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)
        {
            return WSHelper.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 = 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());
                }
                //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];
        }
    }

运行到:sdi.Import(cn, ccu);报错

{System.ArgumentException: 找不到 http://workflow.topcheer.com/:ISystemStatusService 的定义。缺少命名空间为 http://workflow.topcheer.com/ 的服务说明。
参数名: name
   在 System.Web.Services.Description.ServiceDescriptionCollection.GetServiceDescription(XmlQualifiedName name)
   在 System.Web.Services.Description.ServiceDescriptionCollection.GetPortType(XmlQualifiedName name)
   在 System.Web.Services.Description.ProtocolImporter.GenerateCode(CodeNamespace codeNamespace, ImportContext importContext, Hashtable exportContext)
   在 System.Web.Services.Description.ServiceDescriptionImporter.Import(CodeNamespace codeNamespace, ImportContext importContext, Hashtable exportContext, StringCollection warnings)
   在 System.Web.Services.Description.ServiceDescriptionImporter.Import(CodeNamespace codeNamespace, CodeCompileUnit codeCompileUnit)
   在 TestLibrary.WSHelper.InvokeWebService(String url, String classname, String methodname, Object[] args) 位置 c:\资料\SPDB.WFSDK\TestLibrary\WSHelper.cs:行号 55}

调用:

string url = "http://XX.XXX.XX.XXX:8094/SystemStatusService";
            string[] args = new string[1];
            args[0] = "CC-FEAPS";
            object result = TestLibrary.WSHelper.InvokeWebService(url, "QuerySystemStatus", args);

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