using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
namespace UserCenter
{
  public class MySoapHeader :SoapHeader
  {
    public string UserName
    {
      get;
      set;
    }
    public string PWD
    {
      get;
      set;
    }
  }
  /// <summary>
  /// MyMath 的摘要说明
  /// </summary>
  [WebService(Namespace = "http://tempuri.org/")]
  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
  [System.ComponentModel.ToolboxItem(false)]
  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。
  // [System.Web.Script.Services.ScriptService]
  public class MyMath : System.Web.Services.WebService
  {
    public MySoapHeader sHeader;
    [WebMethod]
    public string HelloWorld()
    {
      return "Hello World";
    }
    [WebMethod]
    [SoapHeader("sHeader")]
    public string add(int x, int y)
    {
      if (sHeader.UserName == "test" && sHeader.PWD == "test")
      {
        return (x + y).ToString();
      }
      else
      {
        return null;
      }
    }
  }
}

using System;

using System.Collections.Generic;

using System.Linq;

using System.Web;

using System.Web.Services;

using System.Web.Services.Protocols;

namespace XMLClass1.class15.content

{

  [AttributeUsage(AttributeTargets.Method)]

  public class MyExtensionAttribute : SoapExtensionAttribute

  {

    int _priority = 1;

    public override int Priority

    {

      get { return _priority; }

      set { _priority = value; }

    }

    public override Type ExtensionType

    {

      get { return typeof(MyExtension); }

    }

  }

  public class MyExtension : SoapExtension

  {

    //这个override的方法会被调用四次

    //分别是SoapMessageStage BeforeSerialize,AfterSerialize,BeforeDeserialize,AfterDeserialize

    public override void ProcessMessage(SoapMessage message)

    {

      if (message.Stage == SoapMessageStage.AfterDeserialize)//反序列化之后处理

      {

        bool check = false;

        foreach (SoapHeader header in message.Headers)

        {

          if (header is MySoapHeader)

          {

            MySoapHeader myHeader = (MySoapHeader)header;

            if (myHeader.Name == "admin" || myHeader.PassWord == "admin")

            {

              check = true;

              break;

            }

          }

        }

        if (!check)

          throw new SoapHeaderException("认证失败", SoapException.ClientFaultCode);

      }

    }

    public override Object GetInitializer(Type type)

    {

      return GetType();
       }

    public override Object GetInitializer(LogicalMethodInfo info, SoapExtensionAttribute attribute)

    {

      return null;

    }

    public override void Initialize(Object initializer)

    {

    }

  }

  public class MySoapHeader : SoapHeader

  {

    string _name;

    string _passWord;

    public string Name

    {

      get { return _name; }

      set { _name = value; }

    }

    public string PassWord

    {

      get { return _passWord; }

      set { _passWord = value; }

    }

  }

  /// <summary>

  /// headersoap2 的摘要说明

  /// </summary>

  [WebService(Namespace = http://tempuri.org/)]

  [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]

  [System.ComponentModel.ToolboxItem(false)]

  // 若要允许使用 ASP.NET AJAX 从脚本中调用此 Web 服务，请取消对下行的注释。

  // [System.Web.Script.Services.ScriptService]

  public class headersoap2 : System.Web.Services.WebService

  {

     public MySoapHeader header;

    [WebMethod]

    [MyExtensionAttribute]

    [SoapHeader("header", Direction = SoapHeaderDirection.In)]

    public string CheckHeader()

    {

      //业务逻辑.

      return "Something done";

    }

  }
}