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How to: Initialize Cached Data When a SOAP Extension is Configured

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This topic is specific to a legacy technology. XML Web services and XML Web service clients should now be created using Windows Communication Foundation.

The following code example initializes a cached piece of data in the GetInitializer method, based on how the SOAP extension is eventually configured. If the SOAP extension is configured using an attribute, in this case a TraceExtensionAttribute, the file name specified in the attribute is cached. If the SOAP extension is configured using a configuration file, the cached file name is computed, based on the type of the Web service.

Example

' When the SOAP extension is accessed for the first time, the XML
' Web service method it is applied to is accessed to store the file
' name passed in, using the corresponding SoapExtensionAttribute.
Public Overloads Overrides Function GetInitializer(methodInfo As _
   LogicalMethodInfo, attribute As SoapExtensionAttribute) As Object 
 Return CType(attribute, TraceExtensionAttribute).Filename
End Function

' The extension was configured to run using a configuration file 
' instead of an attribute applied to a specific Web service method.
' Return a file name, based on the class implementing the XML Web 
' service's type.

Public Overloads Overrides Function GetInitializer(WebServiceType As _
   Type) As Object
  ' Return a file name to log the trace information, based on the type.
  Return "C:\" + WebServiceType.FullName + ".log"    
End Function

// When the SOAP extension is accessed for the first time, the XML
// Web service method it is applied to is accessed to store the file
// name passed in, using the corresponding SoapExtensionAttribute.
public override object GetInitializer(LogicalMethodInfo methodInfo,
   SoapExtensionAttribute attribute) 
{
   return ((TraceExtensionAttribute) attribute).Filename;
}
// The extension was configured to run using a configuration file instead of
// an attribute applied to a specific Web service method.
public override object GetInitializer(Type WebServiceType) 
{
// Return a file name to log the trace information, based on the type.
   return "C:\\" + WebServiceType.FullName + ".log";}

See Also

Tasks

Walkthrough: Altering the SOAP Message Using SOAP Extensions