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Esta página es específica de
Microsoft Visual Studio 2005/.NET Framework 2.0

Hay además otras versiones disponibles para:
SoapExtension (Clase)
Clase base de las extensiones SOAP para los servicios Web XML creados mediante ASP.NET.

Espacio de nombres: System.Web.Services.Protocols
Ensamblado: System.Web.Services (en system.web.services.dll)

Visual Basic (Declaración)
Public MustInherit Class SoapExtension
Visual Basic (Uso)
Dim instance As SoapExtension
C#
public abstract class SoapExtension
C++
public ref class SoapExtension abstract
J#
public abstract class SoapExtension
JScript
public abstract class SoapExtension
XAML
No aplicable.

ASP.NET permite crear una infraestructura relacionada con SOAP mediante un mecanismo de extensibilidad. La arquitectura de extensiones SOAP de ASP.NET manipula una extensión que puede examinar o modificar un mensaje en fases específicas del procesamiento de mensajes en el cliente o en el servidor.

Las extensiones SOAP de ASP.NET se derivan de la clase SoapExtension. Los métodos GetInitializer y Initialize proporcionan mecanismos alternativos para inicializar la extensión SOAP y mejorar el rendimiento. ProcessMessage es la esencia de la mayoría de las extensiones SOAP, ya que se llama a este método en cada fase definida en SoapMessageStage, lo que permite que la extensión SOAP tenga el comportamiento que se espera de esa extensión SOAP específica. En el caso de las extensiones SOAP que necesitan modificar la solicitud SOAP o la respuesta SOAP, el método ChainStream proporciona una oportunidad para recibir los datos propuestos que se enviarán a través de la conexión.

La extensión SOAP TraceExtension siguiente envía la solicitud SOAP y la respuesta SOAP a un archivo especificado cuando se aplica a un método de servicios Web XML. Si se instala la siguiente extensión SOAP para que se ejecute con un servicio Web XML, la cuenta de usuario ASPNET debe tener permiso para escribir en el directorio donde se escribe el archivo de registro.

Visual Basic
Imports System
Imports System.Web.Services
Imports System.Web.Services.Protocols
Imports System.IO

' Define a SOAP Extension that traces the SOAP request and SOAP response
' for the XML Web service method the SOAP extension is applied to.
Public Class TraceExtension
    Inherits SoapExtension

    Private oldStream As Stream
    Private newStream As Stream
    Private m_filename As String

    ' Save the Stream representing the SOAP request or SOAP response into
    ' a local memory buffer.
    Public Overrides Function ChainStream(ByVal stream As Stream) As Stream
        oldStream = stream
        newStream = New MemoryStream()
        Return newStream
    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 Overloads Overrides Function GetInitializer(ByVal methodInfo As _
        LogicalMethodInfo, _
    ByVal attribute As SoapExtensionAttribute) As Object
        Return CType(attribute, TraceExtensionAttribute).Filename
    End Function

    ' The SOAP extension was configured to run using a configuration file
    ' instead of an attribute applied to a specific XML Web service
    ' method.  Return a file name based on the class implementing the Web
    ' Service's type.
    Public Overloads Overrides Function GetInitializer(ByVal WebServiceType As _
      Type) As Object
        ' Return a file name to log the trace information to, based on the
        ' type.
        Return "C:\" + WebServiceType.FullName + ".log"
    End Function

    ' Receive the file name stored by GetInitializer and store it in a
    ' member variable for this specific instance.
    Public Overrides Sub Initialize(ByVal initializer As Object)
        m_filename = CStr(initializer)
    End Sub

    ' If the SoapMessageStage is such that the SoapRequest or SoapResponse
    ' is still in the SOAP format to be sent or received over the network,
    ' save it out to file.
    Public Overrides Sub ProcessMessage(ByVal message As SoapMessage)
        Select Case message.Stage
            Case SoapMessageStage.BeforeSerialize
            Case SoapMessageStage.AfterSerialize
                WriteOutput(message)
            Case SoapMessageStage.BeforeDeserialize
                WriteInput(message)
            Case SoapMessageStage.AfterDeserialize
        End Select
    End Sub

