C# Attribute - DotNET | Tianciの小窝

# Remark 特性的应用场景

	UserState userState = UserState.Normal;
	switch (userState)
	{
	case UserState.Deleted:
	Console.WriteLine("删除");
	break;

	case UserState.Normal:
	Console.WriteLine("正常");
	break;

	case UserState.Frozen:
	Console.WriteLine("冻结");
	break;
	}

	/// <summary>
	/// Remark 特性
	/// </summary>
	public class RemarkAttribute : Attribute
	{
	private string _Remark;

	/// <summary>
	/// 有参构造函数
	/// </summary>
	/// <param name="remark"></param>
	public RemarkAttribute(string remark)
	{
	_Remark = remark;
	}

	/// <summary>
	/// 获取 Remark
	/// </summary>
	/// <returns></returns>
	public string GetRemark()
	{
	return _Remark;
	}
	}

	public static class RemarkExtension
	{
	/// <summary>
	/// Enum 的扩展方法
	/// </summary>
	/// <param name="value"></param>
	/// <returns></returns>
	public static string GetRemark(this Enum value)
	{
	// 获取类型
	Type type = value.GetType();

	// 获取字段
	FieldInfo fieId = type.GetField(value.ToString());

	// 判断字段上面是否定义了 ReamrkAttribute 特性
	if (fieId.IsDefined(typeof(RemarkAttribute)))
	{
	// 创建实例
	RemarkAttribute attribute = (RemarkAttribute)fieId.GetCustomAttribute(typeof(RemarkAttribute));

	return attribute.GetRemark();
	}
	else
	{
	return value.ToString();
	}
	}
	}

	static void Main(string[] args)
	{
	UserState userState = UserState.Normal;
	Console.WriteLine(userState.GetRemark());
	Console.ReadKey();
	}

输出结果

技术