在将SOAP消息发送到.NET中的WebService之前获取它

public object AfterReceiveRequest(ref Message request, IClientChannel channel, InstanceContext instanceContext)
{
    // 获取SOAP消息
    MessageBuffer buffer = request.CreateBufferedCopy(Int32.MaxValue);
    Message msg = buffer.CreateMessage();
    string soapMessage = msg.ToString();

    // 对SOAP消息进行处理
    // ...

    // 将处理后的SOAP消息赋值给request
    request = buffer.CreateMessage();

    return null;
}

public void BeforeSendReply(ref Message reply, object correlationState)
{
    // 获取SOAP消息
    MessageBuffer buffer = reply.CreateBufferedCopy(Int32.MaxValue);
    Message msg = buffer.CreateMessage();
    string soapMessage = msg.ToString();

    // 对SOAP消息进行处理
    // ...

    // 将处理后的SOAP消息赋值给reply
    reply = buffer.CreateMessage();
}