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; } } }