记录一个.net平台下动态调用webservice的处理类(动态编辑请求soap信息)

首先这段代码也是从网上搜来的，自己改了改，现在做个记录吧

using System;using System.Web;using System.Xml;using System.Collections;using System.Net;using System.Text;using System.IO;using System.Xml.Serialization;namespace TestClient{    /// <summary>    /// 利用WebRequest/WebResponse进行WebService调用的类    /// </summary>    /// <remarks>    /// 作成者：cyf    /// </remarks>    public class WebServiceCaller    {        //缓存xmlNamespace，避免重复调用GetNamespace        private Hashtable XML_NAMESPACE = new Hashtable();        /// <summary>        /// 用户名        /// </summary>        private string ID;        /// <summary>        /// 密码        /// </summary>        private string PWD;        /// <summary>        /// 初始化        /// </summary>        /// <param name="strUserId"> 用户名</param>        /// <param name="strPwd"> 密码</param>        public WebServiceCaller(string strUserId, string strPwd)        {            this.ID = strUserId;            this.PWD = strPwd;        }        /// <summary>        /// 通过SOAP协议动态调用webservice         /// </summary>        /// <param name="url"> webservice地址</param>        /// <param name="methodName"> 调用方法名</param>        /// <param name="pars"> 参数表</param>        /// <returns> 结果集xml</returns>        public string QuerySoapWebService(String url, String methodName, Hashtable pars)        {            if (XML_NAMESPACE.ContainsKey(url))            {   // 名字空间在缓存中存在时，读取缓存，然后执行调用                return QuerySoapWebService(url, methodName, pars, XML_NAMESPACE[url].ToString());            }            else            {                // 名字空间不存在时直接从wsdl的请求中读取名字空间，然后执行调用                return QuerySoapWebService(url, methodName, pars, GetNamespace(url));            }        }        /// <summary>        /// 通过SOAP协议动态调用webservice          /// </summary>        /// <param name="url"> webservice地址</param>        /// <param name="methodName"> 调用方法名</param>        /// <param name="pars"> 参数表</param>        /// <param name="xmlNs"> 名字空间</param>        /// <returns> 结果集</returns>        private string QuerySoapWebService(String url, String methodName, Hashtable pars, string xmlNs)        {               XML_NAMESPACE[url] = xmlNs;//加入缓存，提高效率            // 获取请求对象            HttpWebRequest request = (HttpWebRequest)HttpWebRequest.Create(url);            // 设置请求head            request.Method = "POST";            request.ContentType = "text/xml; charset=utf-8";            request.Headers.Add("SOAPAction", "\"" + xmlNs + (xmlNs.EndsWith("/") ? "" : "/") + methodName + "\"");            // 设置请求身份            SetWebRequest(request);            // 获取soap协议            byte[] data = EncodeParsToSoap(pars, xmlNs, methodName);            // 将soap协议写入请求            WriteRequestData(request, data);            XmlDocument returnDoc = new XmlDocument();            XmlDocument retrunValueDoc = new XmlDocument();            // 读取服务端响应            returnDoc = ReadXmlResponse(request.GetResponse());            XmlNamespaceManager mgr = new XmlNamespaceManager(returnDoc.NameTable);            mgr.AddNamespace("soap", "http://schemas.xmlsoap.org/soap/envelope/");            // 返回结果            return returnDoc.SelectSingleNode("//soap:Body/*/return", mgr).InnerXml;        }        /// <summary>        /// 获取wsdl中的名字空间        /// </summary>        /// <param name="url"> wsdl地址</param>        /// <returns> 名字空间</returns>        private string GetNamespace(String url)        {            // 创建wsdl请求对象，并从中读取名字空间            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url + "?WSDL");            SetWebRequest(request);            WebResponse response = request.GetResponse();            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);            XmlDocument doc = new XmlDocument();            doc.LoadXml(sr.ReadToEnd());            sr.Close();            return doc.SelectSingleNode("//@targetNamespace").Value;        }        /// <summary>        /// 加入soapheader节点        /// </summary>        /// <param name="doc"> soap文档</param>        private void InitSoapHeader(XmlDocument doc)        {            // 添加soapheader节点            XmlElement soapHeader = doc.CreateElement("soap", "Header", "http://schemas.xmlsoap.org/soap/envelope/");            XmlElement soapId = doc.CreateElement("userid");            soapId.InnerText = ID;            XmlElement soapPwd = doc.CreateElement("userpwd");            soapPwd.InnerText = PWD;            soapHeader.AppendChild(soapId);            soapHeader.AppendChild(soapPwd);            doc.ChildNodes[0].AppendChild(soapHeader);        }        /// <summary>        /// 将以字节数组的形式返回soap协议        /// </summary>        /// <param name="pars"> 参数表</param>        /// <param name="xmlNs"> 名字空间</param>        /// <param name="methodName"> 方法名</param>        /// <returns> 字节数组</returns>        private byte[] EncodeParsToSoap(Hashtable pars, String xmlNs, String methodName)        {            XmlDocument doc = new XmlDocument();            // 构建soap文档            doc.LoadXml("<soap:Envelope xmlns:xsi=\"http://www.w3.org/2001/XMLSchema-instance/\" xmlns:xsd=\"http://www.w3.org/2001/XMLSchema\" xmlns:soap=\"http://schemas.xmlsoap.org/soap/envelope/\"></soap:Envelope>");            // 加入soapbody节点            InitSoapHeader(doc);            // 创建soapbody节点            XmlElement soapBody = doc.CreateElement("soap", "Body", "http://schemas.xmlsoap.org/soap/envelope/");            // 根据要调用的方法创建一个方法节点            XmlElement soapMethod = doc.CreateElement(methodName);            soapMethod.SetAttribute("xmlns", xmlNs);            // 遍历参数表中的参数键            foreach (string key in pars.Keys)            {                // 根据参数表中的键值对，生成一个参数节点，并加入方法节点内                XmlElement soapPar = doc.CreateElement(key);                soapPar.InnerXml = ObjectToSoapXml(pars[key]);                soapMethod.AppendChild(soapPar);            }            // soapbody节点中加入方法节点            soapBody.AppendChild(soapMethod);            // soap文档中加入soapbody节点            doc.DocumentElement.AppendChild(soapBody);            // 添加声明            AddDelaration(doc);            // 以字节数组的形式返回soap文档            return Encoding.UTF8.GetBytes(doc.OuterXml);        }        /// <summary>        /// 将参数对象中的内容取出        /// </summary>        /// <param name="o">参数值对象</param>        /// <returns>字符型值对象</returns>        private string ObjectToSoapXml(object o)        {            XmlSerializer mySerializer = new XmlSerializer(o.GetType());            MemoryStream ms = new MemoryStream();            mySerializer.Serialize(ms, o);            XmlDocument doc = new XmlDocument();            doc.LoadXml(Encoding.UTF8.GetString(ms.ToArray()));            if (doc.DocumentElement != null)            {                return doc.DocumentElement.InnerXml;            }            else            {                return o.ToString();            }        }        /// <summary>        /// 设置请求身份        /// </summary>        /// <param name="request"> 请求</param>        private void SetWebRequest(HttpWebRequest request)        {            request.Credentials = CredentialCache.DefaultCredentials;            //request.Timeout = 10000;        }        /// <summary>        /// 将soap协议写入请求        /// </summary>        /// <param name="request"> 请求</param>        /// <param name="data"> soap协议</param>        private void WriteRequestData(HttpWebRequest request, byte[] data)        {            request.ContentLength = data.Length;            Stream writer = request.GetRequestStream();            writer.Write(data, 0, data.Length);            writer.Close();        }        /// <summary>        /// 将响应对象读取为xml对象        /// </summary>        /// <param name="response"> 响应对象</param>        /// <returns> xml对象</returns>        private XmlDocument ReadXmlResponse(WebResponse response)        {            StreamReader sr = new StreamReader(response.GetResponseStream(), Encoding.UTF8);            String retXml = sr.ReadToEnd();            sr.Close();            XmlDocument doc = new XmlDocument();            doc.LoadXml(retXml);            return doc;        }        /// <summary>        /// 给xml文档添加声明        /// </summary>        /// <param name="doc"> xml文档</param>        private void AddDelaration(XmlDocument doc)        {            XmlDeclaration decl = doc.CreateXmlDeclaration("1.0", "utf-8", null);            doc.InsertBefore(decl, doc.DocumentElement);        }    }}

调用的时候

                Hashtable pars = new Hashtable();                String Url = @"http://localhost:8080/TsbWebService/Tsb";                WebServiceCaller wsCaller = new WebServiceCaller("xxx", "xxx");                string strParam = "参数字符串";                 pars.Add("strParams", strParam);                string strReturnValue = wsCaller.QuerySoapWebService(Url, "GetCourseInfoFromTSB", pars);