DataSet產生XML檔案

 [WebMethod(Description="這是一個WebService方法")]  public XmlDataDocument GetSiteAData(string AssignName)  {   XmlDataDocument xd=new XmlDataDocument(); //   DataSet ds=new DataSet();   CStoreProc cp=new CStoreProc("SearchAssign");   cp.AddParIn("@keywords",SqlDbType.VarChar,30,AssignName);   cp.AddParOut("@res",SqlDbType.Int);   if(cp.SelectProc()) //如果執行成功,預存程序   {    cp.myData.EnforceConstraints=false; //不進行格式嚴格檢查    if((int)cp.GetReturnValue("@res")==-1)    {     string xml="<NewDataSet></NewDataSet>";     xd.LoadXml(xml);     return xd;    }    xd=new XmlDataDocument(cp.myData);    XmlNode root1=xd.DocumentElement;     XmlNodeList roots=root1.SelectNodes("list");       foreach(XmlNode roota in  roots)  //為所有元素加上網站名稱標記   {     XmlElement Link=xd.CreateElement("SiteName");      Link.InnerText=ConfigurationSettings.AppSettings["SiteName"].ToString();     roota.AppendChild(Link);    }    return xd;   }   else return null;  }