利用正则表达式将html网页数据变成Web Service[3]

        
        //required by the web services designer
        private icontainer components = null;
                
        /// <summary>
        /// required method for designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void initializecomponent()
        {
        }

        /// <summary>
        /// clean up any resources being used.
        /// </summary>
        protected override void dispose( bool disposing )
        {
            if(disposing && components != null)
            {
                components.dispose();
            }
            base.dispose(disposing);        
        }
        
        #endregion

        [webmethod]
        public xmldatadocument getforeignexchangerates()
        {
            return getxmldoc();
        }
        [webmethod]
        public dataset getforeignexchangeratesdataset()
        {
            return getxmldoc().dataset;
        }
        [webmethod]
        public string getbankpage()
        {
            return getwebcontent( "http://www.bank-of-china.com/info/whjrpj.html" );
        }
        //    private methods
        private string getwebcontent( string url )
        {