.NET 配置文件自定义

 代码：       

/// <summary>    /// 企业信息配置节    /// </summary>    public class CompanySetting : ConfigurationSection    {        [ConfigurationProperty("companylist", IsDefaultCollection = false)]        [ConfigurationCollection(typeof(CompanyInfoCollection),            AddItemName = "add",            ClearItemsName = "clear",            RemoveItemName = "remove")]        public CompanyInfoCollection CompanyList        {            get            {                CompanyInfoCollection urlsCollection = (CompanyInfoCollection)base["companylist"];                return urlsCollection;            }        }    }     public class CompanyInfoCollection : ConfigurationElementCollection    {        public CompanyInfoCollection()        {            CompanyInfoElement companyInfo = (CompanyInfoElement)CreateNewElement();            Add(companyInfo);        }         public override ConfigurationElementCollectionType CollectionType        {            get            {                return ConfigurationElementCollectionType.AddRemoveClearMap;            }        }         protected override ConfigurationElement CreateNewElement()        {            return new CompanyInfoElement();        }         protected override Object GetElementKey(ConfigurationElement element)        {            return ((CompanyInfoElement)element).UserName;        }         public CompanyInfoElement this[int index]        {            get            {                return (CompanyInfoElement)BaseGet(index);            }            set            {                if (BaseGet(index) != null)                {                    BaseRemoveAt(index);                }                BaseAdd(index, value);            }        }         new public CompanyInfoElement this[string userName]        {            get            {                return (CompanyInfoElement)BaseGet(userName);            }        }         public int IndexOf(CompanyInfoElement userName)        {            return BaseIndexOf(userName);        }         public void Add(CompanyInfoElement userName)        {            BaseAdd(userName);        }        protected override void BaseAdd(ConfigurationElement element)        {            BaseAdd(element, false);        }         public void Remove(CompanyInfoElement url)        {            if (BaseIndexOf(url) >= 0)                BaseRemove(url.UserName);        }         public void RemoveAt(int index)        {            BaseRemoveAt(index);        }         public void Remove(string userName)        {            BaseRemove(userName);        }         public void Clear()        {            BaseClear();        }    }      /// <summary>    /// 企业信息    /// </summary>    public class CompanyInfoElement : ConfigurationElement    {        /// <summary>        /// 企业名称        /// </summary>        [ConfigurationProperty("companyname", IsRequired = true)]        public string CompanyName        {            get { return this["companyname"].ToString(); }            set { this["companyname"] = value; }        }         /// <summary>        /// 用户名称        /// </summary>        [ConfigurationProperty("username", IsRequired = true, IsKey = true)]        public string UserName        {            get { return this["username"].ToString(); }            set { this["username"] = value; }        }          /// <summary>        /// 接入码        /// </summary>        [ConfigurationProperty("passcode", IsRequired = true)]        public string PassCode        {            get { return this["passcode"].ToString(); }            set { this["passcode"] = value; }        }          /// <summary>        /// 企业名称        /// </summary>        [ConfigurationProperty("password", IsRequired = true)]        public string Password        {            get { return this["password"].ToString(); }            set { this["password"] = value; }        }         /// <summary>        /// 平台接入码        /// </summary>        [ConfigurationProperty("platpasscode", IsRequired = true)]        public string PlatPassCode        {            get { return this["platpasscode"].ToString(); }            set { this["platpasscode"] = value; }        }         /// <summary>        /// 平台用户名        /// </summary>        [ConfigurationProperty("platusername", IsRequired = true)]        public string PlatUserName        {            get { return this["platusername"].ToString(); }            set { this["platusername"] = value; }        }         /// <summary>        /// 平台密码        /// </summary>        [ConfigurationProperty("platpassword", IsRequired = true)]        public string PlatPassword        {            get { return this["platpassword"].ToString(); }            set { this["platpassword"] = value; }        }         /// <summary>        /// 平台对接IP        /// </summary>        [ConfigurationProperty("platip", IsRequired = true)]        public string PlatIP        {            get { return this["platip"].ToString(); }            set { this["platip"] = value; }        }         /// <summary>        /// 企业名称        /// </summary>        [ConfigurationProperty("platpoint", IsRequired = true)]        public string PlatPoint        {            get { return this["platpoint"].ToString(); }            set { this["platpoint"] = value; }        }
    }
配置项：
  <!--企业信息设置-->  <companySetting>    <!--企业信息-->    <companylist>      <add companyname="浚县顺达公交有限公司" passcode="6011016713" username="210FF3_gj" password="151517" platpasscode="212162134" platusername="HNYB1606212534" platpassword="12534" platip="218.28.140.212" platpoint="10088"/>    </companylist>  </companySetting>

代码：
                var companySetting = (CompanySetting)ConfigurationManager.GetSection("companySetting");
这个地方为什么会读出是两条记录。
                for (int i = 0; i < companySetting.CompanyList.Count; i++)
                {
                    var userName = companySetting.CompanyList[i].UserName;
                    if (String.IsNullOrEmpty(userName))
                        continue;
                    var password = companySetting.CompanyList[i].Password;
                    var passcode = companySetting.CompanyList[i].PassCode;