SoapHeader 传递用户身份验证信息

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[WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [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 Service1 : System.Web.Services.WebService
    {
        public MyServiceClassHeader msch;

        static    string Convert(string str)
        {
            MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
            return BitConverter.ToString(MD5.ComputeHash(Encoding.GetEncoding("gb2312").GetBytes(str))).Replace("-", "");
        }

        static string GetMD5Hash(string str)
        {
            string temp = Convert(str).Substring(8, 16).ToLower();
            return Convert(temp).Substring(8, 16).ToLower();
        }

        [WebMethod]
        [SoapHeader("msch", Direction = SoapHeaderDirection.In)]
        public string Login()
        {
            if (msch != null)
            {
                if (msch.MustUnderstand)
                {
                    string UserName =msch.UsN;
                    string PassWord =msch.PaW;
                    if (UserName == GetMD5Hash("wenziyan") || PassWord == GetMD5Hash("811208"))
                    {
                        return "登录成功!";
                    }
                    else
                    {
                        return "登录失败!";
                    }
                }
                else
                {
                    return "消息头不是必读的!";
                }
            }
            else
            {
                return "没有头消息!";
            }
        }

}

    public class MyServiceClassHeader : SoapHeader
    {
        public string UsN;
        public string PaW;
    };

public class Class1
    {
        //
        //TODO: 在此处添加构造函数逻辑

        //
      public static    string Convert(string str)
        {
            MD5CryptoServiceProvider MD5 = new MD5CryptoServiceProvider();
            return BitConverter.ToString(MD5.ComputeHash(Encoding.GetEncoding("gb2312").GetBytes(str))).Replace("-", "");
        }

      public static string GetMD5Hash(string str)
        {
            string temp = Convert(str).Substring(8, 16).ToLower();
            return Convert(temp).Substring(8, 16).ToLower();
        }
    }

protected void Page_Load(object sender, EventArgs e)
    {
       localhost.MyServiceClassHeader MyHeaer = new localhost.MyServiceClassHeader();
        localhost.Service1 service = new localhost.Service1();
        string userName = "wenziyan";
        String unHash=Class1.GetMD5Hash(userName);

string passWord = "811208";

String pwHash = Class1.GetMD5Hash(passWord);

        MyHeaer.UsN = userName;
        MyHeaer.PaW = passWord;
        MyHeaer.MustUnderstand = true;
        service.MyServiceClassHeaderValue = MyHeaer;

        string flag = service.Login();
        Response.Write(flag);
    }