C#中NameValueCollection类用法 读取配置信息

NameValueCollection允许保存具有相同Key值的数据;  而Dictionary  则不允许这么做，它的Key是具有唯一性的,

 HashTable 是唯一key  无序
Dictionary  是唯一key 但是可以排序
NameValueCollection   key 可以重复

//第一
public NameValueCollection GetConfigKeyValue(string  IPKey)
        {
            var nvc = new NameValueCollection();
            try
            {
                nvc = GetIPConfigKey(IPKey);
                if (nvc == null) 
           {nvc = new NameValueCollection();}

            }
            catch
            {
                nvc = new NameValueCollection();
            }
            return nvc;
        }
//第二
public NameValueCollection GeIPConfigKey(string  IPKey)
        {
            var dt = GetIPConfig(IPKey);
            NameValueCollection  nvc = new NameValueCollection();
            foreach (DataRow dr in dt.Rows)
            {
                nvc [dr["IPName"].ToString()] = dr["IPValue"] as string;
            }
            return nvc ;
        }
//第三
 public DataTable GetIPConfig(string  IPKey)
        {
            var sqlModel= new SqlModel(DBUtility.DBType.Sql)
            {
                ExecuteType = SqlExecuteType.DataTable,
                Sql = @"  select  d.*
                           from Tab_IPDetail d 
                           inner join Tab_IPConfig   c  on d.Configid=c.id 
                           where c.IPKey=@IPKey
                          ",
                DbParameter = new List<System.Data.Common.DbParameter>() 
        {
                    DBHelper.CreateInDbParameter("IPKey", IPKey)
                },
            };
            var result =DBHelper.ExecuteSqlModel<DataTable>(sqlModel);
            return result;
        }