/// <summary>

        /// 将实体类存入config

        /// </summary>

        /// <param name="enity"></param>

        public void SetValue<T>(T enity) where T : class

        {

            System.Xml.XmlDocument xDoc = new System.Xml.XmlDocument();

            xDoc.Load(HttpContext.Current.Server.MapPath("~/xxxx.config"));

            System.Xml.XmlNode xNode;

            System.Xml.XmlElement xElem1;

            System.Xml.XmlElement xElem2;

            xNode = xDoc.SelectSingleNode("//appSettings");

            System.Reflection.PropertyInfo[] properties = enity.GetType().GetProperties(System.Reflection.BindingFlags.Instance | System.Reflection.BindingFlags.Public);

            foreach (System.Reflection.PropertyInfo item in properties)

            {

                string name = item.Name;

                string value = (string)item.GetValue(enity, null);

                if (item.PropertyType.IsValueType || item.PropertyType.Name.StartsWith("String"))

                {

                    xElem1 = (System.Xml.XmlElement)xNode.SelectSingleNode("//add[@key='" + name + "']");

                    if (xElem1 != null) xElem1.SetAttribute("value", value);

                    else

                    {

                        xElem2 = xDoc.CreateElement("add");

                        xElem2.SetAttribute("key", name);

                        xElem2.SetAttribute("value", value);

                        xNode.AppendChild(xElem2);

                    }

                }

            }

            xDoc.Save(HttpContext.Current.Server.MapPath("~/xxxx.config"));

        }