C#特性(Attribute)示例

[AttributeUsage(AttributeTargets.All,Inherited=false)]
public class TestAttribute : System.Attribute
{
	//Fields
	private string _description;
	
	//Properties
	public string Description
	{
		get { return _description; }
	}
	
	//Constructor
	public TestAttribute(string description)
	{
		this._description = description;
	}
}

[Test("user-defined class")]
public class TestClass
{
	//Constructor
	public TestClass()
	{}
	
	//Methods
	[Test("user-defined method")]
	public int Add(int a, int b)
	{
		return a + b;
	}
}

using System;
using System.Reflection;

namespace Console_Application
{
	class Program
	{
		public static void Main(string[] args)
		{
			Type t = typeof(TestClass);
			MemberInfo memberInfo = t;
			TestAttribute attribute = (TestAttribute)Attribute.GetCustomAttribute(memberInfo,typeof(TestAttribute));
			Console.WriteLine(attribute.Description);
			
			MethodInfo methodInfo = t.GetMethod("Add");
			TestAttribute attribute2 = (TestAttribute)Attribute.GetCustomAttribute(methodInfo,typeof(TestAttribute));
			Console.WriteLine(attribute2.Description);
			
			Console.ReadKey(true);
		}
	}
}