using System;
using System.Collections.Generic;
using System.Text;

namespace Apewer.Source
{

    /// <summary>表示此属性对应的字段是主键。</summary>
    [AttributeUsage(AttributeTargets.Property)]
    public sealed class PrimaryKeyAttribute : Attribute
    {

        /// <summary>从 <see cref="PrimaryKeyAttribute"/> 到 Boolean 的隐式转换，判断 <see cref="PrimaryKeyAttribute"/> 有效。</summary>
        public static implicit operator bool(PrimaryKeyAttribute instance)
        {
            if (instance == null) return false;
            return true;
        }
    
    }

}