using System;
using System.Collections.Generic;
using System.Configuration;

namespace WX.CRM.DAL.Redis
{
    public class RedisConfigurationSection : ConfigurationSection
    {
        //private static readonly ConfigurationProperty s_property = new ConfigurationProperty(string.Empty, typeof(RedisSettingsElementCollection), null, ConfigurationPropertyOptions.IsDefaultCollection);
        //[ConfigurationCollection(typeof(RedisSettingsElementCollection), AddItemName = "RedisSettings")]
        [ConfigurationProperty("", IsDefaultCollection = true)]
        public RedisSettingsElementCollection RedisSettings
        {
            get { return (RedisSettingsElementCollection)base[""]; }
        }
        public static RedisConfigurationSection GetSection()
        {
            return ConfigurationManager.GetSection("redis") as RedisConfigurationSection;
        }
    }

    [ConfigurationCollection(typeof(RedisSettingsElement))]
    public class RedisSettingsElementCollection : ConfigurationElementCollection, IEnumerable<RedisSettingsElement>
    {
        public RedisSettingsElementCollection()
            : base(StringComparer.OrdinalIgnoreCase)    // 忽略大小写
        {
        }
        protected override ConfigurationElement CreateNewElement()
        {
            return new RedisSettingsElement();
        }

        protected override object GetElementKey(ConfigurationElement element)
        {
            return ((RedisSettingsElement)element).Name;
        }

        // 其实关键就是这个索引器。但它也是调用基类的实现，只是做下类型转就行了。
        public RedisSettingsElement this[string name]
        {
            get { return (RedisSettingsElement)base.BaseGet(name); }
        }

        public new IEnumerator<RedisSettingsElement> GetEnumerator()
        {
            var e = base.GetEnumerator();
            while (e.MoveNext())
            {
                yield return (RedisSettingsElement)e.Current;
            }
        }
    }
    public class RedisSettingsElement : ConfigurationElement
    {
        [ConfigurationProperty("name")]
        public string Name { get { return (string)base["name"]; } }

        [ConfigurationProperty("connectionString", IsRequired = true)]
        public string ConnectionString { get { return (string)base["connectionString"]; } }

        [ConfigurationProperty("db", DefaultValue = 0)]
        public int Db { get { return (int)base["db"]; } }

    }
}