    ' Write the SOAP message out to a file.
    Public Sub WriteOutput(ByVal message As SoapMessage)
        newStream.Position = 0
        Dim fs As New FileStream(m_filename, FileMode.Append, _
                                 FileAccess.Write)
        Dim w As New StreamWriter(fs)
        w.WriteLine("-----Response at " + DateTime.Now.ToString())
        w.Flush()
        Copy(newStream, fs)
        w.Close()
        newStream.Position = 0
        Copy(newStream, oldStream)
    End Sub

    ' Write the SOAP message out to a file.
    Public Sub WriteInput(ByVal message As SoapMessage)
        Copy(oldStream, newStream)
        Dim fs As New FileStream(m_filename, FileMode.Append, _
                                 FileAccess.Write)
        Dim w As New StreamWriter(fs)

        w.WriteLine("----- Request at " + DateTime.Now.ToString())
        w.Flush()
        newStream.Position = 0
        Copy(newStream, fs)
        w.Close()
        newStream.Position = 0
    End Sub

    Sub Copy(ByVal fromStream As Stream, ByVal toStream As Stream)
        Dim reader As New StreamReader(fromStream)
        Dim writer As New StreamWriter(toStream)
        writer.WriteLine(reader.ReadToEnd())
        writer.Flush()
    End Sub
End Class

' Create a SoapExtensionAttribute for our SOAP Extension that can be
' applied to an XML Web service method.
<AttributeUsage(AttributeTargets.Method)> _
Public Class TraceExtensionAttribute
    Inherits SoapExtensionAttribute

    Private m_filename As String = "c:\log.txt"
    Private m_priority As Integer

    Public Overrides ReadOnly Property ExtensionType() As Type
        Get
            Return GetType(TraceExtension)
        End Get
    End Property

    Public Overrides Property Priority() As Integer
        Get
            Return m_priority
        End Get
        Set(ByVal Value As Integer)
            m_priority = value
        End Set
    End Property

    Public Property Filename() As String
        Get
            Return m_filename
        End Get
        Set(ByVal Value As String)
            m_filename = value
        End Set
    End Property
End Class
C#
using System;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.IO;
using System.Net;

    // Define a SOAP Extension that traces the SOAP request and SOAP
    // response for the XML Web service method the SOAP extension is
    // applied to.

    public class TraceExtension : SoapExtension 
    {
        Stream oldStream;
        Stream newStream;
        string filename;

        // Save the Stream representing the SOAP request or SOAP response into
        // a local memory buffer.
        public override Stream ChainStream( Stream stream )
        {
            oldStream = stream;
            newStream = new MemoryStream();
            return newStream;
        }

        // 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 SOAP extension was configured to run using a configuration file
        // instead of an attribute applied to a specific XML Web service
        // method.
        public override object GetInitializer(Type WebServiceType) 
        {
            // Return a file name to log the trace information to, based on the
            // type.
            return "C:\\" + WebServiceType.FullName + ".log";    
        }

        // Receive the file name stored by GetInitializer and store it in a
        // member variable for this specific instance.
        public override void Initialize(object initializer) 
        {
            filename = (string) initializer;
        }

