c# 动态调用 WebService

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 = "NameSpace";
            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];
        }
    }

注：在传递参数是可能会出现参数计数不匹配的错误，在invoke时，这样传参： new object[] { new object[] { para1,para2 } }。