反射获取config实体类属性并赋值

/// <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"));
        }