public static class WebServiceInvoker
    {
        /// <summary>
        /// 动态调用WebService
        /// </summary>
        /// <param name="url">WebService地址</param>
        /// <param name="methodname">方法名(模块名)</param>
        /// <param name="args">参数列表,无参数为null</param>
        /// <returns>object</returns>
        public static object InvokeWebService(string url, string methodname, object[] args)
        {
            return InvokeWebService(url, null, methodname, args);
        }
        /// <summary>
        /// 动态调用WebService
        /// </summary>
        /// <param name="url">WebService地址</param>
        /// <param name="classname">类名</param>
        /// <param name="methodname">方法名(模块名)</param>
        /// <param name="args">参数列表</param>
        /// <returns>object</returns>
        public static object InvokeWebService(string url, string classname, string methodname, object[] args)
        {
            string @namespace = "WebService.webservice";
            if (classname == null || classname == "")
            {
                classname = WebServiceInvoker.GetClassName(url);
            }


            WebClient wc = new WebClient();
            Stream stream = wc.OpenRead(url + "?WSDL");   //获取服务描述语言(WSDL)
            ServiceDescription sd = ServiceDescription.Read(stream);    //通过直接从 Stream实例加载 XML 来初始化ServiceDescription类的实例。
            ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();

            sdi.AddServiceDescription(sd, "", "");
            CodeNamespace cn = new CodeNamespace(@namespace);  //CodeNamespace表示命名空间声明。
                                                               //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();//取得C#程式码编译器的执行个体

            //设定编译器的参数
            CompilerParameters cplist = new CompilerParameters();//创建编译器的参数实例
            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 StringBuilder();
                foreach (CompilerError ce in cr.Errors)
                {
                    sb.Append(ce.ToString());
                    sb.Append(System.Environment.NewLine);
                }
                throw new Exception(sb.ToString());
            }

            //生成代理实例,并调用方法
            System.Reflection.Assembly assembly = cr.CompiledAssembly;
            Type t = assembly.GetType(@namespace + "." + classname, true, true);
            object obj = Activator.CreateInstance(t);
            System.Reflection.MethodInfo mi = t.GetMethod(methodname);//MethodInfo 的实例可以通过调用GetMethods或者Type对象或派生自Type的对象的GetMethod方法来获取，还可以通过调用表示泛型方法定义的 MethodInfo 的MakeGenericMethod方法来获取。
            return mi.Invoke(obj, args);

        }
        private static string GetClassName(string url)
        {
            //假如URL为"http://localhost/InvokeService/Service1.asmx"
            //最终的返回值为 Service1
            string[] parts = url.Split('/');
            string[] pps = parts[parts.Length - 1].Split('.');
            return pps[0];
        }
    }

 #region webservice调用示例
            //string url = "http://localhost:31578/TestWebService.asmx";
            //string methodName = "HelloWorld";

            //String result = WebServiceInvoker.InvokeWebService(url, methodName, null).ToString();
            //Console.WriteLine("测试调用本地webService方法结果：" + result);
            #endregion