因为同事说在调用webservice的时候会弹出身份验证的窗口，直接调用会返回401，原因是站点部署的时候设置了身份验证（账号名称自己配置）。因而在调用的时候需要加入身份验证的凭证。

   

   至于如何获取身份验证的凭据呢？可以使用微软提供的NetworkCredential（命名空间是System.Net）,代码如下。

   

using System;using System.Net;using webserviceSync.helloWebservice;namespace webserviceSync{    public partial class WebForm1 : System.Web.UI.Page    {        protected void Page_Load(object sender, EventArgs e)        {            MySoapHeader my = new MySoapHeader();            my.UserName = "";            Response.Write(webserviceClient.HelloWorld(my));        }        /// 
        /// 获取网络凭证        /// 
        /// 
             public static NetworkCredential GetCredential()        {            //return new NetworkCredential("Administrator", "888888", "192.168.2.58");//简单直接            return (NetworkCredential)CredentialCache.DefaultCredentials;//需要本地设置凭据        }        /// 
        /// 验证凭证是否能通过        /// 
        /// 
             public static bool IsVerifySucess()        {            string url = "http://192.168.2.58:7777/WebService.asmx?wsdl";            WebResponse webResponse = null;            try            {                WebRequest webRequest = WebRequest.Create(url);                webRequest.Credentials = GetCredential();                webRequest.Timeout = 15000;                webResponse = webRequest.GetResponse();            }            catch (Exception ex)            { throw ex; }            return true;        }        /// 
        /// 属性        /// 
        private static WebServiceSoapClient _webserviceClient = null;        /// 
        /// webservice服务        /// 
        public static WebServiceSoapClient webserviceClient        {            get            {                if (_webserviceClient == null)                {                    bool isSucess = IsVerifySucess();                    if (isSucess == true)                    {                        _webserviceClient = new WebServiceSoapClient();                        _webserviceClient.ClientCredentials.Windows.ClientCredential = GetCredential();//这属性........                    }                }                return _webserviceClient;            }        }    }}

如何在本地设置凭据可以参考