用C#通过反射实现动态调用WebService告别Web引用

using System;using System.Collections.Generic;using System.Text;using System.Net;using System.IO;using System.Web.Services.Description;using System.CodeDom;using Microsoft.CSharp;using System.CodeDom.Compiler;namespace TestCommon{    public class Webservice    {        /// <summary>        /// 实例化WebServices        /// </summary>        /// <param name="url">WebServices地址</param>        /// <param name="methodname">调用的方法</param>        /// <param name="args">把webservices里需要的参数按顺序放到这个object[]里</param>        public static object InvokeWebService(string url, string methodname, object[] args)        {            //这里的namespace是需引用的webservices的命名空间，我没有改过，也可以使用。也可以加一个参数从外面传进来。            string @namespace = "client";            try            {                //获取WSDL                WebClient wc = new WebClient();                Stream stream = wc.OpenRead(url + "?WSDL");                ServiceDescription sd = ServiceDescription.Read(stream);                string classname = sd.Services[0].Name;                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 csc = new CSharpCodeProvider();                //ICodeCompiler icc = csc.CreateCompiler();                //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 = csc.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);            }            catch            {                return null;            }        }    }}