动态使用webservice,以及含有ref类型的参数的问题

  public class WSHelper
    {
        /// < summary>
        /// 动态调用web服务
        /// < /summary>
        /// < param name="url">WSDL服务地址< /param>
        /// < param name="methodname">方法名< /param>
        /// < param name="args">参数< /param>
        /// < returns>< /returns>
        public static object InvokeWebService(string url, string methodname, object[] args, Type[] arrytype)
        {
            return WSHelper.InvokeWebService(url + "/Services/ExcelAddIns.asmx", null, methodname, args, arrytype);
        }
        /// < summary>
        /// 动态调用web服务
        /// < /summary>
        /// < param name="url">WSDL服务地址< /param>
        /// < param name="classname">类名< /param>
        /// < param name="methodname">方法名< /param>
        /// < param name="args">参数< /param>
        /// < returns>< /returns>
        public static object InvokeWebService(string url, string classname, string methodname, object[] args, Type[] arrytype)
        {
            string @namespace = "OGC_Addin.Class";
            if ((classname == null) || (classname == ""))
            {
                classname = WSHelper.GetWsClassName(url);
            }
            try
            {                   //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 icc = new CSharpCodeProvider();
                //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());
                }

                System.Reflection.Assembly assembly = cr.CompiledAssembly;
                Type t = assembly.GetType(@namespace + "." + classname, true, true);
                object obj = Activator.CreateInstance(t);
                System.Reflection.MethodInfo mi;

                if (arrytype.Length > 0)
                {
                    mi = t.GetMethod(methodname, arrytype);
                }
                else
                {
                    mi = t.GetMethod(methodname);
                }

                return mi.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
            }
        }
        private static string GetWsClassName(string wsUrl)
        {
            string[] parts = wsUrl.Split('/');
            string[] pps = parts[parts.Length - 1].Split('.');
            return pps[0];
        }
    }
//----------------------------------------------------------
//参数传递方式

        public int ApproveTestReportByHHX(string SeverUrl, int testReportId, string UId, ref string msg)
        {
            int tem =0;

            object[] para_arry = new object[3];
            para_arry[0] = testReportId;
            para_arry[1] = UId;
            para_arry[2] = msg;

            Type[] type_arry = new Type[] { 
            typeof(int),
            typeof(string),
            typeof(string).MakeByRefType()
            };
            tem =(bool) WSHelper.InvokeWebService(SeverUrl, "ApproveReportByHHX", para_arry, type_arry)?1:0;
            //Ogcis_Server.ExcelAddInsSoapClient soap = new Ogcis_Server.ExcelAddInsSoapClient();
            //tem = soap.ApproveReportByHHX(testReportId, UId, ref msg);
            msg=para_arry[2].ToString();
            return tem;
        }