Webservice返回SoapHeader

Webservice在请求中加入自定义的SoapHeader，比较常用的场景是在SoapHeader中携带用户登陆信息，由服务端进行身份验证。今天遇到一个需求，除了在请求时要携带SoapHeader外，在返回值中也要返回一个结构不同的SoapHeader对象。简单点，在参数中增加ref  outHeader，也可以实现需求。但是客户的WebService接口并不是这样设计的。于是找到下面的处理方法：

定义两个SoapHeader类：

    public class InSoapHeader : SoapHeader
    {

        public InSoapHeader()
        {

        }

        public string UserName { get; set; }

        public string Ip { get; set; }

        public string Token { get; set; }
    }

    public class OutSoapHeader : SoapHeader
    {

        public OutSoapHeader()
        {

        }

        public string Ip { get; set; }
    }

编写WebService服务：

    [WebService(Namespace = "http://tempuri.org/")]
    [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
    [System.ComponentModel.ToolboxItem(false)]
    public class WebService1 : System.Web.Services.WebService
    {
        private InSoapHeader _inSoapHeader;

        public InSoapHeader InSoapHeader
        {
            get { return _inSoapHeader; }
            set { _inSoapHeader = value; }
        }

        private OutSoapHeader _outSoapHeader=new OutSoapHeader();//给定初始值，否则在返回时会null

        public OutSoapHeader OutSoapHeader
        {
            get { return _outSoapHeader; }
            set { _outSoapHeader = value; }
        }

        [WebMethod]
        [SoapHeader("InSoapHeader", Direction = SoapHeaderDirection.In)]
        [SoapHeader("OutSoapHeader", Direction = SoapHeaderDirection.Out)]
        public string HelloWorld()
        {
            OutSoapHeader.Ip = "123123";
            return string.Empty;
        }
    }

客户端调用程序：

        private void btnCall_Click(object sender, EventArgs e)
        {
            ServiceReference1.WebService1SoapClient cli = new ServiceReference1.WebService1SoapClient();
            ServiceReference1.InSoapHeader inheader = new ServiceReference1.InSoapHeader() { Ip="127.0.0.1",Token="N",UserName="N"};
            ServiceReference1.OutSoapHeader outheader;

            string result = string.Empty;
            outheader=cli.HelloWorld(inheader,out result);//这时候返回值自动放到了参数中，和普通的方法还是有区别的。

            System.Diagnostics.Debug.WriteLine(outheader.Ip);
            //输出123123
        }