        //  If the SoapMessageStage is such that the SoapRequest or
        //  SoapResponse is still in the SOAP format to be sent or received,
        //  save it out to a file.
        public override void ProcessMessage(SoapMessage message) 
        {
            switch (message.Stage) 
            {
                case SoapMessageStage.BeforeSerialize:
                    break;
                case SoapMessageStage.AfterSerialize:
                    WriteOutput(message);
                    break;
                case SoapMessageStage.BeforeDeserialize:
                    WriteInput(message);
                    break;
                case SoapMessageStage.AfterDeserialize:
                    break;
            }
        }

        public void WriteOutput(SoapMessage message)
        {
            newStream.Position = 0;
            FileStream fs = new FileStream(filename, FileMode.Append,
                FileAccess.Write);
            StreamWriter w = new StreamWriter(fs);

            string soapString = (message is SoapServerMessage) ? "SoapResponse" : "SoapRequest";
            w.WriteLine("-----" + soapString + " at " + DateTime.Now);
            w.Flush();
            Copy(newStream, fs);
            w.Close();
            newStream.Position = 0;
            Copy(newStream, oldStream);
        }

        public void WriteInput(SoapMessage message)
        {
            Copy(oldStream, newStream);
            FileStream fs = new FileStream(filename, FileMode.Append,
                FileAccess.Write);
            StreamWriter w = new StreamWriter(fs);

            string soapString = (message is SoapServerMessage) ?
                "SoapRequest" : "SoapResponse";
            w.WriteLine("-----" + soapString + 
                " at " + DateTime.Now);
            w.Flush();
            newStream.Position = 0;
            Copy(newStream, fs);
            w.Close();
            newStream.Position = 0;
        }

        void Copy(Stream from, Stream to) 
        {
            TextReader reader = new StreamReader(from);
            TextWriter writer = new StreamWriter(to);
            writer.WriteLine(reader.ReadToEnd());
            writer.Flush();
        }
    }

    // Create a SoapExtensionAttribute for the SOAP Extension that can be
    // applied to an XML Web service method.
    [AttributeUsage(AttributeTargets.Method)]
    public class TraceExtensionAttribute : SoapExtensionAttribute 
    {

        private string filename = "c:\\log.txt";
        private int priority;

        public override Type ExtensionType 
        {
            get { return typeof(TraceExtension); }
        }

        public override int Priority 
        {
            get { return priority; }
            set { priority = value; }
        }

        public string Filename 
        {
            get 
            {
                return filename;
            }
            set 
            {
                filename = value;
            }
        }
    }
C++
#using <System.dll>
#using <System.Web.Services.dll>

using namespace System;
using namespace System::Web::Services;
using namespace System::Web::Services::Protocols;
using namespace System::IO;
using namespace System::Net;

ref class TraceExtension;

// Create a SoapExtensionAttribute for the SOAP Extension that can be
// applied to an XML Web service method.
[AttributeUsage(AttributeTargets::Method)]
public ref class TraceExtensionAttribute: public SoapExtensionAttribute
{
private:
   String^ filename;
   int priority;

public:
   TraceExtensionAttribute()
      : filename( "c:\\log.txt" )
   {}

   property Type^ ExtensionType 
   {
      virtual Type^ get() override
      {
         return TraceExtension::typeid;
      }
   }

   property int Priority 
   {
      virtual int get() override
      {
         return priority;
      }
      virtual void set( int value ) override
      {
         priority = value;
      }
   }

   property String^ Filename 
   {
      String^ get()
      {
         return filename;
      }
      void set( String^ value )
      {
         filename = value;
      }
   }
};

// Define a SOAP Extension that traces the SOAP request and SOAP
// response for the XML Web service method the SOAP extension is
// applied to.
public ref class TraceExtension: public SoapExtension
{
private:
   Stream^ oldStream;
   Stream^ newStream;
   String^ filename;

public:
   // Save the Stream representing the SOAP request or SOAP response into
   // a local memory buffer.
   virtual Stream^ ChainStream( Stream^ stream ) override
   {
      oldStream = stream;
      newStream = gcnew MemoryStream;
      return newStream;
   }

   // 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. 
   virtual Object^ GetInitializer( LogicalMethodInfo^ /*methodInfo*/, SoapExtensionAttribute^ attribute ) override
   {
      return (dynamic_cast<TraceExtensionAttribute^>(attribute))->Filename;
   }

