using System.Collections.Generic;
using System.Dynamic;
using System.IO;

namespace Common.Utilities
{
    /// <summary>
    /// 动态属性Bag
    /// </summary>
    public class DynamicPropertyBag : DynamicObject
    {
        private Dictionary<string, object> storage = new Dictionary<string, object>();

        public override bool TryGetMember(GetMemberBinder binder, out object result)
        {
            if (storage.ContainsKey(binder.Name))
            {
                result = storage[binder.Name];
                return true;
            }
            result = null;
            return false;
        }

        public override bool TrySetMember(SetMemberBinder binder, object value)
        {
            string key = binder.Name;
            if (storage.ContainsKey(key))
                storage[key] = value;
            else
                storage.Add(key, value);
            return true;
        }

        public override string ToString()
        {
            StringWriter message = new StringWriter();
            foreach (var item in storage)
                message.WriteLine("{0}:\t{1}", item.Key, item.Value);
            return message.ToString();
        }
    }
}