public static string TestService(string strurl, string methodname)
    {
        System.Net.WebClient client = new System.Net.WebClient();
        String url = "" + strurl + "?WSDL";
        System.IO.Stream stream = client.OpenRead(url);
        System.Web.Services.Description.ServiceDescription description = System.Web.Services.Description.ServiceDescription.Read(stream);

        System.Web.Services.Description.ServiceDescriptionImporter importer = new System.Web.Services.Description.ServiceDescriptionImporter();//创建客户端代理代理类。 

        importer.ProtocolName = "Soap"; //指定访问协议。 
        importer.Style = System.Web.Services.Description.ServiceDescriptionImportStyle.Client; //生成客户端代理。 
        importer.CodeGenerationOptions = CodeGenerationOptions.GenerateProperties | CodeGenerationOptions.GenerateNewAsync;

        importer.AddServiceDescription(description, null, null); //添加WSDL文档。 

        CodeNamespace nmspace = new CodeNamespace(); //命名空间 
        nmspace.Name = "TestWebService";
        CodeCompileUnit unit = new CodeCompileUnit();
        unit.Namespaces.Add(nmspace);

        ServiceDescriptionImportWarnings warning = importer.Import(nmspace, unit);
        CodeDomProvider provider = CodeDomProvider.CreateProvider("CSharp");

        CompilerParameters parameter = new CompilerParameters();
        parameter.GenerateExecutable = false;
        parameter.OutputAssembly = "MyTest.dll";//输出程序集的名称 
        parameter.ReferencedAssemblies.Add("System.dll");
        parameter.ReferencedAssemblies.Add("System.XML.dll");
        parameter.ReferencedAssemblies.Add("System.Web.Services.dll");
        parameter.ReferencedAssemblies.Add("System.Data.dll");

        CompilerResults result = provider.CompileAssemblyFromDom(parameter, unit);
        if (result.Errors.HasErrors)
        {
            // 显示编译错误信息 
        }

        Assembly asm = Assembly.LoadFrom("MyTest.dll");//加载前面生成的程序集 
        Type t = asm.GetType("TestWebService.Service1");

        object o = Activator.CreateInstance(t);
        MethodInfo method = t.GetMethod(methodname);//GetPersons是服务端的方法名称,你想调用服务端的什么方法都可以在这里改,最好封装一下 
        //String[] item = (String[])method.Invoke(o, null); 
        //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 
        //foreach (string str in item) 
        //Console.WriteLine(str); 

        //上面是根据WebService地址，模似生成一个代理类,如果你想看看生成的代码文件是什么样子，可以用以下代码保存下来，默认是保存在bin目录下面 
        //TextWriter writer = File.CreateText("MyTest.cs");
        //provider.GenerateCodeFromCompileUnit(unit, writer, null);
        //writer.Flush();
        //writer.Close();

        return method.Invoke(o, null).ToString();
    }