C# 动态调用webservice

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 TestClient
{
    public static class WebServiceHelper
    {
        ///   <summary>   
        ///   根据指定的信息，调用远程WebService方法   
        ///   </summary>   
        ///   <param   name="url">WebService的http形式的地址</param>   
        ///   <param   name="namespace">欲调用的WebService的命名空间</param>   
        ///   <param   name="classname">欲调用的WebService的类名（不包括命名空间前缀）</param>   
        ///   <param   name="methodname">欲调用的WebService的方法名</param>   
        ///   <param   name="args">参数列表</param>   
        ///   <returns>WebService的执行结果</returns>   
        ///   <remarks>   
        ///   如果调用失败，将会抛出Exception。请调用的时候，适当截获异常。   
        ///   异常信息可能会发生在两个地方：   
        ///   1、动态构造WebService的时候，CompileAssembly失败。   
        ///   2、WebService本身执行失败。 
        public static byte[] InvokeWebservice(string url, string @namespace, string classname, string methodname, object[] args)
        {

            try
            {
                System.Net.WebClient wc = new System.Net.WebClient();
                System.IO.Stream stream = wc.OpenRead(url + "?WSDL");
                System.Web.Services.Description.ServiceDescription sd = System.Web.Services.Description.ServiceDescription.Read(stream);
                System.Web.Services.Description.ServiceDescriptionImporter sdi = new System.Web.Services.Description.ServiceDescriptionImporter();
                sdi.AddServiceDescription(sd, "", "");
                System.CodeDom.CodeNamespace cn = new System.CodeDom.CodeNamespace(@namespace);
                System.CodeDom.CodeCompileUnit ccu = new System.CodeDom.CodeCompileUnit();
                ccu.Namespaces.Add(cn);
                sdi.Import(cn, ccu);

                Microsoft.CSharp.CSharpCodeProvider csc = new Microsoft.CSharp.CSharpCodeProvider();
                System.CodeDom.Compiler.ICodeCompiler icc = csc.CreateCompiler();

                System.CodeDom.Compiler.CompilerParameters cplist = new System.CodeDom.Compiler.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");

                System.CodeDom.Compiler.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());
                }
                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);

               //注：method.Invoke(o, null)返回的是一个Object,如果你服务端返回的是DataSet,这里也是用(DataSet)method.Invoke(o, null)转一下就行了
                return (byte[])mi.Invoke(obj, args);
            }
            catch (Exception ex)
            {
                throw new Exception(ex.InnerException.Message, new Exception(ex.InnerException.StackTrace));
            }
        }  
    }
}

　　调用方法：

      byte[] test = WebServiceHelper.InvokeWebservice(url, ServiceName, ServiceClassName, ServiceMethod, new object[] { 参数});