public static class WebServiceHelper
    {
        /// <summary>  
        /// 動態呼叫WebService  
        /// </summary>  
        /// <param name="url">WebService地址</param>  
        /// <param name="methodname">方法名(模組名)</param>  
        /// <param name="args">引數列表,無引數為null</param>
 
  
        /// <returns>object</returns>  
        public static object InvokeWebService(string url, string methodname, object[] args)
        {
            return InvokeWebService(url, null, methodname, args);
        }
        /// <summary>  
        /// 動態呼叫WebService  
        /// </summary>
 
  
        /// <param name="url">WebService地址</param>  
        /// <param name="classname">類名</param>  
        /// <param name="methodname">方法名(模組名)</param>  
        /// <param name="args">引數列表</param>  
        /// <returns>object</returns>  
        public
 
 static object InvokeWebService(string url, string classname, string methodname, object[] args)
        {
            try
            {
                string @namespace = "WebService.webservice";
                if (classname == null || classname == "")
                {
                    classname = WebServiceHelper.GetClassName(url);
                }


                WebClient wc = new WebClient();
                Stream stream = wc.OpenRead(url + "?WSDL");   //獲取服務描述語言(WSDL)  
                System.Web.Services.Description.ServiceDescription sd = System.Web.Services.Description.ServiceDescription.Read(stream);    //通過直接從 Stream例項載入 XML 來初始化ServiceDescription類的例項。  
                ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();

                sdi.AddServiceDescription(sd, "", "");
                CodeNamespace cn = new CodeNamespace(@namespace);  //CodeNamespace表示名稱空間宣告。  
                                                                   //生成客戶端代理類程式碼  
                CodeCompileUnit ccu = new CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);
                CSharpCodeProvider csc = new CSharpCodeProvider();

                ICodeCompiler icc = csc.CreateCompiler();//取得C#程式碼編譯器的執行個體  

                //設定編譯器的引數  
                CompilerParameters cplist = new CompilerParameters();//建立編譯器的引數例項  
                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");
                //編譯代理類  
                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());
                }

                //生成代理例項,並呼叫方法  
                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 的例項可以通過呼叫GetMethods或者Type物件或派生自Type的物件的GetMethod方法來獲取，還可以通過呼叫表示泛型方法定義的 MethodInfo 的MakeGenericMethod方法來獲取。  
                return mi.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                PubCommon.WriteLog("WebService呼叫失敗:" + ex.Message);
            }
            return null;

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

呼叫方法：

object[] ob = new object[] { UnitId, User, Pwd, Phone, Email, sysList.Split(','), Scenic.Split(','), "Manager" };

                string result = Convert.ToString(WebServiceHelper.InvokeWebService(LoginWebServices, methodName1, ob));

LoginWebServices：webservice地址
methodName1：方法名
ob：引數