   // The SOAP extension was configured to run using a configuration file
   // instead of an attribute applied to a specific XML Web service
   // method.
   virtual Object^ GetInitializer( Type^ WebServiceType ) override
   {
      // Return a file name to log the trace information to, based on the
      // type.
      return String::Format( "C:\\{0}.log", WebServiceType->FullName );
   }

   // Receive the file name stored by GetInitializer and store it in a
   // member variable for this specific instance.
   virtual void Initialize( Object^ initializer ) override
   {
      filename = dynamic_cast<String^>(initializer);
   }

   //  If the SoapMessageStage is such that the SoapRequest or
   //  SoapResponse is still in the SOAP format to be sent or received,
   //  save it out to a file.
   virtual void ProcessMessage( SoapMessage^ message ) override
   {
      switch ( message->Stage )
      {
         case SoapMessageStage::BeforeSerialize:
            break;
         case SoapMessageStage::AfterSerialize:
            WriteOutput( message );
            break;
         case SoapMessageStage::BeforeDeserialize:
            WriteInput( message );
            break;
         case SoapMessageStage::AfterDeserialize:
            break;
      }
   }

   void WriteOutput( SoapMessage^ message )
   {
      newStream->Position = 0;
      FileStream^ fs = gcnew FileStream( filename, FileMode::Append,
         FileAccess::Write );
      StreamWriter^ w = gcnew StreamWriter( fs );

      String^ soapString = ( (SoapServerMessage^)( message ) ) ?
         (String^)"SoapResponse" : "SoapRequest";
      w->WriteLine( "-----{0} at {1}", soapString, DateTime::Now );
      w->Flush();
      Copy( newStream, fs );
      w->Close();
      newStream->Position = 0;
      Copy( newStream, oldStream );
   }

   void WriteInput( SoapMessage^ message )
   {
      Copy( oldStream, newStream );
      FileStream^ fs = gcnew FileStream( filename,FileMode::Append,FileAccess::Write );
      StreamWriter^ w = gcnew StreamWriter( fs );
      String^ soapString = (dynamic_cast<SoapServerMessage^>(message)) ? (String^)"SoapRequest" : "SoapResponse";
      w->WriteLine( "-----{0} at {1}", soapString, DateTime::Now );
      w->Flush();
      newStream->Position = 0;
      Copy( newStream, fs );
      w->Close();
      newStream->Position = 0;
   }

   void Copy( Stream^ from, Stream^ to )
   {
      TextReader^ reader = gcnew StreamReader( from );
      TextWriter^ writer = gcnew StreamWriter( to );
      writer->WriteLine( reader->ReadToEnd() );
      writer->Flush();
   }
};
J#
import System.*;
import System.Web.Services.*;
import System.Web.Services.Protocols.*;
import System.IO.*;
import System.Net.*;

// Define a SOAP Extension that traces the SOAP request and SOAP
// response for the XML Web service method the SOAP extension is
// applied to.
public class TraceExtension extends SoapExtension
{
    private Stream oldStream;
    private Stream newStream;
    private String filename;

    // Save the Stream representing the SOAP request or SOAP response into
    // a local memory buffer.
    public Stream ChainStream(Stream stream)
    {
        oldStream = stream;
        newStream = new MemoryStream();
        return newStream;
    } //ChainStream

    // 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 Object GetInitializer(LogicalMethodInfo methodInfo, 
        SoapExtensionAttribute attribute)
    {
        return ((TraceExtensionAttribute)(attribute)).get_Filename();
    } //GetInitializer

    // The SOAP extension was configured to run using a configuration file
    // instead of an attribute applied to a specific XML Web service
    // method.
    public Object GetInitializer(Type WebServiceType)
    {
        // Return a file name to log the trace information to, based on the
        // type.
        return "C:\\" + WebServiceType.get_FullName() + ".log";
    } //GetInitializer

