SoapUnknownHeader Class
Assembly: System.Web.Services (in system.web.services.dll)
A SOAP client might invoke an XML Web service with additional data beyond the required parameters in the form of a SOAP header. An XML Web service created using ASP.NET or an XML Web service client can view any SOAP headers it did not know about at the time the XML Web service was written by applying a SoapHeaderAttribute with a MemberName property of either an array of SoapHeader, SoapHeader, SoapUnknownHeader or an array of SoapUnknownHeader to the XML Web service method. Specifying a Type of SoapUnknownHeader, allows the XML Web service to view the contents of the SOAP header in the form of an XmlElement.
The MyWebService XML Web service accepts and processes the MyHeader SOAP header sent with any calls to the MyWebMethod XML Web service method. Additionally, MyWebMethod receives any SOAP headers other than the MyHeader SOAP header.
<%@ WebService Language="VB" Class="MyWebService"%> Imports System.Web.Services Imports System.Web.Services.Protocols Imports System.Xml Imports System ' Define a SOAP header by deriving from the SoapHeader base class. Public Class MyHeader Inherits SoapHeader Public MyValue As String End Class Public Class MyWebService Public myHeader As MyHeader ' Receive all SOAP headers besides the MyHeader SOAP header. Public unknownHeaders() As SoapUnknownHeader 'Receive any SOAP headers other than MyHeader. <WebMethod, _ SoapHeader("myHeader", Direction := SoapHeaderDirection.InOut), _ SoapHeader("unknownHeaders")> _ Public Function MyWebMethod() As String Dim unknownHeaderAttributes As String = String.Empty ' Set myHeader.MyValue to some value. Dim header As SoapUnknownHeader For Each header In unknownHeaders ' Perform some processing on the header. Dim attribute As XmlAttribute For Each attribute In header.Element.Attributes unknownHeaderAttributes &= attribute.Name & ":" & _ attribute.Value & ";" Next attribute ' For those headers that cannot be ' processed, set the DidUnderstand property to false. header.DidUnderstand = False Next header Return unknownHeaderAttributes End Function End Class
System.Web.Services.Protocols.SoapHeader
System.Web.Services.Protocols.SoapUnknownHeader
Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition
The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.