/// <summary>
 /// 数据状态枚举
 /// </summary>
 [Flags]
 [DataContract]
 [EnumDescription("状态")]
 public enum StatesFlags
 {
  /// <summary>
  /// 可用状态
  /// </summary>
  [XmlEnum("1")]
  [EnumDescription("可用")]
  [EnumMember]
  Enabled = 1,
  /// <summary>
  /// 停用状态
  /// </summary>
  [XmlEnum("2")]
  [EnumDescription("停用")]
  [EnumMember]
  Disabled = 1 << 1,
  /// <summary>
  /// 移除（相当于逻辑删除）
  /// </summary>
  [XmlEnum("4")]
  [EnumDescription("移除")]
  [EnumMember]
  Removed = 1 << 2,
  /// <summary>
  /// 已确认（已经审核通过）
  /// </summary>
  [XmlEnum("8")]
  [EnumDescription("已确认")]
  [EnumMember]
  Confirmed = 1 << 3,
  /// <summary>
  /// 锁定
  /// </summary>
  [XmlEnum("16")]
  [EnumDescription("锁定")]
  [EnumMember]
  Locked = 1 << 4,
  /// <summary>
  /// 锁定登录
  /// </summary>
  [XmlEnum("32")]
  [EnumDescription("锁定登录")]
  [EnumMember]
  LockLogin = 1 << 5
 }

///<sumary>
  /// 状态集，写
  ///</sumary>
  public StatesFlags States { get; set; }
  /// <summary>
  /// 只读
  /// </summary>
  public bool IsRemoved => States.HasFlag(StatesFlags.Removed);

/// <summary>
 /// 数据状态枚举
 /// </summary>
 public static class StatesFlagsExtends
 {
  /// <summary>
  /// 设置可用
  /// </summary>
  /// <param name="states">状态</param>
  public static StatesFlags SetEnable(this StatesFlags states)
  {
   if (states.HasFlag(StatesFlags.Disabled)) states = states ^ StatesFlags.Disabled;
   if (!states.HasFlag(StatesFlags.Enabled)) states = states | StatesFlags.Enabled;
   return states;
  }
  /// <summary>
  /// 设置停用
  /// </summary>
  /// <param name="states">状态</param>
  public static StatesFlags SetDisable(this StatesFlags states)
  {
   if (states.HasFlag(StatesFlags.Enabled)) states = states ^ StatesFlags.Enabled;
   if (!states.HasFlag(StatesFlags.Disabled)) states = states | StatesFlags.Disabled;
   return states;
  }
  /// <summary>
  /// 移除状态
  /// </summary>
  /// <param name="states">状态</param>
  /// <param name="state">要移除的状态</param>
  public static StatesFlags RemoveState(this StatesFlags states, StatesFlags state)
  {
   //也可以通过如下计算去除一个状态states = states & ~StatesFlags.Disabled;
   return states ^ state;
  }
  /// <summary>
  /// 附加状态
  /// </summary>
  /// <param name="states">状态</param>
  /// <param name="state">要附加的状态</param>
  public static StatesFlags AttachState(this StatesFlags states, StatesFlags state)
  {
   return states | state;
  }

 }

[TestClass]
 public class StatesFlagsTest
 {
  [TestMethod]
  public void TestStatesExtends()
  {
   //赋初值 在用、锁定、移除
   var state = StatesFlags.Enabled | StatesFlags.Locked | StatesFlags.Removed;
   //调用SetDisable方法，设为停用
   state = state.SetDisable();
   Assert.IsTrue(!state.HasFlag(StatesFlags.Enabled));
   Assert.IsTrue(state.HasFlag(StatesFlags.Disabled));
   //调用SetEnable方法，设为在用
   state = state.SetEnable();
   Assert.IsTrue(state.HasFlag(StatesFlags.Enabled));
   Assert.IsTrue(!state.HasFlag(StatesFlags.Disabled));
   //调用RemoveState方法，移除状态
   state = state.RemoveState(StatesFlags.Locked);
   Assert.IsTrue(!state.HasFlag(StatesFlags.Locked));
   Assert.IsTrue(state.HasFlag(StatesFlags.Removed));
   //调用AttachState方法，附加状态
   state = state.AttachState(StatesFlags.Confirmed);
   Assert.IsTrue(state.HasFlag(StatesFlags.Confirmed));
   //直接调用方法，不赋值不能改变states的值
   state.AttachState(StatesFlags.Locked);
   Assert.IsTrue(!state.HasFlag(StatesFlags.Locked));

  }
 }