C# 动态访问webserver 帮助类

 /* 调用方式   
         *   string url = "http://www.webservicex.net/globalweather.asmx" ;   
         *   string[] args = new string[2] ;   
         *   args[0] = "Hangzhou";   
         *   args[1] = "China" ;   
         *   object result = WebServiceHelper.InvokeWebService(url ,"GetWeather" ,args) ;   
         *   Response.Write(result.ToString());   
         */
        public class WebServiceHelper
        {
            #region InvokeWebService
            /// < 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)
            {
                return WebServiceHelper.InvokeWebService(url, null, methodname, args);
            }

            /// < 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)
            {
                string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
                if ((classname == null) || (classname == ""))
                {
                    classname = WebServiceHelper.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());
                    }

                    //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);

                    return mi.Invoke(obj, args);

                    /*   
                    PropertyInfo propertyInfo = type.GetProperty(propertyname);   
                    return propertyInfo.GetValue(obj, null);   
                    */
                }
                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];
            }
            #endregion
        }