如何让WebServer返回指的定XML内容

通过创建WEBServer代理可以当作本地类使用，但能不能返回指定的XML呢？
比如通过checkpass服务检测帐号和密码之后要返回该用户拥有的权限列表。怎么实现呢？

研究中........

请各大侠指点

asp_net高级编程928页19.4.2 数据类型

　　ASP.NET Web服务支持在公共语言运行时中支持的所有基本数据类型,包括String,integer,Long等等。除了简单的基本数据类型之外，还支持基本数据类型的数组。

　　但是，更有趣的是支持用户定义的类和结构体。基本上，任何可由ＸＳＤ模式代表的类型都是可以作为ASP.NET的参数或返回类型。

 asp_net 高级编程946页 19.7.1控制并整理xml

　　通过一个星期的摸索，解决了这个问题，并学习了如何读取和输出XML文档；数据库操作；WebServer的创建和引用。下面就部分源码供初学习者参考，不足之此请指正。

/*CheckLogin服务*/ using System; using System.Web; using System.Collections; using System.Web.Services; using System.Web.Services.Protocols; using System.Configuration; using System.Data; using System.Data.SqlClient; using mysql.SQL; using myfunc.Common; /// <summary> /// CheckLogin 的摘要说明 /// </summary> [WebService(Namespace = "http://localhost/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class CheckLogin : System.Web.Services.WebService {     public CheckLogin () {         //如果使用设计的组件，请取消注释以下行         //InitializeComponent();     }     //[WebMethod(Description = "Login", EnableSession = true)]     [WebMethod]     public checkuser Login(string sUserCode, string sPassword)     {         checkuser objcheckuser= new checkuser();         string sCheckLogin = ConfigurationManager.AppSettings["strCheckLogin"];         SqlShell objShell = new SqlShell();         SqlCommand objCommand = new SqlCommand(sCheckLogin);         objCommand.CommandType = CommandType.Text;         objCommand.Parameters.AddWithValue("@sUserCode", sUserCode);         objCommand.Parameters.AddWithValue("@sPassword", sPassword);         DataTable objDataTable = objShell.executeDataSet(ref objCommand).Tables[0];         objcheckuser.logined = (objDataTable.Rows.Count > 0);         if (objcheckuser.logined)         {             //帐号和密码正确,反回帐号信息             DataRow objDataRow = objDataTable.Rows[0];             objcheckuser.userid = objDataRow["UserID"].ToString().Trim(); ;             objcheckuser.pass = objDataRow["Pass"].ToString().Trim();             objcheckuser.username = objDataRow["UserName"].ToString().Trim();             //检查Allow字段是否为空             if (objDataRow.IsNull("Allow")) { objcheckuser.allow = ""; }             else { objcheckuser.allow = objDataRow["Allow"].ToString().Trim(); }             menulist objmenulist = new menulist(objDataRow["UserID"].ToString().Trim());             objcheckuser.menuxml = objmenulist.buf;//返回菜单列表的XML字符串                           }         return objcheckuser;     }     public class checkuser     {         public bool logined;         public string userid;         public string pass;         public string username;         public string allow;         public string menuxml;//返回菜单列表的XML字符串     } } /*CheckLogin服务结束*/

/*menulist 类开始*/ using System; using System.Data; using System.Configuration; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using System.Xml; using Singcn.SQL; using System.Data.SqlClient; using System.IO; using System.Text; namespace myfunc.Common {     /// <summary>     /// PubFunc 的摘要说明     /// </summary>     public class menulist     {         public XmlWriterSettings settings = new XmlWriterSettings();         public XmlWriter writer = null;         public string buf = "";         public SqlShell objShell;         public SqlCommand objCommand;         public DataTable objDataTable;         public menulist(string userid)         {             objShell = new SqlShell();             objCommand = new SqlCommand("select * from qxdmb order by jb,px,qxdm");             objCommand.CommandType = CommandType.Text;             objDataTable = objShell.executeDataSet(ref objCommand).Tables[0];             StringWriter writerstr = new StringWriter();             settings.Indent = true;             settings.Encoding = Encoding.GetEncoding("utf-8");             try             {                 writer = XmlWriter.Create(writerstr, settings);                 writer.WriteStartDocument();                 writer.WriteStartElement("DSTreeRoot");                 writer.WriteAttributeString("text", "后台管理系统-["+userid+"]");                 writer.WriteAttributeString("treeId", "0000");                 writer.WriteAttributeString("open", "true");                                   readqxdmb("0");                 writer.WriteEndElement();                 writer.WriteEndDocument();             }             finally             {                 if (writer != null)                     writer.Close();             }             buf = writerstr.ToString();             buf = buf.Replace(@"encoding=""utf-16""", @"encoding=""utf-8""");//在使用StringWriter 作为xml输出时XML自动为“utf-16”，此处用Replace方法处理，如有更好的方法请指教！         }         private void readqxdmb(string sjdm)//生成XML树的方法         {             DataTable mytable = objDataTable.Copy();             DataRow[] foundRows;             foundRows = mytable.Select("sjdm='" + sjdm + "'");             if (foundRows.Length > 0)             {                 //写子节点                 for (int i = 0; i < foundRows.Length; i++)                 {                     writer.WriteStartElement("DSTree");                     writer.WriteAttributeString("text", foundRows[i]["qxsm"].ToString().Trim());                     writer.WriteAttributeString("treeId", foundRows[i]["qxdm"].ToString().Trim());                     writer.WriteAttributeString("open", "false");                     //处理下级节点                     readqxdmb((string)foundRows[i]["qxdm"]);                     writer.WriteEndElement();                 }             }             mytable.Dispose();         }     } } /*menulist 结束*/

/*引用开始 */ using System; using System.Data; using System.Configuration; using System.Collections; using System.Web; using System.Web.Security; using System.Web.UI; using System.Web.UI.WebControls; using System.Web.UI.WebControls.WebParts; using System.Web.UI.HtmlControls; using localhost; public partial class _Default : System.Web.UI.Page {     protected void Page_Load(object sender, EventArgs e)     {     }     protected void Button1_Click(object sender, EventArgs e)     {         CheckLogin objCheckLogin=new CheckLogin();         CheckLogin.checkuser objcheckuser = new CheckLogin.checkuser();         objcheckuser=objCheckLogin.Login(TextBox1.Text, TextBox2.Text);         if (objcheckuser.logined) Label1.Text = objcheckuser.userid;         else Label1.Text = "false";     } } /*引用结束*/