动态使用webservice,以及含有ref类型的参数的问题

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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];       }   }<br>//----------------------------------------------------------<br>//参数传递方式<br><br><br><br>        public int ApproveTestReportByHHX(string SeverUrl, int testReportId, string UId, ref string msg)<br>        {<br>            int tem =0;<br><br>            object[] para_arry = new object[3];<br>            para_arry[0] = testReportId;<br>            para_arry[1] = UId;<br>            para_arry[2] = msg;<br><br>            Type[] type_arry = new Type[] { <br>            typeof(int),<br>            typeof(string),<br>            typeof(string).MakeByRefType()<br>            };<br>            tem =(bool) WSHelper.InvokeWebService(SeverUrl, "ApproveReportByHHX", para_arry, type_arry)?1:0;<br>            //Ogcis_Server.ExcelAddInsSoapClient soap = new Ogcis_Server.ExcelAddInsSoapClient();<br>            //tem = soap.ApproveReportByHHX(testReportId, UId, ref msg);<br>            msg=para_arry[2].ToString();<br>            return tem;<br>        }