    // Receive the file name stored by GetInitializer and store it in a
    // member variable for this specific instance.
    public void Initialize(Object initializer)
    {
        filename = (String)(initializer);
    } //Initialize

    //  If the SoapMessageStage is such that the SoapRequest or
    //  SoapResponse is still in the SOAP format to be sent or received,
    //  save it out to a file.
    public void ProcessMessage(SoapMessage message)
    {
        switch (message.get_Stage()) {
            case SoapMessageStage.BeforeSerialize :
                break;

            case SoapMessageStage.AfterSerialize :
                WriteOutput(message);
                break;

            case SoapMessageStage.BeforeDeserialize :
                WriteInput(message);
                break;

            case SoapMessageStage.AfterDeserialize :
                break;
       }
    } //ProcessMessage

    public void WriteOutput(SoapMessage message)
    {
        newStream.set_Position(0);

        FileStream fs = 
            new FileStream(filename, FileMode.Append, FileAccess.Write);
        StreamWriter w = new StreamWriter(fs);
        String soapString = (message instanceof SoapServerMessage) ? 
                            "SoapResponse" : "SoapRequest";

        w.WriteLine(("-----" + soapString + " at " + DateTime.get_Now()));
        w.Flush();
        Copy(newStream, fs);
        w.Close();
        newStream.set_Position(0);
        Copy(newStream, oldStream);
    } //WriteOutput

    public void WriteInput(SoapMessage message)
    {
        Copy(oldStream, newStream);

        FileStream fs = 
            new FileStream(filename, FileMode.Append, FileAccess.Write);
        StreamWriter w = new StreamWriter(fs);
        String soapString = (message instanceof SoapServerMessage) ? 
                            "SoapRequest" : "SoapResponse";

        w.WriteLine(("-----" + soapString + " at " + DateTime.get_Now()));
        w.Flush();
        newStream.set_Position(0);
        Copy(newStream, fs);
        w.Close();
        newStream.set_Position(0);
    } //WriteInput

    void Copy(Stream from, Stream to)
    {
        TextReader reader = new StreamReader(from);
        TextWriter writer = new StreamWriter(to);

        writer.WriteLine(reader.ReadToEnd());
        writer.Flush();
    } //Copy
} //TraceExtension


// Create a SoapExtensionAttribute for the SOAP Extension that can be
// applied to an XML Web service method.

/** @attribute AttributeUsage(AttributeTargets.Method)
 */
public class TraceExtensionAttribute extends SoapExtensionAttribute
{
    private String filename = "c:\\log.txt";
    private int priority;

    public Type get_ExtensionType()
    {
        return TraceExtension.class.ToType();
    } //get_ExtensionType

    public int get_Priority()
    {
        return priority;
    } //get_Priority

    public void set_Priority(int value)
    {
        priority = value;
    } //set_Priority

    public String get_Filename()
    {
        return filename;
    } //get_Filename

    public void set_Filename(String value)
    {
        filename = value;
    } //set_Filename
} //TraceExtensionAttribute
System.Object
  System.Web.Services.Protocols.SoapExtension
Los miembros estáticos públicos (Shared en Visual Basic) de este tipo son seguros para la ejecución de subprocesos. No se garantiza que los miembros de instancias sean seguros para la ejecución de subprocesos.

Windows 98, Windows 2000 Service Pack 4, Windows CE, Windows Millennium, Windows Mobile para Pocket PC, Windows Mobile para Smartphone, Windows Server 2003, Windows XP Media Center, Windows XP Professional x64, Windows XP SP2, Windows XP Starter

Microsoft .NET Framework 3.0 es compatible con Windows Vista, Microsoft Windows XP SP2 y Windows Server 2003 SP1.

.NET Framework

Compatible con: 3.0, 2.0, 1.1, 1.0

.NET Compact Framework

Compatible con: 2.0, 1.0
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