c#自定义属性

using System;
using System.Reflection;
class Program
{
static void Main()
{
System.Attribute[] attrs = Attribute.GetCustomAttributes(typeof(xxx));
foreach (System.Attribute attr in attrs)
{
if (attr is aaa)
{
aaa a = (aaa)attr;
Console.WriteLine("name={0},version={1}",a.Name,a.Version);
}
}
}
}
[aaa("nid",Version=1)]
public class xxx
{
//
}
public class aaa : Attribute
{
public aaa(string name)
{
this.name = name;
}
private string name;
public string Name
{
get { return name; }
set { name = value; }
}
private int version;
public int Version
{
get { return version; }
set { version = value; }
}
}

跑跑感觉一下
自定义属性可以用来标记某个类或方法是否具有某种属性