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

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,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,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,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);
        }
    }
}

                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);