MessageHeader Methode WriteHeader

Question

Hi I tried to add a custom Header to a client message: Dim newMessage As Message = buffer.CreateMessage() newMessage.Headers.RemoveAt(0) Dim memStream As New MemoryStream() Dim xdw As XmlDictionaryWriter = XmlDictionaryWriter.CreateBinaryWriter(memStream) xdw.WriteStartElement(wsse Security http://docs.oasis-open.org/wss/2004/01/oasis-200401-wss-wssecurity-secext-1.0.xsd ) xdw.WriteStartElement(wsc SecurityContextToken http://schemas.xmlsoap.org/ws/2005/02/sc ) xdw.WriteStartElement(wsc Identifier http://schemas.xmlsoap.org/ws/2005/02/sc ) xdw.WriteString(Mytext Entry) xdw.WriteEndElement() xdw.WriteEndElement() xdw.WriteEndElement() xdw.Flush() Dim MyHeader As MessageHeader MyHeader.WriteHeader(xdw request.Version) newMessage.Headers.Add(MyHeader) request = newMessage I got the Methode from a Microsoft page: http://msdn.microsoft.com/en-us/library/ms195423(v=VS.90).aspx But it is not working it throws an exception: Object reference not set to an instance of an object. at line: MyHeader.WriteHeader(xdw request.Version) When I used the MessageHeader.CreateHeader(Name) For both versions I am happy to get an answer for solving that problem Lothar I could not include Prefix for the Namespace

info · Answer

Hi Suthish when I derive from class MessageHeader I get this: Public Class MyHeaderclass Inherits System.ServiceModel.Channels. MessageHeader Public Sub New ( ByVal messageVersion As System.ServiceModel.Channels. MessageVersion ) Mybase.New() End Sub Public Overrides ReadOnly Property Name As String Get End Get End Property Public Overrides ReadOnly Property [Namespace] As String Get End Get End Property Protected Overrides Sub OnWriteHeaderContents( ByVal writer As System.Xml. XmlDictionaryWriter  ByVal messageVersion As System.ServiceModel.Channels. MessageVersion ) End Sub End Class I have to fill the readOnly Properties and so it will overwrite everything I put in my HeaderClass in the Code BeforeSendRequest. If you have any idea i would be happy Regards Lothar

Suthish Nair · Answer

The topic in the thread was something new to me. I was wondering why above code not working and showing incorrect namespaces. That why i asked to post the whole (Hole ) page.

info · Answer

Hello Suthish what information do you want? Hole page? I will get the Error on line: MyHeader.WriteHeader(xdw request.Version) The other version of creating a header is when you use Dim MyHeader As MessageHeader MyHeader = MessageHeader.CreateHeader(MyNewHeader     RELAY>) But I can not add prefixes here which are necessary for the request! So please tell me what should I provide you! Thanks for any information Lothar

info · Answer

Dear Sam Hoobs you did nothing except bitching around. So please stop answering my question if you don't understand. I never asked for examble code I asked if somebody could explain why Microsoft is displaing a example an the Web which doesn't work. And by the way to derive from that clas does not work. Try it and learn! I am a member in this forum since 2003 and I have enough experience in .Net. Kind Regards Lothar

Sam Hobbs · Answer

Suthish eventhough info does not appreciate it I did spend time trying to help in the previous thread. I managed to get the additional information that resulted in this thread. I got to the point you are at now. The MessageHeader Class for C# is an abstract class and for VB it is  MustInherit . So what info needs to do is to create a class derived from MessageHeader correct? I assume that there are articles explaining that but info wants to use the sample code without learning how to use it. Even if someone was to provide more sample code for info info will need more and more and more until people stop helping info or info learns the language and reads the material.

Suthish Nair · Answer

can you post whole page with namespaces.

info · Answer

This is a protected new You can not use it like this!

Suthish Nair · Answer

change and try... Dim MyHeader As New MessageHeader