动态调用Web服务

using System;
using System.Collections.Generic;
using System.Text;
using System.IO;
using System.Net;
using System.Web;
using System.Web.Services.Description;
using System.CodeDom;
using Microsoft.CSharp;
using System.CodeDom.Compiler;
using System.Reflection;

namespace Yom.Framework.Core
{
    public class WebService
    {
        public static object InvokeWebService(string url, string methodName, object[] args)
        {
            return InvokeWebService(url, null, methodName, args);
        }
        public static object InvokeWebService(string url, string className, string methodName, object[] args)
        {

            string @namespace = "EnterpriseServerBase.WebService.DynamicWebCalling";
            if (string.IsNullOrEmpty(className))
            {
                className = GetWsClassName(url);
            }
            try
            {
                WebClient wc = new WebClient();
                Stream stream = wc.OpenRead(string.Format("{0}?WSDL", url));
                ServiceDescription sd = ServiceDescription.Read(stream);
                ServiceDescriptionImporter sdi = new ServiceDescriptionImporter();
                sdi.AddServiceDescription(sd, string.Empty, string.Empty);
                CodeNamespace cn = new CodeNamespace(@namespace);
                CodeCompileUnit ccu = new CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);
                CSharpCodeProvider icc = new CSharpCodeProvider();
                CompilerParameters cplist = new CompilerParameters();
                cplist.GenerateExecutable = false;
                cplist.GenerateInMemory = true;
                cplist.ReferencedAssemblies.AddRange(new string[] { 
                    "System.dll",
                    "System.Xml.dll",
                    "System.Web.Services.dll",
                    "System.Data.dll"
                });
                CompilerResults cr = icc.CompileAssemblyFromDom(cplist, ccu);
                if (cr.Errors.HasErrors)
                {
                    System.Text.StringBuilder sb = new StringBuilder();
                    foreach (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(string.Format("{0}.{1}", @namespace, className), true, true);
                object obj = Activator.CreateInstance(t);
                MethodInfo mi = t.GetMethod(methodName);
                return mi.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
        static string GetWsClassName(string wsURL)
        {
            string[] parts = wsURL.Split('/');
            return parts[parts.Length - 1].Split('.')[0];
        }
    }
}