动态调用WebService的实现方法

   /// <summary>
        /// 动态调用web服务
        /// </summary>
        /// <param name="url">web服务地址</param>
        /// <param name="classname">类名</param>
        /// <param name="methodname">方法名</param>
        /// <param name="args">参数数组</param>
        /// <returns>返回结果</returns>
        public static object InvokeWebService(string url, string namespaceName, string classname, string methodname, object[] args)
        {
            string @namespace = namespaceName;
            if (namespaceName == null)
            {
                @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
            }
            if ((classname == null) || (classname == ""))
            {
                classname = WebServiceHelper.GetWsClassName(url);
            }
            try
            {
                //返回首次编译的对象
                object instance = GetWebServiceInstance(url, namespaceName, classname, methodname, args);
                System.Reflection.MethodInfo m = instance.GetType().GetMethod(methodname);
                return m.Invoke(instance, args);

                //获取WSDL
                WebClient wc = new WebClient();
                Stream stream = wc.OpenRead(url + "?WSDL");
                ServiceDescription sd = ServiceDescription.Read(stream);

                ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
                sdi.AddServiceDescription(sd, "", "");
                CodeNamespace cn = new CodeNamespace(@namespace);

                //生成客户端代理类代码
                CodeCompileUnit ccu = new CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);
                CSharpCodeProvider csc = new CSharpCodeProvider();
                ICodeCompiler icc = csc.CreateCompiler();

                //设定编译参数
                CompilerParameters cplist = new CompilerParameters();
                cplist.GenerateExecutable = false;
                cplist.GenerateInMemory = true;
                cplist.ReferencedAssemblies.Add("System.dll");
                cplist.ReferencedAssemblies.Add("System.XML.dll");
                cplist.ReferencedAssemblies.Add("System.Web.Services.dll");
                cplist.ReferencedAssemblies.Add("System.Data.dll");
                //编译代理类
                CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
                if (true == cr.Errors.HasErrors)
                {
                    System.Text.StringBuilder sb = new System.Text.StringBuilder();
                    foreach (System.CodeDom.Compiler.CompilerError ce in cr.Errors)
                    {
                        sb.Append(ce.ToString());
                        sb.Append(System.Environment.NewLine);
                    }
                    throw new Exception(sb.ToString());