlDocument document = new System.Xml.XmlDocument();
            document.Load(msg.GetReaderAtBodyContents());

            // Create new message
            System.Xml.XmlNodeReader xmlReader = new System.Xml.XmlNodeReader(document.FirstChild);

            Message newMsg = Message.CreateMessage(msg.Version, null, xmlReader);

            // Preserve the headers of the original message
            newMsg.Headers.CopyHeadersFrom(msg);

            foreach (string propertyKey in msg.Properties.Keys)
                newMsg.Properties.Add(propertyKey, msg.Properties[propertyKey]);

            // Close the original message and return new message
            msg.Close();

            msg = newMsg;
        }

        public IChannelMessageInspector Clone()
        {
            return new ErrorServerInspector();
        }
    }

This sample does not work, because I am changing the message reference received as parameter.